Author: "Stephan Zimmer" - Searchworks@Jio Institute Digital Library Search Results

Your search keyword '"Stephan Zimmer"' showing total 54 results

Start Over Author "Stephan Zimmer"

54 results on '"Stephan Zimmer"'

1. Visual Amortization Analysis of Recompilation Strategies.

Author: Stephan Zimmer and Stephan Diehl 0001
Published: 2010
Full Text: View/download PDF

2. Extending the Fermi-LAT Data Processing Pipeline to the Grid

Author: Stephan Zimmer, Luisa Arrabito, Tom Glanzman, Tony Johnson, Claudia Lavalley, and Andrei Tsaregorodtsev
Published: 2012

3. A neural network classifier for electron identification on the DAMPE experiment

Author: Francesca Alemanno, Dimitrios Kyratzis, D. Droz, Margherita Di Santo, Enrico Catanzani, Stephan Zimmer, Giovanni Ambrosi, Andrii Tykhonov, and Xin Wu
Subjects: Physics - Instrumentation and Detectors, Proton, Astrophysics::High Energy Astrophysical Phenomena, Dark matter, FOS: Physical sciences, Electron, 7. Clean energy, 01 natural sciences, Particle detector, Particle identification, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Positron, 0103 physical sciences, Cosmic-ray observatory, Instrumentation and Methods for Astrophysics (astro-ph.IM), 010303 astronomy & astrophysics, Instrumentation, Mathematical Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, COSMIC cancer database, 010308 nuclear & particles physics, Instrumentation and Detectors (physics.ins-det), Computational physics, Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Abstract: The Dark Matter Particle Explorer (DAMPE) is a space-borne particle detector and cosmic ray observatory in operation since 2015, designed to probe electrons and gamma rays from a few GeV to 10 TeV energy, as well as cosmic protons and nuclei up to 100 TeV. Among the main scientific objectives is the precise measurement of the cosmic electron+positron flux, which due to the very large proton background in orbit requires a powerful particle identification method. In the past decade, the field of machine learning has provided us the needed tools. This paper presents a neural network based approach to cosmic electron identification and proton rejection and showcases its performances based on simulated Monte Carlo data. The neural network reaches significantly lower background than the classical, cut-based method for the same detection efficiency, especially at highest energies. A good matching between simulations and real data completes the picture., 19 pages, 12 figures, accepted for publication in Journal of Instrumentation (JINST)
Published: 2021
Full Text: View/download PDF

4. Kant’s 'Categories of Freedom' as the Functions of Willing an Object

Author: Stephan Zimmermann
Subjects: kant, categories of freedom, critique of practical reason, moral philosophy, practical judgement, willing an object, Philosophy (General), B1-5802
Abstract: This paper deals with the “Table of the Categories of Freedom” in the second main chapter of Kant’s Critique of Practical Reason. It provides an account of the role these categories are supposed to play and also of their conceptual content. The key to a proper understanding lies in the realisation that they are derived from the socalled table of judgements in the Critique of Pure Reason and the functions of thinking, which it compiles by means of a metaphysical deduction. I therefore interpret the categories of freedom consistently from the table of judgements and reconstruct their conceptual content from the functions of thinking underlying each category. Furthermore, Kant justifies by means of a transcendental deduction the fact that the categories of freedom necessarily relate to all objects of the will. I argue that the categories are concepts constitutive for the object of the will: the role they play is that of the functions of willing an object. Finally, I show that the categories of freedom reach beyond Kant’s foundation of moral philosophy. They point to the later Metaphysics of Morals in that Kant associates an ambitious systembuilding claim with them. The idea is therefore that the table of the categories organises the system of moral philosophy.
Published: 2024
Full Text: View/download PDF

5. Drivers of soil microbial and detritivore activity across global grasslands

Author: Julia Siebert, Marie Sünnemann, Yann Hautier, Anita C. Risch, Jonathan D. Bakker, Lori Biederman, Dana M. Blumenthal, Elizabeth T. Borer, Miguel N. Bugalho, Arthur A. D. Broadbent, Maria C. Caldeira, Elsa Cleland, Kendi F. Davies, Anu Eskelinen, Nicole Hagenah, Johannes M. H. Knops, Andrew S. MacDougall, Rebecca L. McCulley, Joslin L. Moore, Sally A. Power, Jodi N. Price, Eric W. Seabloom, Rachel Standish, Carly J. Stevens, Stephan Zimmermann, and Nico Eisenhauer
Subjects: Biology (General), QH301-705.5
Abstract: Abstract Covering approximately 40% of land surfaces, grasslands provide critical ecosystem services that rely on soil organisms. However, the global determinants of soil biodiversity and functioning remain underexplored. In this study, we investigate the drivers of soil microbial and detritivore activity in grasslands across a wide range of climatic conditions on five continents. We apply standardized treatments of nutrient addition and herbivore reduction, allowing us to disentangle the regional and local drivers of soil organism activity. We use structural equation modeling to assess the direct and indirect effects of local and regional drivers on soil biological activities. Microbial and detritivore activities are positively correlated across global grasslands. These correlations are shaped more by global climatic factors than by local treatments, with annual precipitation and soil water content explaining the majority of the variation. Nutrient addition tends to reduce microbial activity by enhancing plant growth, while herbivore reduction typically increases microbial and detritivore activity through increased soil moisture. Our findings emphasize soil moisture as a key driver of soil biological activity, highlighting the potential impacts of climate change, altered grazing pressure, and eutrophication on nutrient cycling and decomposition within grassland ecosystems.
Published: 2023
Full Text: View/download PDF

6. Relativistic protons in the Coma galaxy cluster: first gamma-ray constraints ever on turbulent reacceleration

Author: Stephan Zimmer, Fabio Zandanel, G. Brunetti, and GRAPPA (ITFA, IoP, FNWI)
Subjects: Physics, High Energy Astrophysical Phenomena (astro-ph.HE), Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Electron, Astrophysics::Cosmology and Extragalactic Astrophysics, Parameter space, 01 natural sciences, Magnetic field, Radio halo, Space and Planetary Science, Intracluster medium, 0103 physical sciences, Coma Cluster, Halo, 010306 general physics, Astrophysics - High Energy Astrophysical Phenomena, 010303 astronomy & astrophysics, Galaxy cluster
Abstract: The Fermi-LAT collaboration recently published deep upper limits to the gamma-ray emission of the Coma cluster, a cluster that hosts the prototype of giant radio halos. In this paper we extend previous studies and use a formalism that combines particle reacceleration by turbulence and the generation of secondary particles in the intracluster medium to constrain relativistic protons and their role for the origin of the radio halo. We conclude that a pure hadronic origin of the radio halo is clearly disfavoured as it would require magnetic fields that are too strong. For instance $B_0 > 21 ��$G is found in the cluster center assuming that the magnetic energy density scales with thermal density, to be compared with $B_0 \sim 4-5 ��$G as inferred from Rotation Measures (RM) under the same assumption. However secondary particles can still generate the observed radio emission if they are reaccelerated. For the first time the deep gamma-ray limits allow us to derive meaningful constraints if the halo is generated during phases of reacceleration of relativistic protons and their secondaries by cluster-scale turbulence. In this paper we explore a relevant range of parameter-space of reacceleration models. Within this parameter space a fraction of model configurations is already ruled out by current gamma-ray limits, including the cases that assume weak magnetic fields in the cluster core, $B \leq 2-3 ��$G. Interestingly, we also find that the flux predicted by a large fraction of model configurations that assume a magnetic field consistent with RM is not far from the limits. This suggests that a detection of gamma rays from the cluster might be possible in the near future, provided that the electrons generating the radio halo are secondaries reaccelerated and the magnetic field in the cluster is consistent with that inferred from RM., 22 pages, 12 figures, submitted
Published: 2017

7. A Search for Cosmic-ray Proton Anisotropy with the Fermi Large Area Telescope

Author: Eleonora Troja, Soebur Razzaque, Ronaldo Bellazzini, Giacomo Principe, F. Piron, G. Chiaro, M. Kuss, Abhishek Desai, Kazuhiko Hayashi, Regina Caputo, T. A. Porter, E. Orlando, Dario Gasparrini, Hiroyasu Tajima, Keith Bechtol, S. Maldera, Stefano Ciprini, Ioannis Liodakis, E. J. Siskind, Francesco Longo, G. Martí-Devesa, Marco Ajello, J. B. Thayer, S. Rainò, Tsunefumi Mizuno, Matthew Meehan, Olaf Reimer, D. Horan, V. S. Paliya, D. Serini, Diego F. Torres, M. Razzano, Yasushi Fukazawa, Filippo D'Ammando, A. Reimer, Justin Vandenbroucke, G. Jóhannesson, F. de Palma, Manuel Meyer, Alessandro Cuoco, Guido Barbiellini, P. Fusco, I. Mereu, T. J. Brandt, Melissa Pesce-Rollins, Seth Digel, David A. Green, S. J. Fegan, Elizabeth Hays, Peter F. Michelson, Marcello Giroletti, D. J. Suson, S. Cutini, J. W. Hewitt, Eric Nuss, Sina Chen, Massimo Persic, Carmelo Sgrò, Riccardo Rando, G. Spandre, N. Di Lalla, Luca Baldini, Sylvain Guiriec, Mn Mazziotta, D. Costantin, Stephan Zimmer, David Paneque, Luca Latronico, P. de la Torre Luque, Elisabetta Bissaldi, Stefan Funk, Denis Bastieri, Eugenio Bottacini, Alberto Manfreda, Roger Blandford, Nicola Omodei, Johann Cohen-Tanugi, M. Orienti, L. Di Venere, F. Loparco, Nicola Giglietto, Aaron Dominguez, I. A. Grenier, E. Cavazzuti, M. Yassine, R. Bonino, Nestor Mirabal, P. Lubrano, S. Buson, J. Li, Matteo Negro, A. Morselli, R. A. Cameron, P. Bruel, Warit Mitthumsiri, P. Spinelli, Francesco Giordano, F. Gargano, Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire Univers et Particules de Montpellier (LUPM), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Montpellier 2 - Sciences et Techniques (UM2), Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7), Fermi-LAT, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Université de Montpellier (UM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Ajello, M., Baldini, L., Barbiellini, G., Bastieri, D., Bechtol, K., Bellazzini, R., Bissaldi, E., Blandford, R. D., Bonino, R., Bottacini, E., Brandt, T. J., Bruel, P., Buson, S., Cameron, R. A., Caputo, R., Cavazzuti, E., Chen, S., Chiaro, G., Ciprini, S., Cohen-Tanugi, J., Costantin, D., Cuoco, A., Cutini, S., D’Ammando, F., de la Torre Luque, P., de Palma, F., Desai, A., Digel, S. W., Di Lalla, N., Di Venere, L., Domínguez, A., Fegan, S. J., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Giglietto, N., Giordano, F., Giroletti, M., Green, D., Grenier, I. A., Guiriec, S., Hayashi, K., Hays, E., Hewitt, J. W., Horan, D., Jóhannesson, G., Kuss, M., Latronico, L., Li, J., Liodakis, I., Longo, F., Loparco, F., Lubrano, P., Maldera, S., Manfreda, A., Martí-Devesa, G., Mazziotta, M. N., Meehan, M., Mereu, I., Meyer, M., Michelson, P. F., Mirabal, N., Mitthumsiri, W., Mizuno, T., Morselli, A., Negro, M., Nuss, E., Omodei, N., Orienti, M., Orlando, E., Paliya, V. S., Paneque, D., Persic, M., Pesce-Rollins, M., Piron, F., Porter, T. A., Principe, G., Rainò, S., Rando, R., Razzano, M., Razzaque, S., Reimer, A., Reimer, O., Serini, D., Sgrò, C., Siskind, E. J., Spandre, G., Spinelli, P., Suson, D. J., Tajima, H., Thayer, J. B., Torres, D. F., Troja, E., Vandenbroucke, J., Yassine, M., Zimmer, S., Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)), Fermi-Lat Collaboration, T., D'Ammando, F., De La Torre Luque, P., De Palma, F., Dominguez, A., Johannesson, G., Marti-Devesa, G., Raino, S., Sgro, C., ITA, and USA
Subjects: 010504 meteorology & atmospheric sciences, Proton, High-energy astronomy, Astrophysics::High Energy Astrophysical Phenomena, Galactic cosmic rays, High-energy astrophysics, Cosmic ray, Astrophysics::Cosmology and Extragalactic Astrophysics, 7. Clean energy, 01 natural sciences, cosmic radiation: anisotropy, GLAST, Galactic cosmic ray, law.invention, Telescope, Primary (astronomy), law, 0103 physical sciences, Nuclear Experiment, Anisotropy, 010303 astronomy & astrophysics, 0105 earth and related environmental sciences, Physics, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy, Astronomy and Astrophysics, cosmic radiation: primary, p: energy, 13. Climate action, Space and Planetary Science, p: cosmic radiation, anisotropy: dipole, ddc:520, Astrophysics - High Energy Astrophysical Phenomena, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Fermi Gamma-ray Space Telescope
Abstract: The Fermi Large Area Telescope (LAT) has amassed a large data set of primary cosmic-ray protons throughout its mission. The LAT's wide field of view and full-sky survey capabilities make it an excellent instrument for studying cosmic-ray anisotropy. As a space-based survey instrument, the LAT is sensitive to anisotropy in both right ascension and declination, while ground-based observations only measure the anisotropy in right ascension. We present the results of the first ever proton anisotropy search using Fermi LAT. The data set uses eight years of data and consists of approximately 179 million protons above 78 GeV, enabling it to probe dipole anisotropy below an amplitude of $10^{-3}$, resulting in the most stringent limits on the declination dependence of the dipole to date. We measure a dipole amplitude $\delta = 3.9\pm1.5 \times 10^{-4}$ with a p-value of 0.01 (pre-trials) for protons with a minimum energy of 78 GeV. We discuss various systematic effects that could give rise to a dipole excess and calculate upper limits on the dipole amplitude as a function of minimum energy. The 95% CL upper limit on the dipole amplitude is $\delta_{UL}=1.3\times 10^{-3}$ for protons with a minimum energy of 78 GeV and $\delta_{UL}=1.2 \times 10^{-3}$ for protons with a minimum energy of 251 GeV., Comment: 15 pages, 11 figures, Contact authors: Matthew Meehan (mrmeehan@wisc.edu) and Justin Vandenbroucke (justin.vandenbroucke@wisc.edu)
Published: 2019
Full Text: View/download PDF

8. Interpectoral and Pectoserratus Plane Block vs. Local Anesthetic Infiltration for Partial Mastectomy: A Prospective Randomized Trial

Author: Patryk Eisler, Stephan Zimmermann, and Ragnar Henningsson
Subjects: Medicine (General), R5-920
Abstract: Background. Patients undergoing breast surgery are at risk of severe postoperative pain. Several opioid-sparing strategies exist to alleviate this condition. Regional anesthesia has long been a part of perioperative pain management for these patients. Aim. This randomized study examined the benefits of interpectoral and pectoserratus plane block (IPP/PSP), also known as pectoralis nerve plain block, compared with advanced local anesthetic infiltration. Methods. We analyzed 57 patients undergoing partial mastectomy with sentinel node dissection. They received either an ultrasound-guided IPP/PSP block performed preoperatively by an anesthetist or local anesthetic infiltration performed by the surgeon before and during the surgery. Results. Pain measured with the numerical rating scale (NRS) indicated no statistically significant difference between the groups (IPP/PSP 1.67 vs. infiltration 1.97; p value 0.578). Intraoperative use of fentanyl was significantly lower in the IPP/PSP group (0.18 mg vs 0.21 mg; p value 0.041). There was no statistically significant difference in the length of stay in the PACU (166 min vs 175 min; p value 0.51). There were no differences in reported postoperative nausea and vomiting (PONV) between the groups. The difference in postoperative use of oxycodone in the PACU (p value 0.7) and the use of oxycodone within 24 hours postoperatively (p value 0.87) was not statistically significant. Conclusions. Our study showed decreased intraoperative opioid use in the IPP/PSP group and no difference in postoperative pain scores up to 24 hours. Both groups reported low postoperative pain scores. This trial is registered with NCT04824599.
Published: 2024
Full Text: View/download PDF

9. Search for features in the cosmic-ray electron and positron spectrum measured by the Fermi Large Area Telescope

Author: M. N. Mazziotta, Stephan Zimmer, F. Gargano, F. Loparco, F. Costanza, Alessandro Cuoco, Laboratoire d'Annecy de Physique des Particules (LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), and Laboratoire d'Annecy de Physique des Particules (LAPP)
Subjects: exotic, 95.85.Ry, Cosmic rays, dark matter, Astrophysics::High Energy Astrophysical Phenomena, Dark matter, energy spectrum, FOS: Physical sciences, Cosmic ray, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, GLAST, law.invention, thermal, cross section: annihilation, Telescope, S030DMA, Positron, Spitzer Space Telescope, law, 0103 physical sciences, Dark Matter, 010306 general physics, Cosmic rays, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), electron positron, Annihilation, 010308 nuclear & particles physics, dark matter: mass, dark matter: decay, electron: cosmic radiation, dark matter: annihilation, Galaxy, Cosmic-ray Electrons and Positrons, 95.35.+d, galaxy, Astrophysics - High Energy Astrophysical Phenomena, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], signature, positron: cosmic radiation, Fermi Gamma-ray Space Telescope
Abstract: The Large Area Telescope onboard the Fermi Gamma-ray Space Telescope has collected the largest ever sample of high-energy cosmic-ray electron and positron events. Possible features in their energy spectrum could be a signature of the presence of nearby astrophysical sources, or of more exotic sources, such as annihilation or decay of dark matter (DM) particles in the Galaxy. In this paper for the first time we search for a delta-like line feature in the cosmic-ray electron and positron spectrum. We also search for a possible feature originating from DM particles annihilating into electron-positron pairs. Both searches yield negative results, but we are able to set constraints on the line intensity and on the velocity-averaged DM annihilation cross section. Our limits extend up to DM masses of 1.7 $TeV/c^2$, and exclude the thermal value of the annihilation cross-section for DM lighter than 150 $GeV/c^2$., Comment: Matches the version accepted by PRD; the limit has been extended up to 1.7 TeV overlapping most of the region covered by DAMPE and CALET ; 10 pages and 9 figures
Published: 2018
Full Text: View/download PDF

10. An algorithm to resolve {\gamma}-rays from charged cosmic rays with DAMPE

Author: Ya-Peng Zhang, Stephan Zimmer, Meng Su, M. M. Salinas, Shi-Jun Lei, Yun-Feng Liang, Kai-Kai Duan, Z. Xu, Tie-Kuang Dong, Xiang Li, Dongya Guo, Yunlong Zhang, Chuan Yue, Zhao-Qiang Shen, Jing-Jing Zang, S. Garrappa, Qiang Yuan, Wei Jiang, F. Gargano, V. Vagelli, and M. N. Mazziotta
Subjects: Physics, Physics - Instrumentation and Detectors, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Astronomy and Astrophysics, Cosmic ray, Astrophysics, Electron, 01 natural sciences, Calculation methods, Charged particle, Particle detector, High Energy Physics - Experiment, Physics - Instrumentation and Detectors, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics, High Energy Physics - Experiment, Pulsar, Space and Planetary Science, 0103 physical sciences, Scintillation counter, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics, 010303 astronomy & astrophysics, Lepton
Abstract: The DArk Matter Particle Explorer (DAMPE), also known as Wukong in China, launched on December 17, 2015, is a new high energy cosmic ray and {\gamma}-ray satellite-borne observatory in space. One of the main scientific goals of DAMPE is to observe GeV-TeV high energy {\gamma}-rays with accurate energy, angular, and time resolution, to indirectly search for dark matter particles and for the study of high energy astrophysics. Due to the comparatively higher fluxes of charged cosmic rays with respect to {\gamma}-rays, it is challenging to identify {\gamma}-rays with sufficiently high efficiency minimizing the amount of charged cosmic ray contamination. In this work we present a method to identify {\gamma}-rays in DAMPE data based on Monte Carlo simulations, using the powerful electromagnetic/hadronic shower discrimination provided by the calorimeter and the veto detection of charged particles provided by the plastic scintillation detector. Monte Carlo simulations show that after this selection the number of electrons and protons that contaminate the selected {\gamma}-ray events at $\sim10$ GeV amounts to less than 1% of the selected sample. Finally, we use flight data to verify the effectiveness of the method by highlighting known {\gamma}-ray sources in the sky and by reconstructing preliminary light curves of the Geminga pulsar., Comment: 15 pages,16 figures
Published: 2017

11. The DArk Matter Particle Explorer mission

Author: M. M. Ma, Y.L. Xin, Shengxia Zhang, Y. Y. Huang, Y. Z. Gong, H.Y. Zhao, P. Fusco, Zhao-Qiang Shen, Peidong Yang, Zhao-Min Wang, Yuan Zhu Wang, Maria Ionica, Jie Kong, Yun Long Zhang, F. Loparco, Dan Jiang, J.N. Dong, Y. L. Li, X. Y. Peng, J. L. Chen, H. S. Chen, S. C. Wen, Y. F. Dong, Jinglai Duan, P. Azzarello, N. H. Liao, X. L. Wang, M. M. Salinas, M. Caragiulo, Ya Peng Zhang, M. Pohl, V. Gallo, W. Zhang, Andrii Tykhonov, Niu Xiaoyang, Hai Tao Xu, X. X. Li, Shi-Jun Lei, G. Marsella, Wei Jiang, Min Gao, M. S. Cai, X. Zhu, Z. X. Dong, Yong Zhou, S. Y. Ma, Wei Liang Li, A. De Benedittis, Q. An, Sha Wu, Deng Yi Chen, Y. F. Wei, J.B. Zhang, T.T. Miao, G. F. Xue, Chuan Yue, Z.L. Yang, Y.F. Liang, P. Bernardini, Yifan Yang, Laiyu Zhang, Jianyi Yang, W. X. Peng, Z. M. Zhang, Giacinto Donvito, L. G. Wang, J. G. Lu, Y. J. Zhang, R. Qiao, Shan-Shan Gao, Zi-Qing Xia, Hui Jun Yao, Zhi-Yu Sun, Fang Fang, Yi-Zhong Fan, S. Vitillo, Jie Liu, S. Li, J. J. Wei, R. R. Fan, Lei Feng, Y. Zhu, K. Xi, A. D'Amone, Peng-Xiong Ma, Ping Zhang, Xun Feng Zhao, Jianli Zhang, M. N. Mazziotta, H. Su, Di Wu, Y. M. Hu, Da Ming Wei, Chang Yi Zhou, A. Surdo, Yang Liu, Yen-Po Wang, D. Droz, D. D'Urso, W. Chen, Jian Wu, Jin Zhou Wang, F. Zhang, Q. Wang, Jian Hua Guo, M. Duranti, X. J. Teng, Tie-Kuang Dong, I. De Mitri, Xiao Yong Ma, W. H. Shen, X.B. Tian, Chao Zhang, Z. T. Shen, Hong Yun Zhao, Z. Xu, Chang Qing Feng, T. S. Cui, Chunjie Wang, Ju-Xian Song, G. Ambrosi, Q.Z. Liu, Xiaohui Wang, Haiyan Wang, Y. Zhang, X.Q. Ma, Meng Su, D. Mo, Yan Fang Wang, R. Asfandiyarov, Yao Ming Liang, B. Bertucci, Stephan Zimmer, Guang Shun Huang, Yang Haibo, X. Jin, Zhenyu Zhang, M. Di Santo, Tao Ma, Xin Wu, M. Y. Cui, Yongjie Zhang, Yu-Hong Yu, H. Liu, J. N. Rao, Qiang Yuan, S. B. Liu, Jilong Zhang, Chi Wang, W.Q. Gan, Wenqiang Liu, V. Vagelli, Zi Zong Xu, Jin Chang, F. J. Gan, F. Gargano, D.L. Zhang, H. W. Wang, Kai-Kai Duan, K. Gong, G. Z. Shang, Shu Xin Wang, J. J. Zang, Chang, J., Ambrosi, G., An, Q., Asfandiyarov, R., Azzarello, P., Bernardini, P., Bertucci, B., Cai, M. S., Caragiulo, M., Chen, D. Y., Chen, H. F., Chen, J. L., Chen, W., Cui, M. Y., Cui, T. S., D'Amone, A., DE BENEDITTIS, Antonio, De Mitri, I., DI SANTO, Margherita, Dong, J. N., Dong, T. K., Dong, Y. F., Dong, Z. X., Donvito, G., Droz, D., Duan, K. K., Duan, J. L., Duranti, M., D'Urso, D., Fan, R. R., Fan, Y. Z., Fang, F., Feng, C. Q., Feng, L., Fusco, P., Gallo, V., Gan, F. J., Gan, W. Q., Gao, M., Gao, S. S., Gargano, F., Gong, K., Gong, Y. Z., Guo, J. H., Hu, Y. M., Huang, G. S., Huang, Y. Y., Ionica, M., Jiang, D., Jiang, W., Jin, X., Kong, J., Lei, S. J., Li, S., Li, X., Li, W. L., Li, Y., Liang, Y. F., Liang, Y. M., Liao, N. H., Liu, Q. Z., Liu, H., Liu, J., Liu, S. B., Liu, W. Q., Liu, Y., Loparco, F., Lã¼, J., Ma, M., Ma, P. X., Ma, S. Y., Ma, T., Ma, X. Q., Ma, X. Y., Marsella, G., Mazziotta, M. N., Mo, D., Miao, T. T., Niu, X. Y., Pohl, M., Peng, X. Y., Peng, W. X., Qiao, R., Rao, J. N., Salinas, M. M., Shang, G. Z., Shen, W. H., Shen, Z. Q., Shen, Z. T., Song, J. X., Su, H., Su, M., Sun, Z. Y., Surdo, A., Teng, X. J., Tian, X. B., Tykhonov, A., Vagelli, V., Vitillo, S., Wang, C., Wang, Chi, Wang, H., Wang, H. Y., Wang, J. Z., Wang, L. G., Wang, Q., Wang, S., Wang, X. H., Wang, X. L., Wang, Y. F., Wang, Y. P., Wang, Y. Z., Wen, S. C., Wang, Z. M., Wei, D. M., Wei, J. J., Wei, Y. F., Wu, D., Wu, J., Wu, S. S., Wu, X., Xi, K., Xia, Z. Q., Xin, Y. L., Xu, H. T., Xu, Z. L., Xu, Z. Z., Xue, G. F., Yang, H. B., Yang, J., Yang, P., Yang, Y. Q., Yang, Z. L., Yao, H. J., Yu, Y. H., Yuan, Q., Yue, C., Zang, J. J., Zhang, C., Zhang, D. L., Zhang, F., Zhang, J. B., Zhang, J. Y., Zhang, J. Z., Zhang, L., Zhang, P. F., Zhang, S. X., Zhang, W. Z., Zhang, Y., Zhang, Y. J., Zhang, Y. Q., Zhang, Y. L., Zhang, Y. P., Zhang, Z., Zhang, Z. Y., Zhao, H., Zhao, H. Y., Zhao, X. F., Zhou, C. Y., Zhou, Y., Zhu, X., Zhu, Y., Zimmer, S., DE BENEDITTIS, ANTONIO, DI SANTO, MARGHERITA, and LÃ¼, J.
Subjects: Physics - Instrumentation and Detectors, Satellite launches, Gamma ray observatories, Astrophysics, Galactic cosmic rays, 01 natural sciences, Cosmology, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Observatory, Detectors and Experimental Techniques, Cosmic rays , dark matter , space experiments, 010303 astronomy & astrophysics, physics.ins-det, Space science missions, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), astro-ph.HE, Astrophysics::Instrumentation and Methods for Astrophysics, Instrumentation and Detectors (physics.ins-det), Cosmology, Galaxies, Gamma rays, Tellurium compounds, Chinese Academy of Sciences, Dark matter particles, Explorer missions, Galactic cosmic rays, Gamma ray observatories, Satellite launches, Scientific objectives, Space science missions, Cosmic rays, Space Science, Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, Particle Physics - Experiment, Astrophysics and Astronomy, Astrophysics::High Energy Astrophysical Phenomena, Dark matter, FOS: Physical sciences, Cosmic ray, dark matter, Tellurium compounds, 0103 physical sciences, Cosmic rays, Instrumentation and Methods for Astrophysics (astro-ph.IM), 010308 nuclear & particles physics, hep-ex, Gamma rays, Astronomy, Astronomy and Astrophysics, Galaxies, Chinese academy of sciences, Galaxy, Scientific objectives, Dark matter particles, Chinese Academy of Sciences, Satellite, space experiments, Explorer missions, astro-ph.IM
Abstract: The DArk Matter Particle Explorer (DAMPE), one of the four scientific space science missions within the framework of the Strategic Pioneer Program on Space Science of the Chinese Academy of Sciences, is a general purpose high energy cosmic-ray and gamma-ray observatory, which was successfully launched on December 17th, 2015 from the Jiuquan Satellite Launch Center. The DAMPE scientific objectives include the study of galactic cosmic rays up to $\sim 10$ TeV and hundreds of TeV for electrons/gammas and nuclei respectively, and the search for dark matter signatures in their spectra. In this paper we illustrate the layout of the DAMPE instrument, and discuss the results of beam tests and calibrations performed on ground. Finally we present the expected performance in space and give an overview of the mission key scientific goals., 45 pages, including 29 figures and 6 tables. Published in Astropart. Phys
Published: 2017

12. A Parameterized Energy Correction Method for Electromagnetic Showers in BGO-ECAL of DAMPE

Author: Zhiyong Zhang, Jing-Jing Zang, Daming Wei, Chuan Yue, Tie-Kuang Dong, Yunlong Zhang, Xiang Li, Wei Jiang, and Stephan Zimmer
Subjects: Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Primary energy, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Detectors and Experimental Techniques, 010303 astronomy & astrophysics, Instrumentation, physics.ins-det, Physics, Large Hadron Collider, Calorimeter (particle physics), 010308 nuclear & particles physics, hep-ex, Resolution (electron density), Detector, Astrophysics::Instrumentation and Methods for Astrophysics, Linearity, Instrumentation and Detectors (physics.ins-det), Cathode ray, High Energy Physics::Experiment, Energy (signal processing), Particle Physics - Experiment
Abstract: DAMPE is a space-based mission designed as a high energy particle detector measuring cosmic-rays and $\gamma-$rays which was successfully launched on Dec.17, 2015. The BGO electromagnetic calorimeter is one of the key sub-detectors of DAMPE for energy measurement of electromagnetic showers produced by $e^{\pm}/{\gamma}$. Due to energy loss in dead material and energy leakage outside the calorimeter, the deposited energy in BGO underestimates the primary energy of incident $e^{\pm}/{\gamma}$. In this paper, based on detailed MC simulations, a parameterized energy correction method using the lateral and longitudinal information of electromagnetic showers has been studied and verified with data of electron beam test at CERN. The measurements of energy linearity and resolution are significantly improved by applying this correction method for electromagnetic showers., Comment: 10 figures, to be published in Nuclear Inst. and Methods in Physics Research, A
Published: 2017

13. The Fermi Galactic Center GeV Excess and Implications for Dark Matter

Author: Dario Gasparrini, J. Ballet, Francesco Longo, Elisabetta Bissaldi, L. Latronico, Miguel A. Sánchez-Conde, K. Tanaka, P. Bruel, A. S. Johnson, S. W. Digel, T. Ohsugi, M. Orienti, M. Ackermann, Eric Charles, Eleonora Troja, D. Malyshev, Yasunobu Uchiyama, T. H. Burnett, Soebur Razzaque, S. Maldera, F. Costanza, T. Kamae, Warit Mitthumsiri, M. Razzano, Filippo D'Ammando, John W. Hewitt, T. Jogler, G. Barbiellini, M. Kuss, M. Di Mauro, F. de Palma, D. J. Suson, W. B. Focke, T. J. Brandt, Gabrijela Zaharijas, Frederic Piron, Alice K. Harding, Diego F. Torres, Giacomo Principe, Alessandro Cuoco, W. B. Atwood, J. S. Perkins, Matthew Wood, E. Orlando, L. Tibaldo, Jingcheng Li, James Chiang, Andrea Chiappo, Francesco Giordano, Nicola Giglietto, R. Desiante, Roger Blandford, M. Caragiulo, R. A. Cameron, P. Spinelli, R. Buehler, Elizabeth C. Ferrara, Giacomo Vianello, Matteo Negro, A. Morselli, M. N. Lovellette, J. Bregeon, P. A. Caraveo, R. Bonino, Nestor Mirabal, Massimo Persic, Persis S. Drell, Ronaldo Bellazzini, Peter F. Michelson, Marcello Giroletti, K. S. Wood, Olaf Reimer, D. Horan, A. Chekhtman, P. Lubrano, S. Rainò, N. Di Lalla, Luca Baldini, Elliott D. Bloom, Claudia Cecchi, Sylvain Guiriec, Andrea Albert, F. Spada, R. Caputo, F. Gargano, Hiroyasu Tajima, S. J. Fegan, Jan Conrad, Stefan Larsson, C. Favuzzi, G. La Mura, E. J. Siskind, M. N. Mazziotta, M. Gustafsson, Melissa Pesce-Rollins, Pierrick Martin, J. D. Magill, G. A. Gomez-Vargas, Anna Franckowiak, Tsunefumi Mizuno, A. Reimer, E. Hays, Stephan Zimmer, G. Chiaro, J. E. Grove, Yasushi Fukazawa, S. Cutini, A. A. Moiseev, D. Kocevski, T. Glanzman, F. Loparco, M. E. Monzani, Eugenio Bottacini, Alberto Manfreda, Denis Bastieri, S. Ciprini, Marco Ajello, J. B. Thayer, J. F. Ormes, P. Fusco, Stefan Funk, Carmelo Sgrò, Riccardo Rando, D. Simone, David Paneque, I. A. Grenier, E. Cavazzuti, David H. Green, Gloria Spandre, L. Guillemot, E. Nuss, L. Di Venere, Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Univers et Particules de Montpellier (LUPM), Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E), Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Centre National d’Études Spatiales [Paris] (CNES), Unité Scientifique de la Station de Nançay (USN), Université d'Orléans (UO)-Observatoire des Sciences de l'Univers en région Centre (OSUC), PSL Research University (PSL)-PSL Research University (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, PSL Research University (PSL)-Centre National de la Recherche Scientifique (CNRS), Institut de recherche en astrophysique et planétologie (IRAP), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Fermi-LAT, Ackermann, M., Ajello, M., Albert, A., Atwood, W. B., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Bellazzini, R., Bissaldi, E., Blandford, R. D., Bloom, E. D., Bonino, R., Bottacini, E., Brandt, T. J., Bregeon, J., Bruel, P., Buehler, R., Burnett, T. H., Cameron, R. A., Caputo, R., Caragiulo, M., Caraveo, P. A., Cavazzuti, E., Cecchi, C., Charles, E., Chekhtman, A., Chiang, J., Chiappo, A., Chiaro, G., Ciprini, S., Conrad, J., Costanza, F., Cuoco, A., Cutini, S., D'Ammando, F., De Palma, F., Desiante, R., Digel, S. W., Di Lalla, N., Di Mauro, M., Di Venere, L., Drell, P. S., Favuzzi, C., Fegan, S. J., Ferrara, E. C., Focke, W. B., Franckowiak, A., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Giglietto, N., Giordano, F., Giroletti, M., Glanzman, T., Gomez-Vargas, G. A., Green, D., Grenier, I. A., Grove, J. E., Guillemot, L., Guiriec, S., Gustafsson, M., Harding, A. K., Hays, E., Hewitt, J. W., Horan, D., Jogler, T., Johnson, A. S., Kamae, T., Kocevski, D., Kuss, M., La Mura, G., Larsson, S., Latronico, L., Li, J., Longo, F., Loparco, F., Lovellette, M. N., Lubrano, P., Magill, J. D., Maldera, S., Malyshev, D., Manfreda, A., Martin, P., Mazziotta, M. N., Michelson, P. F., Mirabal, N., Mitthumsiri, W., Mizuno, T., Moiseev, A. A., Monzani, M. E., Morselli, A., Negro, M., Nuss, E., Ohsugi, T., Orienti, M., Orlando, E., Ormes, J. F., Paneque, D., Perkins, J. S., Persic, M., Pesce-Rollins, M., Piron, F., Principe, G., Raino, S., Rando, R., Razzano, M., Razzaque, S., Reimer, A., Reimer, O., Sanchez-Conde, M., Sgro, C., Simone, D., Siskind, E. J., Spada, F., Spandre, G., Spinelli, P., Suson, D. J., Tajima, H., Tanaka, K., Thayer, J. B., Tibaldo, L., Torres, D. F., Troja, E., Uchiyama, Y., Vianello, G., Wood, K. S., Wood, M., Zaharijas, G., Zimmer, S., Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), Centre National de la Recherche Scientifique (CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO), Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Laboratoire AIM, Université Paris Diderot - Paris 7 ( UPD7 ) -Centre d'Etudes de Saclay, Laboratoire Univers et Particules de Montpellier ( LUPM ), Centre National de la Recherche Scientifique ( CNRS ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Université Montpellier 2 - Sciences et Techniques ( UM2 ) -Université de Montpellier ( UM ), Laboratoire Leprince-Ringuet ( LLR ), Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -École polytechnique ( X ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Physique et Chimie de l'Environnement et de l'Espace ( LPC2E ), Centre National de la Recherche Scientifique ( CNRS ) -Université d'Orléans ( UO ) -Institut national des sciences de l'Univers ( INSU - CNRS ), Unité Scientifique de la Station de Nançay ( USN ), Institut national des sciences de l'Univers ( INSU - CNRS ) -Observatoire de Paris-Université d'Orléans ( UO ) -Centre National de la Recherche Scientifique ( CNRS ), Institut de recherche en astrophysique et planétologie ( IRAP ), Université Paul Sabatier - Toulouse 3 ( UPS ) -Observatoire Midi-Pyrénées ( OMP ) -Centre National de la Recherche Scientifique ( CNRS ), D’Ammando, F., Palma, F. de, Lalla, N. Di, Mauro, M. Di, Venere, L. Di, Gomez Vargas, G. A., Mura, G. La, Longo, Francesco, Pesce Rollins, M., Rainò, S., Sánchez Conde, M., Sgrò, C., Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Université de Montpellier (UM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and ITA
Subjects: [ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph], Astrophysics, 01 natural sciences, Galaxy: bulge, propagation, gamma ray: flux, 010303 astronomy & astrophysics, cosmic ray, Physics, general [ISM], Galaxy: center, Galactic Center, center [Galaxy], gamma ray: emission, cosmic radiation, Astrophysics - High Energy Astrophysical Phenomena, Milky Way, Astrophysics::High Energy Astrophysical Phenomena, Dark matter, bulge [Galaxy], Cosmic ray, Astrophysics::Cosmology and Extragalactic Astrophysics, cosmic rays, Galaxy: halo, gamma rays: general, ISM: general, Astronomy and Astrophysics, Space and Planetary Science, cross section: annihilation, Galactic halo, gas, 0103 physical sciences, conservation law, halo [Galaxy], Astrophysics::Galaxy Astrophysics, 010308 nuclear & particles physics, background, bubble, Astronomy, dark matter: annihilation, Galactic plane, Galaxy, [SDU]Sciences of the Universe [physics], ddc:520, galaxy, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], general [gamma rays], Fermi Gamma-ray Space Telescope
Abstract: The region around the Galactic center (GC) is now well established to be brighter at energies of a few GeV than expected from conventional models of diffuse gamma-ray emission and catalogs of known gamma-ray sources. We study the GeV excess using 6.5 years of data from the Fermi Large Area Telescope. We characterize the uncertainty of the GC excess spectrum and morphology due to uncertainties in cosmic-ray source distributions and propagation, uncertainties in the distribution of interstellar gas in the Milky Way, and uncertainties due to a potential contribution from the Fermi bubbles. We also evaluate uncertainties in the excess properties due to resolved point sources of gamma rays. The Galactic center is of particular interest as it would be expected to have the brightest signal from annihilation of weakly interacting massive dark matter particles. However, control regions along the Galactic plane, where a dark-matter signal is not expected, show excesses of similar amplitude relative to the local background. Based on the magnitude of the systematic uncertainties, we conservatively report upper limits for the annihilation cross section as function of particle mass and annihilation channel., Comment: Contact authors: A. Albert, E. Charles, A. Franckowiak, D. Malyshev, L. Tibaldo. 63 pages, 34 figures. Published in ApJ
Published: 2017
Full Text: View/download PDF

14. On the Connection between Turbulent Motions and Particle Acceleration in Galaxy Clusters

Author: Stephan Zimmer, Franco Vazza, Fabio Gastaldello, A. Tramacere, Stéphane Paltani, Stefano Ettori, Massimo Gaspari, Dominique Eckert, Eckert, D., Gaspari, M., Vazza, F., Gastaldello, F., Tramacere, A., Zimmer, S., Ettori, S., and Paltani, S.
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO), Astrophysics::High Energy Astrophysical Phenomena, radio continuum: general, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Intracluster medium, 0103 physical sciences, Cluster (physics), 010303 astronomy & astrophysics, acceleration of particle, Galaxy cluster, Astrophysics::Galaxy Astrophysics, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), 010308 nuclear & particles physics, turbulence, Velocity dispersion, Astronomy and Astrophysics, radiation mechanisms: non-thermal, Astronomy and Astrophysic, Astrophysics - Astrophysics of Galaxies, Particle acceleration, Amplitude, Radio halo, galaxies: clusters: general, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), Halo, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: Giant radio halos are Mpc-scale diffuse radio sources associated with the central regions of galaxy clusters. The most promising scenario to explain the origin of these sources is that of turbulent re-acceleration, in which MeV electrons injected throughout the formation history of galaxy clusters are accelerated to higher energies by turbulent motions mostly induced by cluster mergers. In this Letter, we use the amplitude of density fluctuations in the intracluster medium as a proxy for the turbulent velocity and apply this technique to a sample of 51 clusters with available radio data. Our results indicate a segregation in the turbulent velocity of radio halo and radio quiet clusters, with the turbulent velocity of the former being on average higher by about a factor of two. The velocity dispersion recovered with this technique correlates with the measured radio power through the relation $P_{\rm radio}\propto\sigma_v^{3.3\pm0.7}$, which implies that the radio power is nearly proportional to the turbulent energy rate. Our results provide an observational confirmation of a key prediction of the turbulent re-acceleration model and possibly shed light on the origin of radio halos., Comment: Submitted to ApJ Letters
Published: 2017
Full Text: View/download PDF

15. Direct detection of a break in the teraelectronvolt cosmic-ray spectrum of electrons and positrons

Author: J. N. Rao, D. M. Wei, P. Azzarello, Peng-Xiong Ma, Y. H. Yu, Shan-Shan Gao, Chi Wang, Q. An, L. G. Wang, YM Liang, Dong Ya Guo, Min Gao, Z. X. Dong, Jie Liu, Tianxiao Ma, Donghong Chen, Wei Liu, Yifan Yang, Zhihua Zhang, Jun-jun Guo, Y. F. Liang, S. Wang, Huan Zhao, D.L. Zhang, X.Q. Ma, Maria Ionica, Jie Kong, G. Ambrosi, Luzhao Feng, Yu-Sa Wang, Fang Fang, N. H. Liao, D. Mo, Niu Xiaoyang, Yaping Wang, R. Qiao, Qiuju Yuan, I. De Mitri, X.B. Tian, Z. Z. Xu, Zheng Wang, Michael Ma, R. Asfandiyarov, X. X. Li, Y. M. Hu, M. S. Cai, Guangshun Huang, M. Di Santo, H. Liu, J.N. Dong, Z.-Q. Shen, Zhongjie Yang, W. X. Peng, Peidong Yang, Jialong Chen, Stephan Zimmer, Y. F. Wei, K. Xi, Laiyu Zhang, Zhi-Yu Sun, W. Li, F. Loparco, X. L. Wang, Chao Zhang, Y. J. Zhang, Y. Z. Gong, Jindong Zhang, X. Y. Ma, M. Duranti, Kai-Kai Duan, Y. Zhang, Yun-Zhi Zhang, R. R. Fan, Valerio Vagelli, Xixian Wang, Ju-Xian Song, G. Marsella, Meng Su, Yaohui Zhang, Xian-Min Jin, S.X. Li, S. B. Liu, Huijun Yao, Andrii Tykhonov, J. J. Wei, Lihui Wu, X. Y. Peng, H. T. Xu, Yujuan Liu, Hong Yun Zhao, Jie Zhang, S. Y. Ma, Z. Q. Xia, Dan Jiang, Yali Zhou, X. J. Teng, Tie-Kuang Dong, S. C. Wen, Y. Li, A. D'Amone, Yi-Zhong Fan, K. Gong, J. Z. Wang, Yugang Zhang, H. S. Chen, Chengrui Zhou, Giacinto Donvito, Yang Haibo, Zhoubin Zhang, P. Bernardini, W. H. Shen, M. Y. Cui, G. Z. Shang, Chuan Yue, Jindan Zhang, Di Wu, Xin-Fu Zhao, Y. Y. Huang, Z. T. Shen, Qian Wang, P. Fusco, Shumei Wu, J. J. Zang, Y. F. Dong, Jinfei Wu, C. Q. Feng, Jinglai Duan, Huaguang Wang, B. Bertucci, Jin Chang, F. J. Gan, F. Gargano, M. N. Mazziotta, H. Su, Haiqiong Wang, Fengtao Zhang, Z. Xu, Pengchao Zhang, Xin Wu, Y. F. Wang, S. Vitillo, D. Droz, T. S. Cui, V. Gallo, W. Zhang, Wei Jiang, G. F. Xue, S. Garrappa, Yu-Xuan Zhu, D. D'Urso, Shi-Jun Lei, M. M. Salinas, Y.L. Xin, Xi Zhu, Shengxia Zhang, A. Surdo, A. De Benedittis, Wangli Chen, Ambrosi, G., An, Q., Asfandiyarov, R., Azzarello, P., Bernardini, P., Bertucci, B., Cai, M. S., Chang, J., Chen, D. Y., Chen, H. F., Chen, J. L., Chen, W., Cui, M. Y., Cui, T. S., D’Amone, A., De Benedittis, A., De Mitri, I., Di Santo, M., Dong, J. N., Dong, T. K., Dong, Y. F., Dong, Z. X., Donvito, G., Droz, D., Duan, K. K., Duan, J. L., Duranti, M., D’Urso, D., Fan, R. R., Fan, Y. Z., Fang, F., Feng, C. Q., Feng, L., Fusco, P., Gallo, V., Gan, F. J., Gao, M., Gao, S. S., Gargano, F., Garrappa, S., Gong, K., Gong, Y. Z., Guo, D. Y., Guo, J. H., Hu, Y. M., Huang, G. S., Huang, Y. Y., Ionica, M., Jiang, D., Jiang, W., Jin, X., Kong, J., Lei, S. J., Li, S., Li, X., Li, W. L., Li, Y., Liang, Y. F., Liang, Y. M., Liao, N. H., Liu, H., Liu, J., Liu, S. B., Liu, W. Q., Liu, Y., Loparco, F., Ma, M., Ma, P. X., Ma, S. Y., Ma, T., Ma, X. Q., Ma, X. Y., Marsella, G., Mazziotta, M. N., Mo, D., Niu, X. Y., Peng, X. Y., Peng, W. X., Qiao, R., Rao, J. N., Salinas, M. M., Shang, G. Z., H. Shen, W., Shen, Z. Q., Shen, Z. T., Song, J. X., Su, H., Su, M., Sun, Z. Y., Surdo, A., Teng, X. J., Tian, X. B., Tykhonov, A., Vagelli, V., Vitillo, S., Wang, C., Wang, H., Wang, H. Y., Wang, J. Z., Wang, L. G., Wang, Q., Wang, S., Wang, X. H., Wang, X. L., Wang, Y. F., Wang, Y. P., Wang, Y. Z., Wen, S. C., Wang, Z. M., Wei, D. M., Wei, J. J., Wei, Y. F., Wu, D., Wu, J., Wu, L. B., Wu, S. S., Wu, X., Xi, K., Xia, Z. Q., Xin, Y. L., Xu, H. T., Xu, Z. L., Xu, Z. Z., Xue, G. F., Yang, H. B., Yang, P., Yang, Y. Q., Yang, Z. L., Yao, H. J., Yu, Y. H., Yuan, Q., Yue, C., Zang, J. J., Zhang, C., Zhang, D. L., Zhang, F., Zhang, J. B., Zhang, J. Y., Zhang, J. Z., Zhang, L., Zhang, P. F., Zhang, S. X., Zhang, W. Z., Zhang, Y., Zhang, Y. J., Zhang, Y. Q., Zhang, Y. L., Zhang, Y. P., Zhang, Z., Zhang, Z. Y., Zhao, H., Zhao, H. Y., Zhao, X. F., Zhou, C. Y., Zhou, Y., Zhu, X., Zhu, Y., and Zimmer, S.
Subjects: Astrophysics::High Energy Astrophysical Phenomena, Dark matter, FOS: Physical sciences, Cosmic ray, Electron, 01 natural sciences, dark matter, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), Positron, cosmic rays, 0103 physical sciences, 010303 astronomy & astrophysics, Cherenkov radiation, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, cosmic rays , dark matter , electrons , space experiments, Multidisciplinary, Annihilation, 010308 nuclear & particles physics, Settore FIS/01 - Fisica Sperimentale, Spectrum (functional analysis), electrons, Galaxy, High Energy Physics - Phenomenology, High Energy Physics::Experiment, space experiments, Astrophysics - High Energy Astrophysical Phenomena
Abstract: High energy cosmic ray electrons plus positrons (CREs), which lose energy quickly during their propagation, provide an ideal probe of Galactic high-energy processes and may enable the observation of phenomena such as dark-matter particle annihilation or decay. The CRE spectrum has been directly measured up to $\sim 2$ TeV in previous balloon- or space-borne experiments, and indirectly up to $\sim 5$ TeV by ground-based Cherenkov $\gamma$-ray telescope arrays. Evidence for a spectral break in the TeV energy range has been provided by indirect measurements of H.E.S.S., although the results were qualified by sizeable systematic uncertainties. Here we report a direct measurement of CREs in the energy range $25~{\rm GeV}-4.6~{\rm TeV}$ by the DArk Matter Particle Explorer (DAMPE) with unprecedentedly high energy resolution and low background. The majority of the spectrum can be properly fitted by a smoothly broken power-law model rather than a single power-law model. The direct detection of a spectral break at $E \sim0.9$ TeV confirms the evidence found by H.E.S.S., clarifies the behavior of the CRE spectrum at energies above 1 TeV and sheds light on the physical origin of the sub-TeV CREs., Comment: 18 pages, 6 figures, Nature in press, doi:10.1038/nature24475
Published: 2017

16. Erratum: 'Search for Gamma-Ray Emission from the Coma Cluster with Six Years of Fermi-LAT Data' (2016, ApJ, 819, 149)

Author: Luca Latronico, I. A. Grenier, E. Cavazzuti, David H. Green, Igor V. Moskalenko, Hiroyasu Tajima, Johann Cohen-Tanugi, Francesco Longo, L. Di Venere, S. Murgia, G. A. Caliandro, Gloria Spandre, Jan Conrad, Olaf Reimer, Liang Li, Guido Barbiellini, T. Ohsugi, Johan Bregeon, S. Rainò, Tsunefumi Mizuno, Ronaldo Bellazzini, M. Orienti, G. Chiaro, S. Cutini, C. Favuzzi, Diego F. Torres, Yasushi Fukazawa, G. Jóhannesson, Eric Charles, A. De Angelis, G. Tosti, E. J. Siskind, S. Maldera, Carmelo Sgrò, Riccardo Rando, P. Fusco, Giacomo Vianello, S. J. Fegan, G. Godfrey, Jean Ballet, W. B. Atwood, M. Caragiulo, E. Nuss, F. Loparco, J. W. Hewitt, D. Horan, L. Tibaldo, Markus Ackermann, Nicola Giglietto, David Paneque, M. Kuss, Vahé Petrosian, Stefano Ciprini, E. Troja, M. Mayer, Elliott D. Bloom, R. Buehler, M. N. Lovellette, F. de Palma, P. A. Caraveo, Seb. Funk, R. Bonino, Persis S. Drell, Peter F. Michelson, Marcello Giroletti, Marco Ajello, J. B. Thayer, F. Piron, G. M. Madejski, Hiromitsu Takahashi, Andrea Albert, F. Gargano, E. Orlando, P. Lubrano, Jingcheng Li, J. F. Ormes, Roger Blandford, A. Reimer, J. M. Casandjian, K. S. Wood, Stephan Zimmer, Luca Baldini, M. E. Monzani, Sylvain Guiriec, Mn Mazziotta, Yoel Rephaeli, Melissa Pesce-Rollins, T. A. Porter, Denis Bastieri, Seth Digel, Elisabetta Bissaldi, G. Pivato, E. Hays, Eugenio Bottacini, Alberto Manfreda, Dario Gasparrini, Miguel A. Sánchez-Conde, F. Spada, Stefan Larsson, M. Razzano, Filippo D'Ammando, Keith Bechtol, A. Chekhtman, Warit Mitthumsiri, P. Spinelli, Francesco Giordano, R. A. Cameron, P. Bruel, R. Desiante, A. Morselli, Claudia Cecchi, ITA, USA, FRA, and DEU
Subjects: Physics, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Gamma ray, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, Space and Planetary Science, 0103 physical sciences, Coma Cluster, ddc:520, 010306 general physics, Fermi Gamma-ray Space Telescope
Abstract: We present results from $\gamma$-ray observations of the Coma cluster incorporating six years of Fermi-LAT data and the newly released "Pass 8" event-level analysis. Our analysis of the region reveals low-significance residual structures within the virial radius of the cluster that are too faint for a detailed investigation with the current data. Using a likelihood approach that is free of assumptions on the spectral shape we derive upper limits on the $\gamma$-ray flux that is expected from energetic particle interactions in the cluster. We also consider a benchmark spatial and spectral template motivated by models in which the observed radio halo is mostly emission by secondary electrons. In this case, the median expected and observed upper limits for the flux above 100 $\mathrm{MeV}$ are 1.7 × $10^{−9} ph$ $cm^{−2} s^{−1}$ and 5.2 × $10^{−9} ph$ $cm^{−2} s^{−1}$ respectively (the latter corresponds to residual emission at the level of 1.8$\sigma$). These bounds are comparable to or higher than predicted levels of hadronic gamma-ray emission in cosmic-ray (CR) models with or without reacceleration of secondary electrons, although direct comparisons are sensitive to assumptions regarding the origin and propagation mode of CRs and magnetic field properties. The minimal expected $\gamma$-ray flux from radio and star-forming galaxies within the Coma cluster is roughly an order of magnitude below the median sensitivity of our analysis.
Published: 2018
Full Text: View/download PDF

17. Resolving the Extragalactic γ-Ray Background above 50 GeV with the Fermi Large Area Telescope

Author: Seb. Funk, Nicola Omodei, Luca Latronico, Soebur Razzaque, G. Godfrey, Elisabetta Bissaldi, G. Pivato, W. B. Atwood, Roger W. Romani, J. S. Perkins, Elizabeth C. Ferrara, F. de Palma, J. D. Magill, E. Hays, André Schulz, Nicola Giglietto, Diego F. Torres, S. J. Fegan, R. J. Britto, G. Jóhannesson, M. Razzano, Filippo D'Ammando, Melissa Pesce-Rollins, Francesco Longo, A. A. Moiseev, Eric Charles, M. N. Lovellette, P. A. Caraveo, Persis S. Drell, D. J. Suson, Luca Baldini, S. Rainò, Tsunefumi Mizuno, A. De Angelis, Jean Ballet, E. J. Siskind, M. Caragiulo, Sylvain Guiriec, Warit Mitthumsiri, Mn Mazziotta, T. A. Porter, G. Chiaro, A. Reimer, Yasushi Fukazawa, F. Loparco, A. Franckowiak, Stefano Ciprini, P. Spinelli, E. Troja, R. Desiante, R. Bonino, M. Di Mauro, Hiromitsu Takahashi, Francesco Giordano, M. Mayer, Markus Ackermann, F. Piron, G. M. Madejski, P. Fusco, Elliott D. Bloom, R. A. Cameron, A. Chekhtman, P. Lubrano, Giacomo Vianello, G. La Mura, P. Bruel, Dario Gasparrini, Carmelo Sgrò, Riccardo Rando, Miguel A. Sánchez-Conde, G. Iafrate, E. Orlando, R. Buehler, D. Simone, E. Nuss, F. Spada, C. Okada, David Paneque, Jingcheng Li, Claudia Cecchi, Seth Digel, Peter F. Michelson, Marcello Giroletti, M. Kuss, Benoit Lott, J. F. Ormes, D. Horan, Johan Bregeon, F. Gargano, T. Reposeur, L. R. Cominsky, Igor V. Moskalenko, Matteo Negro, Olaf Reimer, M. Yassine, A. Morselli, Vahé Petrosian, Keith Bechtol, Marco Ajello, J. B. Thayer, Stefan Larsson, C. Favuzzi, S. Cutini, Andrea Albert, James Chiang, Roger Blandford, Ronaldo Bellazzini, Stephan Zimmer, M. E. Monzani, T. Ohsugi, J. Schmid, Liang Li, Guido Barbiellini, Denis Bastieri, Paolo Giommi, Alberto Manfreda, S. Maldera, F. Costanza, Johann Cohen-Tanugi, L. Tibaldo, L. Di Venere, S. Murgia, G. A. Caliandro, I. A. Grenier, E. Cavazzuti, David H. Green, Gloria Spandre, Aaron Dominguez, T. Jogler, Département de Physique des Particules (ex SPP) (DPP), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire Univers et Particules de Montpellier (LUPM), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Montpellier 2 - Sciences et Techniques (UM2), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Fermi-LAT, Ackermann, M, Ajello, M., Albert, A., Atwood, W. B., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Bechtol, K., Bellazzini, R., Bissaldi, E., Blandford, R. D., Bloom, E. D., Bonino, R., Bregeon, J., Britto, R. J., Bruel, P., Buehler, R., Caliandro, G. A., Cameron, R. A., Caragiulo, M., Caraveo, P. A., Cavazzuti, E., Cecchi, C., Charles, E., Chekhtman, A., Chiang, J., Chiaro, G., Ciprini, S., Cohen Tanugi, J., Cominsky, L. R., Costanza, F., Cutini, S., D'Ammando, F., De Angelis, A., De Palma, F., Desiante, R., Digel, S. W., Di Mauro, M., Di Venere, L., Domínguez, A., Drell, P. S., Favuzzi, C., Fegan, S. J., Ferrara, E. C., Franckowiak, A., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Giglietto, N., Giommi, P., Giordano, F., Giroletti, M., Godfrey, G., Green, D., Grenier, I. A., Guiriec, S., Hays, E., Horan, D., Iafrate, G., Jogler, T., Jóhannesson, G., Kuss, M., La Mura, G., Larsson, S., Latronico, L., Li, J., Li, L., Longo, Francesco, Loparco, F., Lott, B., Lovellette, M. N., Lubrano, P., Madejski, G. M., Magill, J., Maldera, S., Manfreda, A., Mayer, M., Mazziotta, M. N., Michelson, P. F., Mitthumsiri, W., Mizuno, T., Moiseev, A. A., Monzani, M. E., Morselli, A., Moskalenko, I. V., Murgia, S., Negro, M., Nuss, E., Ohsugi, T., Okada, C., Omodei, N., Orlando, E., Ormes, J. F., Paneque, D., Perkins, J. S., Pesce Rollins, M., Petrosian, V., Piron, F., Pivato, G., Porter, T. A., Rainò, S., Rando, R., Razzano, M., Razzaque, S., Reimer, A., Reimer, O., Reposeur, T., Romani, R. W., Sánchez Conde, M., Schmid, J., Schulz, A., Sgrò, C., Simone, D., Siskind, E. J., Spada, F., Spandre, G., Spinelli, P., Suson, D. J., Takahashi, H., Thayer, J. B., Tibaldo, L., Torres, D. F., Troja, E., Vianello, G., Yassine, M., Zimmer, S., ITA, Laboratoire Univers et Particules de Montpellier ( LUPM ), Centre National de la Recherche Scientifique ( CNRS ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Université Montpellier 2 - Sciences et Techniques ( UM2 ) -Université de Montpellier ( UM ), Laboratoire Leprince-Ringuet ( LLR ), Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -École polytechnique ( X ) -Centre National de la Recherche Scientifique ( CNRS ), Centre d'Etudes Nucléaires de Bordeaux Gradignan ( CENBG ), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Ackermann M, Ajello M, Albert A, Atwood WB, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Bissaldi E, Blandford RD, Bloom ED, Bonino R, Bregeon J, Britto RJ, Bruel P, Buehler R, Caliandro GA, Cameron RA, Caragiulo M, Caraveo PA, Cavazzuti E, Cecchi C, Charles E, Chekhtman A, Chiang J, Chiaro G, Ciprini S, Cohen-Tanugi J, Cominsky LR, Costanza F, Cutini S, DAmmando F, de Angelis A, de Palma F, Desiante R, Digel SW, Di Mauro M, Di Venere L, Dominguez A, Drell PS, Favuzzi C, Fegan SJ, Ferrara EC, Franckowiak A, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Giglietto N, Giommi P, Giordano F, Giroletti M, Godfrey G, Green D, Grenier IA, Guiriec S, Hays E, Horan D, Iafrate G, Jogler T, Johannesson G, Kuss M, La Mura G, Larsson S, Latronico L, Li J, Li L, Longo F, Loparco F, Lott B, Lovellette MN, Lubrano P, Madejski GM, Magill J, Maldera S, Manfreda A, Mayer M, Mazziotta MN, Michelson PF, Mitthumsiri W, Mizuno T, Moiseev AA, Monzani ME, Morselli A, Moskalenko IV, Murgia S, Negro M, Nuss E, Ohsugi T, Okada C, Omodei N, Orlando E, Ormes JF, Paneque D, Perkins JS, Pesce-Rollins M, Petrosian V, Piron F, Pivato G, Porter TA, Raino S, Rando R, Razzano M, Razzaque S, Reimer A, Reimer O, Reposeur T, Romani RW, Sanchez-Conde M, Schmid J, Schulz A, Sgro C, Simone D, Siskind EJ, Spada F, Spandre G, Spinelli P, Suson DJ, Takahashi H, Thayer JB, Tibaldo L, Torres DF, Troja E, Vianello G, Yassine M, Zimmer S, Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Département de Physique des Particules (ex SPP) (DPhP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université de Montpellier (UM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Cherenkov Telescope Array, [ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph], Population, General Physics and Astronomy, Flux, Astrophysics, photon: fluctuation, Euclidean, 01 natural sciences, GLAST, law.invention, Telescope, blazar: energy spectrum, Physics and Astronomy (all), law, Physics and Astronomy, Gamma Ray, Active Galactic Nuclei, 0103 physical sciences, ddc:550, Source counts, extragalactic gamma-ray background, Fermi-LAT, Blazar, education, 010303 astronomy & astrophysics, Monte Carlo, flux: energy dependence, Physics, education.field_of_study, 010308 nuclear & particles physics, background, Astronomy, Galaxy, gamma ray: emission, angular resolution, galaxy, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Fermi Gamma-ray Space Telescope, acceptance
Abstract: Physical review letters 116(15), 151105(2016). doi:10.1103/PhysRevLett.116.151105, The Fermi Large Area Telescope (LAT) Collaboration has recently released a catalog of 360 sources detected above 50 GeV (2FHL). This catalog was obtained using 80 months of data re-processed with Pass 8, the newest event-level analysis, which significantly improves the acceptance and angular resolution of the instrument. Most of the 2FHL sources at high Galactic latitude are blazars. Using detailed Monte Carlo simulations, we measure, for the first time, the source count distribution, dN/dS, of extragalactic γ-ray sources at E>50 GeV and find that it is compatible with a Euclidean distribution down to the lowest measured source flux in the 2FHL (∼8×10$^{−12}$ ph cm$^{−2}$ s$^{−1}$). We employ a one-point photon fluctuation analysis to constrain the behavior of dN/dS below the source detection threshold. Overall, the source count distribution is constrained over three decades in flux and found compatible with a broken power law with a break flux, Sb, in the range [8×10$^{−12}$,1.5×10$^{−11}$] ph cm$^{−2}$ s$^{−1}$ and power-law indices below and above the break of $\alpha_2$∈[1.60,1.75] and $\alpha_1$=2.49±0.12, respectively. Integration of dN/dS shows that point sources account for at least 86$^{+16}_{−14}$% of the total extragalactic γ-ray background. The simple form of the derived source count distribution is consistent with a single population (i.e., blazars) dominating the source counts to the minimum flux explored by this analysis. We estimate the density of sources detectable in blind surveys that will be performed in the coming years by the Cherenkov Telescope Array., Published by APS, College Park, Md.
Published: 2016
Full Text: View/download PDF

18. FERMI-LAT OBSERVATIONS of HIGH-ENERGY γ-RAY EMISSION TOWARD the GALACTIC CENTER

Author: J. D. Magill, W. B. Atwood, M. Ohno, Nicola Giglietto, T. Ohsugi, Eleonora Troja, Andrea Albert, R. Desiante, Paolo Giommi, R. A. Cameron, F. Spada, R. Caputo, Hiroyasu Tajima, James Chiang, Roger Blandford, Jan Conrad, Nicola Omodei, J. F. Ormes, Stefan Larsson, P. Bruel, Carmelo Sgrò, Riccardo Rando, E. Nuss, T. J. Brandt, Johan Bregeon, G. Jóhannesson, A. Morselli, Stephan Zimmer, David Paneque, M. Kuss, Eugenio Bottacini, Alberto Manfreda, Liang Li, Keith Bechtol, G. Godfrey, F. de Palma, F. Piron, Denis Bastieri, M. Gustafsson, M. E. Monzani, C. Karwin, Guido Barbiellini, D.J. Suson, A. A. Moiseev, Alice K. Harding, Jingcheng Li, S. Rainò, Tsunefumi Mizuno, F. Loparco, G. A. Gomez-Vargas, P. M. Saz Parkinson, R. Buehler, M. Razzano, G. Chiaro, Elisabetta Bissaldi, Filippo D'Ammando, A. Reimer, G. Pivato, E. J. Siskind, M. N. Lovellette, D. Malyshev, H. Takahashi, D.F. Torres, D. Horan, R. Bonino, P. Fusco, Peter F. Michelson, Marcello Giroletti, P. A. Caraveo, T. Glanzman, S. Maldera, A. S. Johnson, S. Cutini, Melissa Pesce-Rollins, Y. Uchiyama, T. Kamae, Claudia Cecchi, Francesco Longo, Persis S. Drell, Steven Ritz, T. A. Porter, E. Orlando, L. R. Cominsky, Igor V. Moskalenko, Luca Latronico, Olaf Reimer, A. Chekhtman, Sylvain Guiriec, John W. Hewitt, M. Caragiulo, Elizabeth C. Ferrara, D.A. Smith, Warit Mitthumsiri, Mn Mazziotta, P. Lubrano, C. Favuzzi, G. Zaharijas, P. Spinelli, Francesco Giordano, Marco Ajello, J. B. Thayer, T. Jogler, Dario Gasparrini, K. S. Wood, B.L. Winer, S. Buson, Stefano Ciprini, Miguel A. Sánchez-Conde, F. Gargano, M. Mayer, Elliott D. Bloom, Johann Cohen-Tanugi, L. Di Venere, Jürgen Knödlseder, S. Murgia, G. A. Caliandro, I. A. Grenier, Ronaldo Bellazzini, Gloria Spandre, A. B. Hill, A. De Angelis, G. Tosti, Giacomo Vianello, Laboratoire Univers et Particules de Montpellier (LUPM), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Département de Physique des Particules (ex SPP) (DPhP), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de recherche en astrophysique et planétologie (IRAP), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Université de Toulouse (UT), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Fermi-LAT, Université de Montpellier (UM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département de Physique des Particules (ex SPP) (DPP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Université Fédérale Toulouse Midi-Pyrénées, Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Montpellier 2 - Sciences et Techniques (UM2), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), ITA, Ajello M, Albert A, Atwood WB, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Bissaldi E, Blandford RD, Bloom ED, Bonino R, Bottacini E, Brandt TJ, Bregeon J, Bruel P, Buehler R, Buson S, Caliandro GA, Cameron RA, Caputo R, Caragiulo M, Carave PA, Cecchi C, Chekhtman A, Chiang J, Chiaro G, Ciprini S, Cohen-Tanugi J, Cominsky LR, Conrad J, Cutini S, DAmmando F, de Angelis A, de Palma F, Desiante R, Di Venere L, Drell PS, Favuzzi C, Ferrara EC, Fusco P, Gargano F, Gasparrini D, Giglietto N, Giommi P, Giordano F, Giroletti M, Glanzman T, Godfrey G, Gomez-Vargas GA, Grenier IA, Guiriec S, Gustafsson M, Harding AK, Hewitt JW, Hill AB, Horan D, Jogler T, Johannesson G, Johnson AS, Kamae T, Karwin C, Knodlseder J, Kuss M, Larsson S, Latronico L, Li J, Li L, Longo F, Loparco F, Lovellette MN, Lubrano P, Magill J, Maldera S, Malyshev D, Manfreda A, Mayer M, Mazziotta MN, Michelson PF, Mitthumsiri W, Mizuno T, Moiseev AA, Monzani ME, Morselli A, Moskalenko IV, Murgia S, Nuss E, Ohno M, Ohsugi T, Omodei N, Orlando E, Ormes JF, Paneque D, Pesce-Rollins M, Piron F, Pivato G, Porter TA, Raino S, Rando R, Razzano M, Reimer A, Reimer O, Ritz S, Sanchez-Conde M, Parkinson PMS, Sgro C, Siskind EJ, Smith DA, Spada F, Spandre G, Spinelli P, Suson DJ, Tajima H, Takahashi H, Thayer JB, Torres DF, Tosti G, Troja E, Uchiyama Y, Vianello G, Winer BL, Wood KS, Zaharijas G, Zimmer S, Ajello, M., Albert, A., Atwood, W. B., Barbiellini, G., Bastieri, D., Bechtol, K., Bellazzini, R., Bissaldi, E., Blandford, R. D., Bloom, E. D., Bonino, R., Bottacini, E., Brandt, T. J., Bregeon, J., Bruel, P., Buehler, R., Buson, S., Caliandro, G. A., Cameron, R. A., Caputo, R., Caragiulo, M., Caraveo, P. A., Cecchi, C., Chekhtman, A., Chiang, J., Chiaro, G., Ciprini, S., Cohen Tanugi, J., Cominsky, L. R., Conrad, J., Cutini, S., D'Ammando, F., De Angelis, A., De Palma, F., Desiante, R., Di Venere, L., Drell, P. S., Favuzzi, C., Ferrara, E. C., Fusco, P., Gargano, F., Gasparrini, D., Giglietto, N., Giommi, P., Giordano, F., Giroletti, M., Glanzman, T., Godfrey, G., Gomez Vargas, G. A., Grenier, I. A., Guiriec, S., Gustafsson, M., Harding, A. K., Hewitt, J. W., Hill, A. B., Horan, D., Jogler, T., Jóhannesson, G., Johnson, A. S., Kamae, T., Karwin, C., Knödlseder, J., Kuss, M., Larsson, S., Latronico, L., Li, J., Li, L., Longo, Francesco, Loparco, F., Lovellette, M. N., Lubrano, P., Magill, J., Maldera, S., Malyshev, D., Manfreda, A., Mayer, M., Mazziotta, M. N., Michelson, P. F., Mitthumsiri, W., Mizuno, T., Moiseev, A. A., Monzani, M. E., Morselli, A., Moskalenko, I. V., Murgia, S., Nuss, E., Ohno, M., Ohsugi, T., Omodei, N., Orlando, E., Ormes, J. F., Paneque, D., Pesce Rollins, M., Piron, F., Pivato, G., Porter, T. A., Rainò, S., Rando, R., Razzano, M., Reimer, A., Reimer, O., Ritz, S., Sánchez Conde, M., Saz Parkinson, P. M., Sgrò, C., Siskind, E. J., Smith, D. A., Spada, F., Spandre, G., Spinelli, P., Suson, D. J., Tajima, H., Takahashi, H., Thayer, J. B., Torres, D. F., Tosti, G., Troja, E., Uchiyama, Y., Vianello, G., Winer, B. L., Wood, K. S., Zaharijas, G., and Zimmer, S.
Subjects: cosmic rays, Galaxy: center, gamma-rays: general, gamma-rays: ISM, radiation mechanisms: non-thermal, cosmic rays, Galaxy: center, gamma-rays: general, gamma-rays: ISM, radiation mechanisms: non-thermal, Astronomy and Astrophysics, Space and Planetary Science, Astrophysics, 01 natural sciences, High Energy Physics - Experiment, law.invention, law, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Emission spectrum, ISM [gamma-rays], 010303 astronomy & astrophysics, cosmic ray, Physics, [SDU.ASTR.HE]Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Galactic Center, Gamma ray, center [Galaxy], non-thermal [radiation mechanisms], particle: interaction, High Energy Physics - Phenomenology, gamma ray: emission, cosmic radiation, electron: interaction, [SDU.ASTR.GA]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Galactic Astrophysics [astro-ph.GA], Astrophysics - High Energy Astrophysical Phenomena, general [gamma-rays], Astrophysics::High Energy Astrophysical Phenomena, Cosmic ray, Astrophysics::Cosmology and Extragalactic Astrophysics, GLAST, emission: model, Telescope, gas, 0103 physical sciences, structure, Astrophysics::Galaxy Astrophysics, 010308 nuclear & particles physics, background, scattering, nucleus, Astronomy, Astronomy and Astrophysic, Galaxy, Interstellar medium, flux, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], ddc:520, galaxy, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Fermi Gamma-ray Space Telescope
Abstract: The astrophysical journal 819(1), 44 (2016). doi:10.3847/0004-637X/819/1/44, The Fermi Large Area Telescope (LAT) has provided the most detailed view to date of the emission toward the Galactic center (GC) in high-energy γ-rays. This paper describes the analysis of data taken during the first 62 months of the mission in the energy range 1–100 GeV from a 15° × 15° region about the direction of the GC. Specialized interstellar emission models (IEMs) are constructed to enable the separation of the γ-ray emissions produced by cosmic ray particles interacting with the interstellar gas and radiation fields in the Milky Way into that from the inner ~1 kpc surrounding the GC, and that from the rest of the Galaxy. A catalog of point sources for the 15° × 15° region is self-consistently constructed using these IEMs: the First Fermi-LAT Inner Galaxy Point Source Catalog (1FIG). The spatial locations, fluxes, and spectral properties of the 1FIG sources are presented, and compared with γ-ray point sources over the same region taken from existing catalogs. After subtracting the interstellar emission and point-source contributions a residual is found. If templates that peak toward the GC are used to model the positive residual the agreement with the data improves, but none of the additional templates tried account for all of its spatial structure. The spectrum of the positive residual modeled with these templates has a strong dependence on the choice of IEM., Published by Univ.11032, Chicago, Ill. [u.a.]
Published: 2016
Full Text: View/download PDF

19. Deep view of the Large Magellanic Cloud with six years of Fermi-LAT observations

Author: T. Ohsugi, Eleonora Troja, Olaf Reimer, W. B. Atwood, T. J. Brandt, Jean Ballet, F. Piron, Andrea Albert, C. Favuzzi, Nicola Giglietto, Stefano Ciprini, P. Martin, M. Mayer, Elliott D. Bloom, J. F. Ormes, M. Razzano, Stephan Zimmer, T. A. Porter, James Chiang, Filippo D'Ammando, Dario Gasparrini, Alice K. Harding, E. J. Siskind, P. A. Caraveo, Denis Bastieri, Jingcheng Li, Persis S. Drell, Miguel A. Sánchez-Conde, S. Rainò, Roger W. Romani, R. A. Cameron, A. Chekhtman, Tsunefumi Mizuno, D. Horan, P. Lubrano, André Schulz, M. E. Monzani, David A. Smith, G. Chiaro, F. Loparco, M. N. Mazziotta, R. Desiante, A. Reimer, Markus Ackermann, Seth Digel, Hiromitsu Takahashi, Elisabetta Bissaldi, S. Maldera, G. Pivato, A. Morselli, Eric Charles, E. Orlando, Melissa Pesce-Rollins, D. J. Suson, I. A. Grenier, F. Gargano, S. Cutini, E. Cavazzuti, Luca Latronico, R. Bonino, Gloria Spandre, Claudia Cecchi, Elizabeth C. Ferrara, Gudlaugur Johannesson, Johann Cohen-Tanugi, M.-H. Grondin, S. Murgia, W. B. Focke, G. A. Caliandro, P. Spinelli, F. Spada, Francesco Giordano, Stefan Larsson, Luca Baldini, Lucas Guillemot, Sylvain Guiriec, Liang Li, Guido Barbiellini, M. Orienti, Matthew Wood, P. Fusco, Francesco Longo, L. Tibaldo, M. Caragiulo, G. Godfrey, F. de Palma, Diego F. Torres, Pascal Bruel, R. Buehler, Peter F. Michelson, Carmelo Sgrò, Riccardo Rando, E. Nuss, David Paneque, M. Kuss, J. B. Thayer, A. Franckowiak, A. B. Hill, Johan Bregeon, A. De Angelis, G. Tosti, Giacomo Vianello, Jürgen Knödlseder, Ronaldo Bellazzini, Deutsches Elektronen-Synchrotron [Zeuthen] (DESY), Helmholtz-Gemeinschaft = Helmholtz Association, Santa Cruz Institute for Particle Physics (SCIPP), University of California [Santa Cruz] (UCSC), University of California-University of California, Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7), Laboratoire Univers et Particules de Montpellier (LUPM), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Montpellier 2 - Sciences et Techniques (UM2), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), SLAC National Accelerator Laboratory (SLAC), Stanford University, Istituto Nazionale di Fisica Nucleare, sezione di Bari (INFN, sezione di Bari), Istituto Nazionale di Fisica Nucleare (INFN), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Unité Scientifique de la Station de Nançay (USN), Centre National de la Recherche Scientifique (CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université d'Orléans (UO), Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E), Observatoire des Sciences de l'Univers en région Centre (OSUC), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National d’Études Spatiales [Paris] (CNES), GSFC Astrophysics Science Division, NASA Goddard Space Flight Center (GSFC), Istituto Nazionale di Fisica Nucleare [Pisa] (INFN), Royal Institute of Technology [Stockholm] (KTH ), Institut d'Estudis Espacials de Catalunya (IEEC-CSIC), Hansen Experimental Physics Lab [Stanford] (HEPL), Hiroshima University, ITA, University of California [Santa Cruz] (UC Santa Cruz), University of California (UC)-University of California (UC), Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), Ackermann M, Albert A, Atwood WB, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bellazzini R, Bissaldi E, Bloom ED, Bonino R, Brandt TJ, Bregeon J, Bruel P, Buehler R, Caliandro GA, Cameron RA, Caragiulo M, Caraveo PA, Cavazzuti E, Cecchi C, Charles E, Chekhtman A, Chiang J, Chiaro G, Ciprini S, Cohen-Tanugi J, Cutini S, DAmmando F, de Angelis A, de Palma F, Desiante R, Digel SW, Drell PS, Favuzzi C, Ferrara EC, Focke WB, Franckowiak A, Fusco P, Gargano F, Gasparrini D, Giglietto N, Giordano F, Godfrey G, Grenier IA, Grondin MH, Guillemot L, Guiriec S, Harding AK, Hill AB, Horan D, Johannesson G, Knodlseder J, Kuss M, Larsson S, Latronico L, Li J, Li L, Longo F, Loparco F, Lubrano P, Maldera S, Martin P, Mayer M, Mazziotta MN, Michelson PF, Mizuno T, Monzani ME, Morselli A, Murgia S, Nuss E, Ohsugi T, Orienti M, Orlando E, Ormes JF, Paneque D, Pesce-Rollins M, Piron F, Pivato G, Porter TA, Raino S, Rando R, Razzano M, Reimer A, Reimer O, Romani RW, Sanchez-Conde M, Schulz A, Sgro C, Siskind EJ, Smith DA, Spada F, Spandre G, Spinelli P, Suson DJ, Takahashi H, Thayer JB, Tibaldo L, Torres DF, Tosti G, Troja E, Vianello G, Wood M, Zimmer S, Ackermann, M., Albert, A., Atwood, W. B., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Bellazzini, R., Bissaldi, E., Bloom, E. D., Bonino, R., Brandt, T. J., Bregeon, J., Bruel, P., Buehler, R., Caliandro, G. A., Cameron, R. A., Caragiulo, M., Caraveo, P. A., Cavazzuti, E., Cecchi, C., Charles, E., Chekhtman, A., Chiang, J., Chiaro, G., Ciprini, S., Cohen Tanugi, J., Cutini, S., D'Ammando, F., De Angelis, A., De Palma, F., Desiante, R., Digel, S. W., Drell, P. S., Favuzzi, C., Ferrara, E. C., Focke, W. B., Franckowiak, A., Fusco, P., Gargano, F., Gasparrini, D., Giglietto, N., Giordano, F., Godfrey, G., Grenier, I. A., Grondin, M. H., Guillemot, L., Guiriec, S., Harding, A. K., Hill, A. B., Horan, D., Jóhannesson, G., Knödlseder, J., Kuss, M., Larsson, S., Latronico, L., Li, J., Li, L., Longo, Francesco, Loparco, F., Lubrano, P., Maldera, S., Martin, P., Mayer, M., Mazziotta, M. N., Michelson, P. F., Mizuno, T., Monzani, M. E., Morselli, A., Murgia, S., Nuss, E., Ohsugi, T., Orienti, M., Orlando, E., Ormes, J. F., Paneque, D., Pesce Rollins, M., Piron, F., Pivato, G., Porter, T. A., Rainò, S., Rando, R., Razzano, M., Reimer, A., Reimer, O., Romani, R. W., Sánchez Conde, M., Schulz, A., Sgrò, C., Siskind, E. J., Smith, D. A., Spada, F., Spandre, G., Spinelli, P., Suson, D. J., Takahashi, H., Thayer, J. B., Tibaldo, L., Torres, D. F., Tosti, G., Troja, E., Vianello, G., Wood, M., Zimmer, S., Helmholtz-Gemeinschaft, Université de Montpellier (UM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Stanford Linear Accelerator Center (SLAC), Stanford University [Stanford], National Institute for Nuclear Physics (INFN), Université d'Orléans (UO)-Observatoire des Sciences de l'Univers en région Centre (OSUC), PSL Research University (PSL)-PSL Research University (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, PSL Research University (PSL)-Centre National de la Recherche Scientifique (CNRS), PSL Research University (PSL)-PSL Research University (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), GFSC Astrophysics Science Division, and Hansen Experimental Physics Laboratory (HEPL)
Subjects: [SDU.ASTR.CO]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Milky Way, Astrophysics::High Energy Astrophysical Phenomena, Magellanic Cloud, Population, Cosmic ray, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, cosmic rays, 0103 physical sciences, Magellanic Clouds, Astrophysics::Solar and Stellar Astrophysics, Large Magellanic Cloud, education, Supernova remnant, gamma rays: galaxies / Magellanic Clouds / cosmic rays, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Physics, education.field_of_study, Line-of-sight, galaxie [Gamma rays], 010308 nuclear & particles physics, Cosmic rays, Gamma rays: galaxies, Astronomy and Astrophysics, Space and Planetary Science, Astronomy, Astronomy and Astrophysic, Galaxy, ddc:520, Fermi Gamma-ray Space Telescope
Abstract: Context. The nearby Large Magellanic Cloud (LMC) provides a rare opportunity of a spatially resolved view of an external star-forming galaxy in γ-rays. The LMC was detected at 0.1-100 GeV as an extended source with CGRO/EGRET and using early observations with the Fermi-LAT. The emission was found to correlate with massive star-forming regions and to be particularly bright towards 30 Doradus. Aims: Studies of the origin and transport of cosmic rays (CRs) in the Milky Way are frequently hampered by line-of-sight confusion and poor distance determination. The LMC offers a complementary way to address these questions by revealing whether and how the γ-ray emission is connected to specific objects, populations of objects, and structures in the galaxy. Methods: We revisited the γ-ray emission from the LMC using about 73 months of Fermi-LAT P7REP data in the 0.2-100 GeV range. We developed a complete spatial and spectral model of the LMC emission, for which we tested several approaches: a simple geometrical description, template-fitting, and a physically driven model for CR-induced interstellar emission. Results: In addition to identifying PSR J0540-6919 through its pulsations, we find two hard sources positionally coincident with plerion N 157B and supernova remnant N 132D, which were also detected at TeV energies with H.E.S.S. We detect an additional soft source that is currently unidentified. Extended emission dominates the total flux from the LMC. It consists of an extended component of about the size of the galaxy and additional emission from three to four regions with degree-scale sizes. If it is interpreted as CRs interacting with interstellar gas, the large-scale emission implies a large-scale population of ~1-100 GeV CRs with a density of ~30% of the local Galactic value. On top of that, the three to four small-scale emission regions would correspond to enhancements of the CR density by factors 2 to 6 or higher, possibly more energetic and younger populations of CRs compared to the large-scale population. An alternative explanation is that this is emission from an unresolved population of at least two dozen objects, such as pulsars and their nebulae or supernova remnants. This small-scale extended emission has a spatial distribution that does not clearly correlate with known components of the LMC, except for a possible relation to cavities and supergiant shells. Conclusions: The Fermi-LAT GeV observations allowed us to detect individual sources in the LMC. Three of the newly discovered sources are associated with rare and extreme objects. The 30 Doradus region is prominent in GeV γ-rays because PSR J0540-6919 and N 157B are strong emitters. The extended emission from the galaxy has an unexpected spatial distribution, and observations at higher energies and in radio may help to clarify its origin. FITS file of Fig. 1 is only available at the CDS via anonymous ftp to href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/586/A71">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/586/A71
Published: 2016
Full Text: View/download PDF

20. Fermi large area telescope detection of extended gamma-ray emission from the radio galaxy Fornax A

Author: P. Lubrano, A. De Angelis, G. Tosti, Giacomo Vianello, M. Caragiulo, G. Godfrey, K. S. Wood, Ronaldo Bellazzini, J. D. Magill, F. de Palma, Gudlaugur Johannesson, R. Bonino, Seth Digel, A. B. Hill, J. Schmid, Hiromitsu Takahashi, Roger Blandford, A. Reimer, Liang Li, M. N. Mazziotta, Igor V. Moskalenko, E. Orlando, T. Ohsugi, Eleonora Troja, Guido Barbiellini, Olaf Reimer, S. Kensei, R. Buehler, S. Maldera, Matteo Negro, T. Jogler, A. Morselli, Eric Charles, T. J. Brandt, Dario Gasparrini, S. Rainò, Marco Ajello, Francesco Longo, Tsunefumi Mizuno, J. B. Thayer, Peter F. Michelson, Marcello Giroletti, M. Orienti, C. Favuzzi, W. McConville, G. Chiaro, F. Piron, F. Costanza, Masanori Ohno, Yasushi Fukazawa, Jean Ballet, S. Cutini, Diego F. Torres, J. W. Hewitt, C. C. Cheung, Markos Georganopoulos, F. Gargano, Stefano Ciprini, Stephan Zimmer, M. Mayer, Elliott D. Bloom, Jingcheng Li, Johan Bregeon, M. Di Mauro, Stefan Funk, Sara Buson, Julie McEnery, E. J. Siskind, S. J. Fegan, T. A. Porter, Carmelo Sgrò, Riccardo Rando, E. Hays, D. Simone, E. Nuss, David Paneque, P. Fusco, M. E. Monzani, F. Loparco, M. Kuss, D. J. Thompson, Markus Ackermann, Luca Latronico, Elizabeth C. Ferrara, Claudia Cecchi, Melissa Pesce-Rollins, I. A. Grenier, N. Di Lalla, Luca Baldini, Sylvain Guiriec, E. Cavazzuti, David H. Green, R. Desiante, Gloria Spandre, Johann Cohen-Tanugi, L. Di Venere, S. Murgia, G. A. Caliandro, J. F. Ormes, A. Chekhtman, Warit Mitthumsiri, W. B. Focke, P. Spinelli, Francesco Giordano, R. A. Cameron, P. Bruel, J. M. Cohen, M. Razzano, Filippo D'Ammando, F. Spada, J. S. Perkins, Nicola Giglietto, Stefan Larsson, P. A. Caraveo, Denis Bastieri, Łukasz Stawarz, Elisabetta Bissaldi, G. Pivato, Alberto Manfreda, David S. Davis, Matthew Wood, Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7), Université Montpellier 2 - Sciences et Techniques (UM2), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Fermi-LAT, Ackermann, M., Ajello, M., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Bellazzini, R., Bissaldi, E., Blandford, R. D., Bloom, E. D., Bonino, R., Brandt, T. J., Bregeon, J., Bruel, P., Buehler, R., Buson, S., Caliandro, G. A., Cameron, R. A., Caragiulo, M., Caraveo, P. A., Cavazzuti, E., Cecchi, C., Charles, E., Chekhtman, A., Cheung, C. C., Chiaro, G., Ciprini, S., Cohen, J. M., Cohen Tanugi, J., Costanza, F., Cutini, S., D'Ammando, F., Davis, D. S., De Angelis, A., De Palma, F., Desiante, R., Digel, S. W., Di Lalla, N., Di Mauro, M., Di Venere, L., Favuzzi, C., Fegan, S. J., Ferrara, E. C., Focke, W. B., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Georganopoulos, M., Giglietto, N., Giordano, F., Giroletti, M., Godfrey, G., Green, D., Grenier, I. A., Guiriec, S., Hays, E., Hewitt, J. W., Hill, A. B., Jogler, T., Jóhannesson, G., Kensei, S., Kuss, M., Larsson, S., Latronico, L., Li, J., Li, L., Longo, Francesco, Loparco, F., Lubrano, P., Magill, J. D., Maldera, S., Manfreda, A., Mayer, M., Mazziotta, M. N., Mcconville, W., Mcenery, J. E., Michelson, P. F., Mitthumsiri, W., Mizuno, T., Monzani, M. E., Morselli, A., Moskalenko, I. V., Murgia, S., Negro, M., Nuss, E., Ohno, M., Ohsugi, T., Orienti, M., Orlando, E., Ormes, J. F., Paneque, D., Perkins, J. S., Pesce Rollins, M., Piron, F., Pivato, G., Porter, T. A., Rainò, S., Rando, R., Razzano, M., Reimer, A., Reimer, O., Schmid, J., Sgrò, C., Simone, D., Siskind, E. J., Spada, F., Spandre, G., Spinelli, P., Stawarz, Ł., Takahashi, H., Thayer, J. B., Thompson, D. J., Torres, D. F., Tosti, G., Troja, E., Vianello, G., Wood, K. S., Wood, M., Zimmer, S., Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Ackermann M, Ajello M, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bellazzini R, Bissaldi E, Blandford RD, Bloom ED, Bonino R, Brandt TJ, Bregeon J, Bruel P, Buehler R, Buson S, Caliandro GA, Cameron RA, Caragiulo M, Caraveo PA, Cavazzuti E, Cecchi C, Charles E, Chekhtman A, Cheung CC, Chiaro G, Ciprini S, Cohen JM, Cohen-Tanugi J, Costanza F, Cutini S, DAmmando F, Davis DS, de Angelis A, de Palma F, Desiante R, Digel SW, Di Lalla N, Di Mauro M, Di Venere L, Favuzzi C, Fegan SJ, Ferrara EC, Focke WB, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Georganopoulos M, Giglietto N, Giordano F, Giroletti M, Godfrey G, Green D, Grenier IA, Guiriec S, Hays E, Hewitt JW, Hill AB, Jogler T, Johnnesson G, Kensei S, Kuss M, Larsson S, Latronico L, Li J, Li L, Longo F, Loparco F, Lubrano P, Magill JD, Maldera S, Manfreda A, Mayer M, Mazziotta MN, McConville W, McEnery JE, Michelson PF, Mitthumsiri W, Mizuno T, Monzani ME, Morselli A, Moskalenko IV, Murgia S, Negro M, Nuss E, Ohno M, Ohsugi T, Orienti M, Orlando E, Ormes JF, Paneque D, Perkins JS, Pesce-Rollins M, Piron F, Pivato G, Porter TA, Raino S, Rando R, Razzano M, Reimer A, Reimer O, Schmid J, Sgro C, Simone D, Siskind EJ, Spada F, Spandre G, Spinelli P, Stawarz L, Takahashi H, Thayer JB, Thompson DJ, Torres DF, Tosti G, Troja E, Vianello G, Wood KS, Wood M, Zimmer S, ITA, Laboratoire AIM, Université Paris Diderot - Paris 7 ( UPD7 ) -Centre d'Etudes de Saclay, Université Montpellier 2 - Sciences et Techniques ( UM2 ), Laboratoire Leprince-Ringuet ( LLR ), Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -École polytechnique ( X ) -Centre National de la Recherche Scientifique ( CNRS ), and Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112))
Subjects: Radio galaxy, [ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph], Astrophysics::High Energy Astrophysical Phenomena, galaxies: active, jets [galaxies], galaxies: individual, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Galaxy merger, 01 natural sciences, law.invention, Telescope, galaxies: individual (Fornax A), galaxies: jets, gamma rays: galaxies, radiation mechanisms: non-thermal, Astronomy and Astrophysics, Space and Planetary Science, individual: Fornax A [galaxies], law, 0103 physical sciences, galaxie [gamma rays], Brightest cluster galaxy, Interacting galaxy, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Dwarf galaxy, Physics, 010308 nuclear & particles physics, individual (Fornax A) [galaxies], Astronomy, Quasar, Astronomy and Astrophysic, non-thermal [radiation mechanisms], galaxies: active – galaxies: individual (Fornax A) – galaxies: jets – gamma rays: galaxies – radiation mechanisms: non-thermal, jet [galaxies], active [galaxies], galaxies [gamma rays], ddc:520, Astrophysics - High Energy Astrophysical Phenomena, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Fermi Gamma-ray Space Telescope
Abstract: The astrophysical journal 826(1), 1 (2016). doi:10.3847/0004-637X/826/1/1, We report the Fermi Large Area Telescope detection of extended γ-ray emission from the lobes of the radio galaxy Fornax A using 6.1 years of Pass 8 data. After Centaurus A, this is now the second example of an extended γ-ray source attributed to a radio galaxy. Both an extended flat disk morphology and a morphology following the extended radio lobes were preferred over a point-source description, and the core contribution was constrained to be $\lt 14$% of the total γ-ray flux. A preferred alignment of the γ-ray elongation with the radio lobes was demonstrated by rotating the radio lobes template. We found no significant evidence for variability on ~0.5 year timescales. Taken together, these results strongly suggest a lobe origin for the γ-rays. With the extended nature of the $\gt 100\;{\rm{MeV}}$ γ-ray emission established, we model the source broadband emission considering currently available total lobe radio and millimeter flux measurements, as well as X-ray detections attributed to inverse Compton (IC) emission off the cosmic microwave background (CMB). Unlike the Centaurus A case, we find that a leptonic model involving IC scattering of CMB and extragalactic background light (EBL) photons underpredicts the γ-ray fluxes by factors of about ~2–3, depending on the EBL model adopted. An additional γ-ray spectral component is thus required, and could be due to hadronic emission arising from proton–proton collisions of cosmic rays with thermal plasma within the radio lobes., Published by Univ.11032, Chicago, Ill. [u.a.]
Published: 2016
Full Text: View/download PDF

21. Sensitivity Projections for Dark Matter Searches with the Fermi Large Area Telescope

Author: Brandon Anderson, Elliott D. Bloom, Stephan Zimmer, M. Razzano, Alessandro Cuoco, E. Charles, Matthew Wood, Keith Bechtol, Gabrijela Zaharijas, J. Gaskins, Regina Caputo, M. Gustafsson, Andrea Albert, L. Tibaldo, M. Di Mauro, Johann Cohen-Tanugi, Manuel Meyer, Miguel A. Sánchez-Conde, Nestor Mirabal, Alex Drlica-Wagner, Luca Baldini, F. Ceraudo, G. A. Gomez-Vargas, Seth Digel, Marco Ajello, Laboratoire Univers et Particules de Montpellier (LUPM), Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Fermi-LAT, Faculty of Science, and GRAPPA (ITFA, IoP, FNWI)
Subjects: dark matter: interaction, Physics beyond the Standard Model, Astrophysics::High Energy Astrophysical Phenomena, Dark matter, General Physics and Astronomy, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, dark matter: density, Physics and Astronomy(all), Fermi-LAT, Gamma-ray observations, Physics and Astronomy (all), 01 natural sciences, GLAST, law.invention, thermal, Telescope, Spitzer Space Telescope, law, 0103 physical sciences, axion: coupling, 010303 astronomy & astrophysics, Axion, Dwarf galaxy, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), 010308 nuclear & particles physics, new physics, background, photon, dark matter: decay, dark matter: annihilation, stability, sensitivity, Galaxy, galaxy, Astrophysics - High Energy Astrophysical Phenomena, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], statistical, up: mass, Fermi Gamma-ray Space Telescope
Abstract: The nature of dark matter is a longstanding enigma of physics; it may consist of particles beyond the Standard Model that are still elusive to experiments. Among indirect search techniques, which look for stable products from the annihilation or decay of dark matter particles, or from axions coupling to high-energy photons, observations of the $\gamma$-ray sky have come to prominence over the last few years, because of the excellent sensitivity of the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope mission. The LAT energy range from 20 MeV to above 300 GeV is particularly well suited for searching for products of the interactions of dark matter particles. In this report we describe methods used to search for evidence of dark matter with the LAT, and review the status of searches performed with up to six years of LAT data. We also discuss the factors that determine the sensitivities of these searches, including the magnitudes of the signals and the relevant backgrounds, considering both statistical and systematic uncertainties. We project the expected sensitivities of each search method for 10 and 15 years of LAT data taking. In particular, we find that the sensitivity of searches targeting dwarf galaxies, which provide the best limits currently, will improve faster than the square root of observing time. Current LAT limits for dwarf galaxies using six years of data reach the thermal relic level for masses up to 120 GeV for the $b\bar{b}$ annihilation channel for reasonable dark matter density profiles. With projected discoveries of additional dwarfs, these limits could extend to about 250 GeV. With as much as 15 years of LAT data these searches would be sensitive to dark matter annihilations at the thermal relic cross section for masses to greater than 400 GeV (200 GeV) in the $b\bar{b}$ ($\tau^+ \tau^-$) annihilation channels., Comment: Updated with a few additional and corrected references; otherwise, text is identical to previous version. Submitted on behalf of the Fermi-LAT collaboration. Accepted for publication in Physics Reports, 59 pages, 34 figures; corresponding author: Eric Charles (echarles@slac.stanford.edu)
Published: 2016
Full Text: View/download PDF

22. FERMI-LAT OBSERVATIONS of the LIGO EVENT GW150914

Author: Denis Bastieri, G. A. Gomez-Vargas, Andrea Albert, J. L. Racusin, M. N. Mazziotta, Roger W. Romani, S. Maldera, James Chiang, Roger Blandford, Eric Charles, Gabrijela Zaharijas, Steven Ritz, R. J. Britto, D. J. Suson, P. M. Saz Parkinson, M. Marelli, Stephan Zimmer, Gudlaugur Johannesson, M. Caragiulo, M. Giomi, T. H. Burnett, T. J. Brandt, M. E. Monzani, Lucas Guillemot, David A. Smith, T. Ohsugi, Eleonora Troja, Liang Li, R. Bonino, Guido Barbiellini, A. Reimer, J. Becerra González, Nestor Mirabal, Dario Gasparrini, Elisabetta Bissaldi, G. Pivato, S. Kensei, Matteo Negro, N. Di Lalla, Luca Baldini, L. S. Rochester, A. Morselli, T. Glanzman, Seth Digel, P. Fusco, Eugenio Bottacini, Alberto Manfreda, A. Chekhtman, P. Lubrano, T. Reposeur, Matthew G. Baring, Sara Buson, Sylvain Guiriec, R. A. Cameron, Jean Ballet, E. Hays, A. Franckowiak, G. Godfrey, Brandon Anderson, J. G. Thayer, Stefano Ciprini, S. Cutini, A. A. Moiseev, Stefan Funk, T. A. Porter, D. Dumora, S. Rainò, J. D. Magill, Daniel Kocevski, Paolo Giommi, F. de Palma, Tsunefumi Mizuno, Marianne Lemoine-Goumard, M. Mayer, Elliott D. Bloom, G. Chiaro, F. Loparco, M. Orienti, F. Piron, G. M. Madejski, J. E. Grove, Yasushi Fukazawa, Marco Ajello, R. Dubois, J. B. Thayer, J. W. Hewitt, Manuel Meyer, Jonathan Granot, J. F. Ormes, Alice K. Harding, D. Horan, E. Orlando, E. Moretti, F. Costanza, T. Kamae, P. Spinelli, Melissa Pesce-Rollins, B. Condon, R. Desiante, Daniela Hadasch, Soebur Razzaque, Makoto Arimoto, Jingcheng Li, I. A. Grenier, K. S. Wood, L. Tibaldo, Francesco Giordano, Johan Bregeon, Nicola Omodei, Carmelo Sgrò, Riccardo Rando, A. B. Hill, E. Cavazzuti, Matthew Wood, Julie McEnery, D. Simone, E. Nuss, David Paneque, S. J. Fegan, M. Kuss, J. M. Casandjian, L. R. Cominsky, P. Bruel, Igor V. Moskalenko, Olaf Reimer, N. Gehrels, D. J. Thompson, C. Favuzzi, Tonia M. Venters, Giacomo Vianello, G. La Mura, Ronaldo Bellazzini, F. Gargano, Luca Latronico, Elizabeth C. Ferrara, E. J. Siskind, Magnus Axelsson, Markus Ackermann, Diego F. Torres, R. Buehler, Peter F. Michelson, Marcello Giroletti, F. Spada, R. Caputo, Hiroyasu Tajima, Stefan Larsson, Filippo D'Ammando, Alessandro Cuoco, W. B. Atwood, J. S. Perkins, Nicola Giglietto, M. N. Lovellette, P. A. Caraveo, Persis S. Drell, Francesco Longo, T. Jogler, Sylvia J. Zhu, Aaron Dominguez, Yasunobu Uchiyama, M. Di Mauro, David H. Green, Gloria Spandre, Johann Cohen-Tanugi, L. Di Venere, M.-H. Grondin, S. Murgia, G. A. Caliandro, Stanford University [Stanford], Groupe de Recherche en Physique des Hautes Energies (GRPHE), Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut Universitaire de Technologie de Colmar, Los Alamos National Laboratory (LANL), Santa Cruz Institute for Particle Physics (SCIPP), University of California [Santa Cruz] (UCSC), University of California-University of California, Groupe de Recherche en Economie Théorique et Appliquée (GREThA), Université de Bordeaux (UB)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Théorique - UMR CNRS 3681 (IPHT), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7), Stanford Linear Accelerator Center (SLAC), UGC-DAE Consortium for Scientific Research, AUTRES, Department of Clinical and Molecular Medicine, Institut Pasteur, Fondation Cenci Bolognetti - Istituto Pasteur Italia, Fondazione Cenci Bolognetti, Réseau International des Instituts Pasteur (RIIP)-Réseau International des Instituts Pasteur (RIIP)-Università degli Studi di Roma 'La Sapienza' [Rome], IHU-LIRYC, CHU Bordeaux [Bordeaux]-Université Bordeaux Segalen - Bordeaux 2, GLAST, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Istituto Nazionale di Ricerca Metrologica, Torino, London School of Hygiene and Tropical Medicine (LSHTM), Istituto Nazionale di Fisica Nucleare, sezione di Bari (INFN, sezione di Bari), National Institute for Nuclear Physics (INFN), Istituto Nazionale di Astrofisica (INAF), École nationale supérieure d'architecture de Nantes (ENSA Nantes), Unité Scientifique de la Station de Nançay (USN), Université d'Orléans (UO)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, PSL Research University (PSL)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E), Observatoire des Sciences de l'Univers en région Centre (OSUC), PSL Research University (PSL)-PSL Research University (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), GFSC Astrophysics Science Division, NASA Goddard Space Flight Center (GSFC), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, DIEE, University of Cagliari, University of Gothenburg (GU), China Agricultural University (CAU), Laboratoire de Météorologie Dynamique (UMR 8539) (LMD), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS Paris)-École normale supérieure - Paris (ENS Paris), Laboratoire Univers et Particules de Montpellier (LUPM), Université de Montpellier (UM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Hansen Experimental Physics Laboratory (HEPL), Institut Pasteur de Montevideo, Réseau International des Instituts Pasteur (RIIP), University of Botswana, Department of Animal and Avian Sciences, University of Maryland [College Park], University of Maryland System-University of Maryland System, Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Medical Sciences Division, Northern Ontario School of Medicine, Centre de Recherche Interdisciplinaire sur la Biologie, la Santé la Société, et l’Environnement, Université du Québec à Montréal (UQAM), Centre Hospitalier Universitaire de Dijon - Hôpital François Mitterrand (CHU Dijon), Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA), École normale supérieure - Paris (ENS Paris)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique (CNRS), Institute of Infection, Immunity and Inflammation, University of Glasgow, École nationale supérieure d'architecture de Versailles (ENSA-V), Department of Plant Sciences [Davis, CA], University of California [Davis] (UC Davis), Sea Mammal Research Unit, University of St Andrews [Scotland], Department of Physics [Tokyo], Rikkyo University [Tokyo], Naval Research Laboratory (NRL), Zhejiang University, Laboratoire de Conception Fabrication Commande (LCFC), Université de Lorraine (UL)-École Nationale Supérieure d'Arts et Métiers (ENSAM), Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM)-Arts et Métiers Sciences et Technologies, HESAM Université (HESAM)-HESAM Université (HESAM), Stanford University, Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-IUT de Colmar, Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA)), University of California [Santa Cruz] (UC Santa Cruz), University of California (UC)-University of California (UC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), SLAC National Accelerator Laboratory (SLAC), Department of Molecular Medicine, Réseau International des Instituts Pasteur (RIIP)-Réseau International des Instituts Pasteur (RIIP)-Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome] (UNIROMA), Université Bordeaux Segalen - Bordeaux 2-CHU Bordeaux [Bordeaux], Istituto Nazionale di Fisica Nucleare (INFN), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), GSFC Astrophysics Science Division, École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Hansen Experimental Physics Lab [Stanford] (HEPL), Université du Québec à Montréal = University of Québec in Montréal (UQAM), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Department of Plant Sciences [Univ California Davis] (Plant - UC Davis), Université de Lorraine (UL)-Arts et Métiers Sciences et Technologies, HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM), ITA, Institut Universitaire de Technologie de Colmar-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA)), Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Réseau International des Instituts Pasteur (RIIP)-Réseau International des Instituts Pasteur (RIIP)-Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome], Centre National de la Recherche Scientifique (CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université d'Orléans (UO), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National d’Études Spatiales [Paris] (CNES), Département des Géosciences - ENS Paris, École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-École des Ponts ParisTech (ENPC)-École polytechnique (X)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Ackermann, M., Ajello, M., Albert, A., Anderson, B., Arimoto, M., Atwood, W. B., Axelsson, M., Baldini, L., Ballet, J., Barbiellini, G., Baring, M. G., Bastieri, D., Gonzalez, J. Becerra, Bellazzini, R., Bissaldi, E., Blandford, R. D., Bloom, E. D., Bonino, R., Bottacini, E., Brandt, T. J., Bregeon, J., Britto, R. J., Bruel, P., Buehler, R., Burnett, T. H., Buson, S., Caliandro, G. A., Cameron, R. A., Caputo, R., Caragiulo, M., Caraveo, P. A., Casandjian, J. M., Cavazzuti, E., Charles, E., Chekhtman, A., Chiang, J., Chiaro, G., Ciprini, S., Cohen Tanugi, J., Cominsky, L. R., Condon, B., Costanza, F., Cuoco, A., Cutini, S., D'Ammando, F., Palma, F. De, Desiante, R., Digel, S. W., Lalla, N. Di, Mauro, M. Di, Venere, L. Di, Domnguez, A., Drell, P. S., Dubois, R., Dumora, D., Favuzzi, C., Fegan, S. J., Ferrara, E. C., Franckowiak, A., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Gehrels, N., Giglietto, N., Giomi, M., Giommi, P., Giordano, F., Giroletti, M., Glanzman, T., Godfrey, G., Gomez Vargas, G. A., Granot, J., Green, D., Grenier, I. A., Grondin, M. H., Grove, J. E., Guillemot, L., Guiriec, S., Hadasch, D., Harding, A. K., Hays, E., Hewitt, J. W., Hill, A. B., Horan, D., Jogler, T., Jóhannesson, G., Kamae, T., Kensei, S., Kocevski, D., Kuss, M., Mura, G. La, Larsson, S., Latronico, L., Lemoine Goumard, M., Li, J., Li, L., Longo, Francesco, Loparco, F., Lovellette, M. N., Lubrano, P., Madejski, G. M., Magill, J., Maldera, S., Manfreda, A., Marelli, M., Mayer, M., Mazziotta, M. N., Mcenery, J. E., Meyer, M., Michelson, P. F., Mirabal, N., Mizuno, T., Moiseev, A. A., Monzani, M. E., Moretti, E., Morselli, A., Moskalenko, I. V., Murgia, S., Negro, M., Nuss, E., Ohsugi, T., Omodei, N., Orienti, M., Orlando, E., Ormes, J. F., Paneque, D., Perkins, J. S., Pesce Rollins, M., Piron, F., Pivato, G., Porter, T. A., Racusin, J. L., Rain, S., Rando, R., Razzaque, S., Reimer, A., Reimer, O., Reposeur, T., Ritz, S., Rochester, L. S., Romani, R. W., Parkinson, P. M. Saz, Sgr, C., Simone, D., Siskind, E. J., Smith, D. A., Spada, F., Spandre, G., Spinelli, P., Suson, D. J., Tajima, H., Thayer, J. G., Thayer, J. B., Thompson, D. J., Tibaldo, L., Torres, D. F., Troja, E., Uchiyama, Y., Venters, T. M., Vianello, G., Wood, K. S., Wood, M., Zaharijas, G., Zhu, S., Zimmer, S., Ackermann M, Ajello M, Albert A, Anderson B, Arimoto M, Atwood WB, Axelsson M, Baldini L, Ballet J, Barbiellini G, Baring MG, Bastieri D, Gonzalez JB, Bellazzini R, Bissaldi E, Blandford RD, Bloom ED, Bonino R, Bottacini E, Brandt TJ, Bregeon J, Britto RJ, Bruel P, Buehler R, Burnett TH, Buson S, Caliandro GA, Cameron RA, Caputo R, Caragiulo M, Caraveo PA, Casandjian JM, Cavazzuti E, Charles E, Chekhtman A, Chiang J, Chiaro G, Ciprini S, Cohen-Tanugi J, Cominsky LR, Condon B, Costanza F, Cuoco A, Cutini S, DAmmando F, de Palma F, Desiante R, Digel SW, Di Lalla N, Di Mauro M, Di Venere L, Dominguez A, Drell PS, Dubois R, Dumora D, Favuzzi C, Fegan SJ, Ferrara EC, Franckowiak A, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Gehrels N, Giglietto N, Giomi M, Giommi P, Giordano F, Giroletti M, Glanzman T, Godfrey G, Gomez-Vargas GA, Granot J, Green D, Grenier IA, Grondin MH, Grove JE, Guillemot L, Guiriec S, Hadasch D, Harding AK, Hays E, Hewitt JW, Hill AB, Horan D, Jogler T, Johannesson G, Kamae T, Kensei S, Kocevski D, Kuss M, La Mura G, Larsson S, Latronico L, Lemoine-Goumard M, Li J, Li L, Longo F, Loparco F, Lovellette MN, Lubrano P, Madejski GM, Magill J, Maldera S, Manfreda A, Marelli M, Mayer M, Mazziotta MN, McEnery JE, Meyer M, Michelson PF, Mirabal N, Mizuno T, Moiseev AA, Monzani ME, Moretti E, Morselli A, Moskalenko IV, Murgia S, Negro M, Nuss E, Ohsugi T, Omodei N, Orienti M, Orlando E, Ormes JF, Paneque D, Perkins JS, Pesce-Rollins M, Piron F, Pivato G, Porter TA, Racusin JL, Raino S, Rando R, Razzaque S, Reimer A, Reimer O, Reposeur T, Ritz S, Rochester LS, Romani RW, Parkinson PMS, Sgro C, Simone D, Siskind EJ, Smith DA, Spada F, Spandre G, Spinelli P, Suson DJ, Tajima H, Thayer JG, Thayer JB, Thompson DJ, Tibaldo L, Torres DF, Troja E, Uchiyama Y, Venters TM, Vianello G, Wood KS, Wood M, Zaharijas G, Zhu S, Zimmer S, Centre National de la Recherche Scientifique (CNRS)-Université de Bordeaux (UB), Università degli Studi di Roma 'La Sapienza' = Sapienza University [Rome]-Institut Pasteur, Fondation Cenci Bolognetti - Istituto Pasteur Italia, Fondazione Cenci Bolognetti, Réseau International des Instituts Pasteur (RIIP)-Réseau International des Instituts Pasteur (RIIP), Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO), Università degli Studi di Roma 'La Sapienza' [Rome]-Réseau International des Instituts Pasteur (RIIP)-Institut Pasteur, Fondation Cenci Bolognetti - Istituto Pasteur Italia, Fondazione Cenci Bolognetti, and École normale supérieure - Paris (ENS Paris)-École normale supérieure - Paris (ENS Paris)-Centre National de la Recherche Scientifique (CNRS)-École des Ponts ParisTech (ENPC)-École polytechnique (X)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)
Subjects: gamma-ray burst: general, gamma-rays: general, gravitational waves, methods: observational, [PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], media_common.quotation_subject, Astrophysics::High Energy Astrophysical Phenomena, gamma-ray burst: general, observational [methods], FOS: Physical sciences, Astrophysics, general [gamma-ray burst], 01 natural sciences, law.invention, Telescope, ravitational waves, law, Observatory, gamma-ray burst: general – gamma-rays: general – gravitational waves – methods: observational, 0103 physical sciences, gravitational wave, 010303 astronomy & astrophysics, media_common, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, 010308 nuclear & particles physics, Gravitational wave, gamma-rays: general, gravitational waves, methods: observational, Astronomy and Astrophysics, Space and Planetary Science, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy, gamma rays: general, Astronomy and Astrophysic, Gamma-ray burst: general, LIGO, Black hole, Interferometry, Sky, [SDU]Sciences of the Universe [physics], ddc:520, Astrophysics - High Energy Astrophysical Phenomena, general [gamma-rays], Fermi Gamma-ray Space Telescope
Abstract: The astrophysical journal / 2 823(1), L2(2016). doi:10.3847/2041-8205/823/1/L2, The Fermi Large Area Telescope (LAT) has an instantaneous field of view (FoV) covering $\sim 1/5$ of the sky and it completes a survey of the entire sky in high-energy gamma-rays every 3 hr. It enables searches for transient phenomena over timescales from milliseconds to years. Among these phenomena could be electromagnetic counterparts to gravitational wave (GW) sources. In this paper, we present a detailed study of the LAT observations relevant to Laser Interferometer Gravitational-wave Observatory (LIGO) event GW150914, which is the first direct detection of gravitational waves and has been interpreted as being due to the coalescence of two stellar-mass black holes. The localization region for GW150914 was outside the LAT FoV at the time of the GW signal. However, as part of routine survey observations, the LAT observed the entire LIGO localization region within ~70 minutes of the trigger and thus enabled a comprehensive search for a γ-ray counterpart to GW150914. The study of the LAT data presented here did not find any potential counterparts to GW150914, but it did provide limits on the presence of a transient counterpart above 100 MeV on timescales of hours to days over the entire GW150914 localization region., Published by Institute of Physics Publ., London
Published: 2016
Full Text: View/download PDF

23. Development of the Model of Galactic Interstellar Emission for Standard Point-Source Analysis of Fermi Large Area Telescope Data

Author: Xian Hou, S. Rainò, Soebur Razzaque, J. F. Ormes, Matthew Wood, Katsuhiro Hayashi, E. D. Bloom, Gabrijela Zaharijas, Michael Werner, D. Horan, Hiromitsu Takahashi, F. Spada, D. Hadasch, Andrea Albert, T. Kamae, Frederic Piron, Dario Gasparrini, R. Desiante, S. Cutini, S. J. Fegan, Hiroyasu Tajima, Francesco Longo, Jean Ballet, Tsunefumi Mizuno, A. Franckowiak, Miguel A. Sánchez-Conde, Johan Bregeon, L. Latronico, Stefano Ciprini, M. Caragiulo, S. Maldera, Julie McEnery, G. Chiaro, E. Cavazzuti, Q. Remy, T. Jogler, Diego F. Torres, F. Loparco, John W. Hewitt, P. Martin, Eric Charles, M. Kuss, Stefan Funk, D. Landriu, N. Renault, W. B. Focke, Gino Tosti, Gloria Spandre, Olaf Reimer, Gudlaugur Johannesson, Marco Ajello, D. J. Suson, Michael Mayer, Eleonora Troja, Seth Digel, A. Reimer, M. N. Mazziotta, M. Schaal, D. Paneque, Dmitry Malyshev, Liang Li, Guido Barbiellini, P. Fusco, M. Tinivella, Johann Cohen-Tanugi, Nicola Omodei, T. J. Brandt, Francesco Giordano, T. Ohsugi, Elizabeth C. Ferrara, M. Ackermann, S. Buson, R. Claus, G. A. Caliandro, Eric Nuss, L. Di Venere, K. S. Wood, E. Orlando, L. Tibaldo, A. De Angelis, G. Godfrey, Carmelo Sgrò, Riccardo Rando, D. J. Thompson, R. Bonino, F. Gargano, Nestor Mirabal, A. Chekhtman, M. Orienti, J. M. Casandjian, Melissa Pesce-Rollins, C. Cecchi, T. Glanzman, Luca Baldini, Nicola Giglietto, Alice K. Harding, Jingcheng Li, E. J. Siskind, P. A. Caraveo, Persis S. Drell, Giacomo Vianello, F. de Palma, M. N. Lovellette, A. B. Hill, Ronaldo Bellazzini, Janet Conrad, A. Morselli, Stephan Zimmer, I. A. Grenier, M. E. Monzani, J. B. Thayer, Fabio Acero, P. Spinelli, R. A. Cameron, P. Lubrano, Denis Bastieri, Sylvain Guiriec, J. Chiang, Elisabetta Bissaldi, Andrew W. Strong, M. Razzano, Filippo D'Ammando, Alessandro Cuoco, Pascal Bruel, R. Buehler, A. Schulz, Elizabeth Hays, G. Pivato, Peter F. Michelson, Marcello Giroletti, C. Favuzzi, Eugenio Bottacini, Stefan Larsson, Alberto Manfreda, Département de Physique des Particules (ex SPP) (DPP), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire Univers et Particules de Montpellier (LUPM), Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Institut de recherche en astrophysique et planétologie (IRAP), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Fermi-LAT, Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Montpellier 2 - Sciences et Techniques (UM2), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Département de Physique des Particules (ex SPP) (DPhP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), ITA, Acero, F., Ackermann, M., Ajello, M., Albert, A., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Bellazzini, R., Bissaldi, E., Bloom, E. D., Bonino, R., Bottacini, E., Brandt, T. J., Bregeon, J., Bruel, P., Buehler, R., Buson, S., Caliandro, G. A., Cameron, R. A., Caragiulo, M., Caraveo, P. A., Casandjian, J. M., Cavazzuti, E., Cecchi, C., Charles, E., Chekhtman, A., Chiang, J., Chiaro, G., Ciprini, S., Claus, R., Cohen Tanugi, J., Conrad, J., Cuoco, A., Cutini, S., D'Ammando, F., Angelis, A. De, Palma, F. De, Desiante, R., Digel, S. W., Venere, L. Di, Drell, P. S., Favuzzi, C., Fegan, S. J., Ferrara, E. C., Focke, W. B., Franckowiak, A., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Giglietto, N., Giordano, F., Giroletti, M., Glanzman, T., Godfrey, G., Grenier, I. A., Guiriec, S., Hadasch, D., Harding, A. K., Hayashi, K., Hays, E., Hewitt, J. W., Hill, A. B., Horan, D., Hou, X., Jogler, T., Jóhannesson, G., Kamae, T., Kuss, M., Landriu, D., Larsson, S., Latronico, L., Li, J., Li, L., Longo, Francesco, Loparco, F., Lovellette, M. N., Lubrano, P., Maldera, S., Malyshev, D., Manfreda, A., Martin, P., Mayer, M., Mazziotta, M. N., Mcenery, J. E., Michelson, P. F., Mirabal, N., Mizuno, T., Monzani, M. E., Morselli, A., Nuss, E., Ohsugi, T., Omodei, N., Orienti, M., Orlando, E., Ormes, J. F., Paneque, D., Pesce Rollins, M., Piron, F., Pivato, G., Rainò, S., Rando, R., Razzano, M., Razzaque, S., Reimer, A., Reimer, O., Remy, Q., Renault, N., Sánchez Conde, M., Schaal, M., Schulz, A., Sgrò, C., Siskind, E. J., Spada, F., Spandre, G., Spinelli, P., Strong, A. W., Suson, D. J., Tajima, H., Takahashi, H., Thayer, J. B., Thompson, D. J., Tibaldo, L., Tinivella, M., Torres, D. F., Tosti, G., Troja, E., Vianello, G., Werner, M., Wood, K. S., Wood, M., Zaharijas, G., Zimmer, S., Acero F, Ackermann M, Ajello M, Albert A, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bellazzini R, Bissaldi E, Bloom ED, Bonino R, Bottacini E, Brandt TJ, Bregeon J, Bruel P, Buehler R, Buson S, Caliandro GA, Cameron RA, Caragiulo M, Caraveo PA, Casandjian JM, Cavazzuti E, Cecchi C, Charles E, Chekhtman A, Chiang J, Chiaro G, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, Cuoco A, Cutini S, DAmmando F, de Angelis A, de Palma F, Desiante R, Digel SW, Di Venere L, Drell PS, Favuzzi C, Fegan SJ, Ferrara EC, Focke WB, Franckowiak A, Funk S, Fusco P, Gargano F, Gasparrini D, Giglietto N, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grenier IA, Guiriec S, Hadasch D, Harding AK, Hayashi K, Hays E, Hewitt JW, Hill AB, Horan D, Hou X, Jogler T, Johannesson G, Kamae T, Kuss M, Landriu D, Larsson S, Latronico L, Li J, Li L, Longo F, Loparco F, Lovellette MN, Lubrano P, Maldera S, Malyshev D, Manfreda A, Martin P, Mayer M, Mazziotta MN, McEnery JE, Michelson PF, Mirabal N, Mizuno T, Monzani ME, Morselli A, Nuss E, Ohsugi T, Omodei N, Orienti M, Orlando E, Ormes JF, Paneque D, Pesce-Rollins M, Piron F, Pivato G, Raino S, Rando R, Razzano M, Razzaque S, Reimer A, Reimer O, Remy Q, Renault N, Sanchez-Conde M, Schaal M, Schulz A, Sgro C, Siskind EJ, Spada F, Spandre G, Spinelli P, Strong AW, Suson DJ, Tajima H, Takahashi H, Thayer JB, Thompson DJ, Tibaldo L, Tinivella M, Torres DF, Tosti G, Troja E, Vianello G, Werner M, Wood KS, Wood M, Zaharijas G, and Zimmer S
Subjects: gamma rays: diffuse background – gamma rays: general – gamma rays: ISM, Astrophysics, 01 natural sciences, law.invention, Spitzer Space Telescope, law, emission, 010303 astronomy & astrophysics, gamma rays: diffuse background, gamma rays: general, gamma rays: ISM, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, p: spectrum, Galactic Center, photon, nucleon, Gamma rays: diffuse background, Space and Planetary Science, Astronomy and Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, Compton scattering, Point source, Astrophysics::High Energy Astrophysical Phenomena, galaxy: model, FOS: Physical sciences, Cosmic ray, Astrophysics::Cosmology and Extragalactic Astrophysics, p: density, GLAST, emission: model, Telescope, ISM [gamma rays], diffuse background [gamma rays], gas, 0103 physical sciences, structure, Astrophysics::Galaxy Astrophysics, 010308 nuclear & particles physics, bubble, Astronomy and Astrophysic, Galaxy, Interstellar medium, gamma ray, p: cosmic radiation, ddc:520, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], general [gamma rays], Fermi Gamma-ray Space Telescope
Abstract: The astrophysical journal / Supplement series 223(2), 26(2016). doi:10.3847/0067-0049/223/2/26, Most of the celestial γ rays detected by the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope originate from the interstellar medium when energetic cosmic rays interact with interstellar nucleons and photons. Conventional point-source and extended-source studies rely on the modeling of this diffuse emission for accurate characterization. Here, we describe the development of the Galactic Interstellar Emission Model (GIEM), which is the standard adopted by the LAT Collaboration and is publicly available. This model is based on a linear combination of maps for interstellar gas column density in Galactocentric annuli and for the inverse-Compton emission produced in the Galaxy. In the GIEM, we also include large-scale structures like Loop I and the Fermi bubbles. The measured gas emissivity spectra confirm that the cosmic-ray proton density decreases with Galactocentric distance beyond 5 kpc from the Galactic Center. The measurements also suggest a softening of the proton spectrum with Galactocentric distance. We observe that the Fermi bubbles have boundaries with a shape similar to a catenary at latitudes below 20° and we observe an enhanced emission toward their base extending in the north and south Galactic directions and located within ~4° of the Galactic Center., Published by Univ. of Chicago Press11033, Chicago, Ill. [u.a.]
Published: 2016
Full Text: View/download PDF

24. Search for Gamma-Ray Lines towards Galaxy Clusters with the Fermi-LAT

Author: Stephan Zimmer, Brandon Anderson, Miguel A. Sánchez-Conde, Jan Conrad, Regina Caputo, and M. Gustafsson
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Structure formation, 010308 nuclear & particles physics, Milky Way, Astrophysics::High Energy Astrophysical Phenomena, Dark matter, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, Virgo Cluster, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), Intracluster medium, 0103 physical sciences, Coma Cluster, Astrophysics - High Energy Astrophysical Phenomena, 010303 astronomy & astrophysics, Galaxy cluster, Fermi Gamma-ray Space Telescope
Abstract: We report on a search for monochromatic $\gamma$-ray features in the spectra of galaxy clusters observed by the \emph{Fermi} Large Area Telescope. Galaxy clusters are the largest structures in the Universe that are bound by dark matter (DM), making them an important testing ground for possible self-interactions or decays of the DM particles. Monochromatic $\gamma$-ray lines provide a unique signature due to the absence of astrophysical backgrounds and are as such considered a smoking-gun signature for new physics. An unbinned joint likelihood analysis of the sixteen most promising clusters using five years of data at energies between 10 and 400 GeV revealed no significant features. For the case of self-annihilation, we set upper limits on the monochromatic velocity-averaged interaction cross section. These limits are compatible with those obtained from observations of the Galactic Center, albeit weaker due to the larger distance to the studied clusters., Comment: 17 pages, 6 figures, 1 table; minor changes to match version to appear in JCAP, corresponding authors: B. Anderson & S. Zimmer
Published: 2015

25. Using Likelihood for Combined Data Set Analysis

Author: Anderson, Brandon, Chiang, James, Johann Cohen-Tanugi, Conrad, Jan, Alex Drlica-Wagner, Garde, Maja Llena, Stephan Zimmer, Laboratoire Univers et Particules de Montpellier (LUPM), and Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE), [PHYS.ASTR.IM]Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], FOS: Physical sciences, Astrophysics - High Energy Astrophysical Phenomena
Abstract: The joint likelihood is a simple extension of the standard likelihood formalism that enables the estimation of common parameters across disjoint datasets. Joining the likelihood, rather than the data itself, means nuisance parameters can be dealt with independently. Application of this technique, particularly to Fermi-LAT dwarf spheroidal analyses, has already been met with great success. We present a description of the method's general implementation along with a toy Monte-Carlo study of its properties and limitations., Comment: 2014 Fermi Symposium proceedings - eConf C14102.1
Published: 2015
Full Text: View/download PDF

26. SEARCH for EXTENDED GAMMA-RAY EMISSION from the VIRGO GALAXY CLUSTER with FERMI-LAT

Author: R. Buehler, Peter F. Michelson, Marcello Giroletti, Carmelo Sgrò, Riccardo Rando, A. Chekhtman, P. Lubrano, Hiromitsu Takahashi, E. Nuss, David Paneque, M. Kuss, Johan Bregeon, F. Spada, R. Caputo, D. Horan, M. Orienti, A. Morselli, Stefan Larsson, D. Malyshev, Dario Gasparrini, E. Orlando, Andrea Albert, Johann Cohen-Tanugi, Miguel A. Sánchez-Conde, Stefano Ciprini, J. M. Casandjian, Marco Ajello, Francesco Longo, Tesla E. Jeltema, J. B. Thayer, M. N. Mazziotta, L. Di Venere, E. Troja, Seth Digel, Igor V. Moskalenko, Hiroyasu Tajima, Olaf Reimer, Liang Li, Jan Conrad, G. A. Gomez-Vargas, S. Buson, R. Bonino, F. Loparco, Guido Barbiellini, M. Gustafsson, M. Mayer, Elliott D. Bloom, S. Murgia, F. Gargano, Luca Latronico, G. A. Caliandro, A. Franckowiak, I. A. Grenier, M. Caragiulo, S. Maldera, Claudia Cecchi, Ronaldo Bellazzini, S. Rainò, Diego F. Torres, C. Favuzzi, Tsunefumi Mizuno, Eric Charles, J. F. Ormes, E. Cavazzuti, J. Li, K. S. Wood, R. A. Cameron, G. Chiaro, Stefan Funk, T. Ohsugi, Gloria Spandre, Yasushi Fukazawa, T. J. Brandt, A. S. Johnson, S. Cutini, P. Fusco, R. Desiante, Gabrijela Zaharijas, A. De Angelis, John W. Hewitt, G. Tosti, E. J. Siskind, G. Godfrey, T. Jogler, Melissa Pesce-Rollins, Matthew Wood, P. Bruel, Giacomo Vianello, Markus Ackermann, F. de Palma, A. B. Hill, Vahé Petrosian, Luca Baldini, Sylvain Guiriec, W. B. Focke, P. Spinelli, Francesco Giordano, A. Reimer, Eugenio Bottacini, Alberto Manfreda, Elisabetta Bissaldi, G. Pivato, T. Glanzman, Denis Bastieri, T. A. Porter, M. Razzano, Filippo D'Ammando, Keith Bechtol, André Schulz, W. B. Atwood, J. S. Perkins, Nicola Giglietto, M. N. Lovellette, P. A. Caraveo, Persis S. Drell, Stephan Zimmer, M. E. Monzani, Emma Storm, S. J. Fegan, F. Piron, Laboratoire Univers et Particules de Montpellier (LUPM), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Montpellier 2 - Sciences et Techniques (UM2), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Département de Physique des Particules (ex SPP) (DPP), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Fermi-LAT, Université de Montpellier (UM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Ackermann M, Ajello M, Albert A, Atwood WB, Baldini L, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Bissaldi E, Bloom ED, Bonino R, Bottacini E, Brandt TJ, Bregeon J, Bruel P, Buehler R, Buson S, Caliandro GA, Cameron RA, Caputo R, Caragiulo M, Caraveo PA, Casandjian JM, Cavazzuti E, Cecchi C, Charles E, Chekhtman A, Chiaro G, Ciprini S, Cohen-Tanugi J, Conrad J, Cutini S, DAmmando F, de Angelis A, De Palma F, Desiante R, Digel SW, Di Venere L, Drell PS, Favuzzi C, Fegan SJ, Focke WB, Franckowiak A, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Giglietto N, Giordano F, Giroletti M, Glanzman T, Godfrey G, Gomez-Vargas GA, Grenier A, Guiriec S, Gustafsson M, Hewitt JW, Hill AB, Horan D, Jeltema TE, Jogler T, Johnson AS, Kuss M, Larsson S, Latronico L, Li J, Li L, Longo F, Loparco F, Lovellette MN, Lubrano P, Maldera S, Malyshev D, Manfreda A, Mayer M, Mazziotta MN, Michelson PF, Mizuno T, Monzani ME, Morselli A, Moskalenko IV, Murgia S, Nuss E, Ohsugi T, Orienti M, Orlando E, Ormes JF, Paneque D, Perkins JS, Pesce-Rollins M, Petrosian V, Piron F, Pivato G, Porter TA, Raino S, Rando R, Razzano M, Reimer A, Reimer O, Sanchez-Conde M, Schulz A, Sgro C, Siskind EJ, Spada F, Spandre G, Spinelli P, Storm E, Tajima H, Takahashi H, Thayer JB, Torres DF, Tosti G, Troja E, Vianello G, Wood KS, Wood M, Zaharijas G, Zimmer S, Pinzke A, ITA, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Département de Physique des Particules (ex SPP) (DPhP), Ackermann, M., Ajello, M., Albert, A., Atwood, W. B., Baldini, L., Barbiellini, G., Bastieri, D., Bechtol, K., Bellazzini, R., Bissaldi, E., Bloom, E. D., Bonino, R., Bottacini, E., Brandt, T. J., Bregeon, J., Bruel, P., Buehler, R., Buson, S., Caliandro, G. A., Cameron, R. A., Caputo, R., Caragiulo, M., Caraveo, P. A., Casandjian, J. M., Cavazzuti, E., Cecchi, C., Charles, E., Chekhtman, A., Chiaro, G., Ciprini, S., Cohen Tanugi, J., Conrad, J., Cutini, S., D'Ammando, F., Angelis, A. De, Palma, F. De, Desiante, R., Digel, S. W., Venere, L. Di, Drell, P. S., Favuzzi, C., Fegan, S. J., Focke, W. B., Franckowiak, A., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Giglietto, N., Giordano, F., Giroletti, M., Glanzman, T., Godfrey, G., Gomez Vargas, G. A., Grenier, I. A., Guiriec, S., Gustafsson, M., Hewitt, J. W., Hill, A. B., Horan, D., Jeltema, T. E., Jogler, T., Johnson, A. S., Kuss, M., Larsson, S., Latronico, L., Li, J., Li, L., Longo, Francesco, Loparco, F., Lovellette, M. N., Lubrano, P., Maldera, S., Malyshev, D., Manfreda, A., Mayer, M., Mazziotta, M. N., Michelson, P. F., Mizuno, T., Monzani, M. E., Morselli, A., Moskalenko, I. V., Murgia, S., Nuss, E., Ohsugi, T., Orienti, M., Orlando, E., Ormes, J. F., Paneque, D., Perkins, J. S., Pesce Rollins, M., Petrosian, V., Piron, F., Pivato, G., Porter, T. A., Rainó, S., Rando, R., Razzano, M., Reimer, A., Reimer, O., Sánchez Conde, M., Schulz, A., Sgró, C., Siskind, E. J., Spada, F., Spandre, G., Spinelli, P., Storm, E., Tajima, H., Takahashi, H., Thayer, J. B., Torres, D. F., Tosti, G., Troja, E., Vianello, G., Wood, K. S., Wood, M., Zaharijas, G., and Zimmer, S.
Subjects: galaxies: clusters: individual, Nuclear and High Energy Physics, galaxies: clusters: individual (Virgo), Astrophysics::High Energy Astrophysical Phenomena, Dark matter, gamma-rays: galaxies: cluster, background: model, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, cosmic radiation: interaction, GLAST, cross section: annihilation, emission: model, Galactic halo, pressure, High Energy Physics - Phenomenology (hep-ph), galaxy: halo, dark matter: halo, galaxies: cluster [gamma-rays], gamma-rays: galaxies: clusters, gamma-rays: general, Galaxy cluster, Astrophysics::Galaxy Astrophysics, dark matter: angular distribution, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Annihilation, clusters: individual (Virgo) [galaxies], flux: enhancement, Gamma ray, Astronomy and Astrophysics, dark matter: annihilation, star: model, Dark matter halo, High Energy Physics - Phenomenology, VIRGO, gamma ray: emission, Space and Planetary Science, ddc:520, galaxy: cluster, Halo, Astrophysics - High Energy Astrophysical Phenomena, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], general [gamma-rays], Fermi Gamma-ray Space Telescope
Abstract: Galaxy clusters are one of the prime sites to search for dark matter (DM) annihilation signals. Depending on the substructure of the DM halo of a galaxy cluster and the cross sections for DM annihilation channels, these signals might be detectable by the latest generation of $\gamma$-ray telescopes. Here we use three years of Fermi Large Area Telescope (LAT) data, which are the most suitable for searching for very extended emission in the vicinity of nearby Virgo galaxy cluster. Our analysis reveals statistically significant extended emission which can be well characterized by a uniformly emitting disk profile with a radius of 3\deg that moreover is offset from the cluster center. We demonstrate that the significance of this extended emission strongly depends on the adopted interstellar emission model (IEM) and is most likely an artifact of our incomplete description of the IEM in this region. We also search for and find new point source candidates in the region. We then derive conservative upper limits on the velocity-averaged DM pair annihilation cross section from Virgo. We take into account the potential $\gamma$-ray flux enhancement due to DM sub-halos and its complex morphology as a merging cluster. For DM annihilating into $b\overline{b}$, assuming a conservative sub-halo model setup, we find limits that are between 1 and 1.5 orders of magnitude above the expectation from the thermal cross section for $m_{\mathrm{DM}}\lesssim100\,\mathrm{GeV}$. In a more optimistic scenario, we exclude $\langle \sigma v \rangle\sim3\times10^{-26}\,\mathrm{cm^{3}\,s^{-1}}$ for $m_{\mathrm{DM}}\lesssim40\,\mathrm{GeV}$ for the same channel. Finally, we derive upper limits on the $\gamma$-ray-flux produced by hadronic cosmic-ray interactions in the inter cluster medium. We find that the volume-averaged cosmic-ray-to-thermal pressure ratio is less than $\sim6\%$., Comment: 15 pages, 11 figures, 4 tables, accepted for publication in ApJ; corresponding authors: T. Jogler, S. Zimmer & A. Pinzke
Published: 2015
Full Text: View/download PDF

27. Galaxy Clusters with the Fermi-LAT: Status and Implications for Cosmic Rays and Dark Matter Physics

Author: Stephan Zimmer
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE), Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics::Galaxy Astrophysics
Abstract: Galaxy clusters are the most massive systems in the known universe. They host relativistic cosmic ray populations and are thought to be gravitationally bound by large amounts of Dark Matter, which under the right conditions could yield to a detectable $\gamma$-ray flux. Prior to the launch of the Fermi satellite, predictions were optimistic that Galaxy clusters would be established as $\gamma$-ray bright objects by observations through its prime instrument, the Large Area Telescope (LAT). Yet, despite numerous efforts, even a single cluster detection is still pending., Comment: 2014 Fermi Symposium proceedings - eConf C14102.1; 4 pages, 3 figures
Published: 2015
Full Text: View/download PDF

28. Reconstruction software of the silicon tracker of DAMPE mission

Author: Xin Wu, Andrii Tykhonov, Stephan Zimmer, and V. Gallo
Subjects: Astroparticle physics, History, Silicon, Physics::Instrumentation and Detectors, Computer science, business.industry, Detector, ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, chemistry.chemical_element, CAD, Reconstruction algorithm, Computer Science Applications, Education, Software, chemistry, Key (cryptography), Computer vision, Artificial intelligence, business, Energy (signal processing), ComputingMethodologies_COMPUTERGRAPHICS
Abstract: DAMPE is a satellite-borne experiment aimed to probe astroparticle physics in the GeV-TeV energy range. The Silicon tracker (STK) is one of the key components of DAMPE, which allows the reconstruction of trajectories (tracks) of detected particles. The non-negligible amount of material in the tracker poses a challenge to its reconstruction and alignment. In this paper we describe methods to address this challenge. We present the track reconstruction algorithm and give insight into the alignment algorithm. We also present our CAD-to-GDML converter, an in-house tool for implementing detector geometry in the software from the CAD drawings of the detector.
Published: 2017
Full Text: View/download PDF

29. Dark matter and fundamental physics with the Cherenkov Telescope Array

Author: Ullrich Schwanke, Stephan Zimmer, Dimitrios Emmanoulopoulos, Tarek M. Hassan, A. Stamerra, A. Gonzalez-Munoz, H.-S. Zechlin, M. K. Daniel, Simon Henry Connell, Miguel A. Sánchez-Conde, G. Spengler, Aion Viana, J. Bolmont, Jose Luis Contreras, Juan Abel Barrio, Pierre Brun, E. Birsin, Heidi Sandaker, Mattia Fornasa, S. Colafrancesco, Nestor Mirabal, Daniel Nieto, Emmanuel Moulin, C. Jahn, Abelardo Moralejo, Jan Conrad, J. F. Glicenstein, M. Gaug, Dieter Horns, Rachid Mazini, Joachim Ripken, A. Jacholkowska, Michele Doro, M., Doro, J., Conrad, D., Emmanoulopoulo, M. A., Sanchez Conde, J. A., Barrio, E., Birsin, J., Bolmont, P., Brun, S., Colafrancesco, S. H., Connell, J. L., Contrera, M. K., Daniel, M., Fornasa, M., Gaug, J. F., Glicenstein, A., Gonzalez Munoz, T., Hassan, D., Horn, A., Jacholkowska, C., Jahn, R., Mazini, N., Mirabal, A., Moralejo, E., Moulin, D., Nieto, J., Ripken, H., Sandaker, U., Schwanke, G., Spengler, A., Stamerra, A., Viana, H. . ., S., S., Zimmer, Cta, Consortium, Acharya, B. S., Actis, M., Aghajani, T., and Bissaldi, Elisabetta
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO), Cold dark matter, Magnetic monopoles, Milky Way, Astrophysics::High Energy Astrophysical Phenomena, Dark matter, Matematikk og naturvitenskap: 400::Fysikk: 430::Astrofysikk, astronomi: 438 [VDP], FOS: Physical sciences, Galaxy clusters, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Lorentz invariance violations, 01 natural sciences, dark matter, law.invention, High-energy astrophysics instrumentation, Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Cosmology and Extragalactic Astrophysics, High Energy Physics - Phenomenology, Gravitational waves, Telescope, High Energy Physics - Phenomenology (hep-ph), law, Dwarf satellite galaxies, Galactic centre, Galactic halo, galaxy clusters, 0103 physical sciences, Neutrino, Instrumentation and Methods for Astrophysics (astro-ph.IM), 010303 astronomy & astrophysics, Axion, Axion-like particles, Physics, CTA, 010308 nuclear & particles physics, Dwarf satellite galaxie, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy, Astronomy and Astrophysics, Cherenkov Telescope Array, Galaxy, Extragalactic background light, 13. Climate action, Mathematics and natural scienses: 400::Physics: 430::Astrophysics, astronomy: 438 [VDP], Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: The Cherenkov Telescope Array (CTA) is a project for a next-generation observatory for very high energy (GeV-TeV) ground-based gamma-ray astronomy, currently in its design phase, and foreseen to be operative a few years from now. Several tens of telescopes of 2-3 different sizes, distributed over a large area, will allow for a sensitivity about a factor 10 better than current instruments such as H.E.S.S, MAGIC and VERITAS, an energy coverage from a few tens of GeV to several tens of TeV, and a field of view of up to 10. In the following study, we investigate the prospects for CTA to study several science questions that can profoundly influence our current knowledge of fundamental physics. Based on conservative assumptions for the performance of the different CTA telescope configurations currently under discussion, we employ a Monte Carlo based approach to evaluate the prospects for detection and characterisation of new physics with the array.First, we discuss CTA prospects for cold dark matter searches, following different observational strategies: in dwarf satellite galaxies of the Milky Way, which are virtually void of astrophysical background and have a relatively well known dark matter density; in the region close to the Galactic Centre, where the dark matter density is expected to be large while the astrophysical background due to the Galactic Centre can be excluded; and in clusters of galaxies, where the intrinsic flux may be boosted significantly by the large number of halo substructures. The possible search for spatial signatures, facilitated by the larger field of view of CTA, is also discussed. Next we consider searches for axion-like particles which, besides being possible candidates for dark matter may also explain the unexpectedly low absorption by extragalactic background light of gamma-rays from very distant blazars. We establish the axion mass range CTA could probe through observation of long-lasting flares in distant sources. Simulated lightcurves of flaring sources are also used to determine the sensitivity to violations of Lorentz invariance by detection of the possible delay between the arrival times of photons at different energies. Finally, we mention searches for other exotic physics with CTA. © 2012 Elsevier B.V. All rights reserved.
Published: 2013

30. ERRATUM: 'FERMI LARGE AREA TELESCOPE STUDY OF COSMIC-RAYS AND THE INTERSTELLAR MEDIUM IN NEARBY MOLECULAR CLOUDS' (2012, ApJ, 755, 22)

Author: P. Lubrano, Denis Bastieri, Hartmut Sadrozinski, Sho Nishino, J. Lande, Sylvain Guiriec, Charles D. Dermer, F. Gargano, Rodrigo Nemmen, A. Chekhtman, D. Horan, Tadayuki Takahashi, M. Tinivella, M. Roth, Francesco Longo, Elizabeth C. Ferrara, W. B. Focke, P. Spinelli, Pierrick Martin, Francesco Giordano, Igor V. Moskalenko, I. A. Grenier, Olaf Reimer, A. Tramacere, E. J. Siskind, Takaaki Tanaka, C. Favuzzi, Stephan Zimmer, J. H. Panetta, Alice Allafort, Gloria Spandre, Markus Ackermann, R. A. Cameron, T. J. Brandt, P. Bruel, S. Murgia, Johann Cohen-Tanugi, T. L. Usher, Hiromitsu Takahashi, F. Piron, T. A. Porter, G. Busetto, Brian L Winer, G. A. Caliandro, J. M. Casandjian, Yasunobu Uchiyama, M. Razzano, Y. Hanabata, Masanori Ohno, A. Morselli, V. Vasileiou, V. Vitale, Stefan Funk, M. E. Monzani, E. Orlando, Zhenwei Yang, G. Pivato, A. A. Moiseev, R. Claus, J. Bregeon, Carmelo Sgrò, Riccardo Rando, E. Nuss, David Paneque, X. Hou, M. Kuss, T. Kamae, T. Ohsugi, Eleonora Troja, Miranda Jackson, Alice K. Harding, A. W. Borgland, A. De Angelis, T. Uehara, L. Falletti, G. Tosti, Eugenio Bottacini, Daniel Sánchez, S. J. Fegan, B. Berenji, M. H. Grondin, Gudlaugur Johannesson, Seth Digel, F. Loparco, Giacomo Vianello, O. Tibolla, W. Mitthumsiri, M. Naumann-Godo, Claudia Cecchi, Jürgen Knödlseder, Justin Vandenbroucke, R. E. Hughes, Eric Charles, Andrew W. Strong, Guido Barbiellini, Alex Drlica-Wagner, K. Hayashi, D. J. Suson, Nicola Giglietto, Keith Bechtol, Shiu-Hang Lee, Marianne Lemoine-Goumard, Dario Gasparrini, A. P. Waite, M. Ozaki, C. Monte, Ronaldo Bellazzini, T. Glanzman, M. N. Lovellette, P. A. Caraveo, Persis S. Drell, P. Wang, Nicola Omodei, D. J. Thompson, M. Brigida, Emanuele Bonamente, T. Sada, Jun Kataoka, S. Germani, K. S. Wood, A. S. Johnson, S. Larsson, Jay P. Norris, James Chiang, Roger Blandford, S. Rainò, Tsunefumi Mizuno, J. E. Grove, Yasushi Fukazawa, P. Fusco, Hiroaki Yamamoto, A. Reimer, J. F. Ormes, J. G. Thayer, J. Mehault, Carla Sbarra, Julie McEnery, Marco Ajello, J. B. Thayer, L. Tibaldo, S. Buson, D. Parent, Yasuo Fukui, Melissa Pesce-Rollins, Luca Baldini, M. Pierbattista, Diego F. Torres, Mn Mazziotta, C. Romoli, E. Do Couto E Silva, Jean Ballet, Stefano Ciprini, Elliott D. Bloom, R. Buehler, Peter F. Michelson, Marcello Giroletti, Hideaki Katagiri, F. D'Ammando, Akira Okumura, Daniela Hadasch, Jan Conrad, G. Godfrey, F. de Palma, and Ryosuke Itoh
Subjects: Physics, Molecular cloud, Astronomy, Astronomy and Astrophysics, Cosmic ray, Astrophysics, law.invention, Interstellar medium, Telescope, Space and Planetary Science, law, ddc:520, Fermi Gamma-ray Space Telescope
Abstract: The astrophysical journal 778(1), 82 (2013). doi:10.1088/0004-637X/778/1/82, This is an Erratum for the article 2012 ApJ 755 22, Published by Univ.11032, Chicago, Ill. [u.a.]
Published: 2013
Full Text: View/download PDF

31. Determination of the Point-spread Function for the Fermi Large Area Telescope from On-orbit Data and Limits on Pair Halos of Active Galactic Nuclei

Author: G. Busetto, Brian L Winer, S. Cutini, A. A. Moiseev, Katsuaki Asano, Francesco Longo, Gudlaugur Johannesson, F. Loparco, E. Do Couto E Silva, W. Mitthumsiri, T. A. Porter, A. P. Waite, T. J. Brandt, Jean Ballet, Stefan Funk, Daniel Sánchez, Claudia Lavalley, Sho Nishino, Alex Drlica-Wagner, Justin Vandenbroucke, T. E. Stephens, A. Morselli, V. Vitale, Jeffrey D. Scargle, P. Fusco, Stefano Ciprini, Igor V. Moskalenko, Matthew Kerr, A. W. Borgland, I. A. Grenier, S. Germani, T. Ohsugi, Eleonora Troja, Miranda Jackson, Nicola Omodei, Guido Barbiellini, S. J. Fegan, Olaf Reimer, Zhenwei Yang, Elliott D. Bloom, G. Godfrey, Kent S. Wood, T. Jogler, Carmelo Sgrò, Riccardo Rando, Soebur Razzaque, Jay P. Norris, M. Razzano, P. Fortin, L. S. Rochester, C. Favuzzi, V. Vasileiou, R. Claus, Matthew Wood, Stephan Zimmer, J. F. Ormes, N. Gehrels, James Chiang, Hiroyasu Tajima, Gino Tosti, Jan Conrad, F. de Palma, R. E. Hughes, E. Wallace, Dario Gasparrini, Patrick Weltevrede, E. Nuss, Paola Grandi, P. Lubrano, Hiromitsu Takahashi, M. Brigida, Sylvain Chaty, A. Chekhtman, David Paneque, Claudia Cecchi, S. Rainò, J. G. Thayer, T. Kamae, Tsunefumi Mizuno, Randall P. Johnson, Rodrigo Nemmen, R. Dubois, E. Orlando, J. M. Casandjian, D. Horan, F. D'Ammando, W. B. Focke, M. Kuss, C. Monte, M. E. Monzani, Gloria Spandre, P. Spinelli, M. N. Mazziotta, Jun Kataoka, Pascal Bruel, J. Mehault, Emanuele Bonamente, R. Buehler, J. E. Grove, S. Larsson, T. L. Usher, Francesco Giordano, D. J. Thompson, Daniela Hadasch, M. Roth, Yasushi Fukazawa, T. H. Burnett, A. S. Johnson, M. Orienti, S. Murgia, O. Tibolla, Benoit Lott, Peter F. Michelson, Marcello Giroletti, Takaaki Tanaka, F. Piron, A. Snyder, Keith Bechtol, Johan Bregeon, Johann Cohen-Tanugi, Alice Allafort, Roberto Mignani, Eric Charles, Julie McEnery, Morihiro Hayashida, E. Hays, Steven Ritz, D. J. Suson, C. C. Cheung, W. McConville, L. C. Reyes, Marco Ajello, J. B. Thayer, M. Naumann-Godo, L. Tibaldo, W. B. Atwood, J. S. Perkins, Nicola Giglietto, F. Gargano, Luca Latronico, G. A. Caliandro, H. Poon, S. Colafrancesco, M. N. Lovellette, P. A. Caraveo, Persis S. Drell, M. Tinivella, Elizabeth C. Ferrara, V. Pelassa, E. J. Siskind, J. H. Panetta, Markus Ackermann, A. N. Cillis, R. A. Cameron, Luca Baldini, M. Pierbattista, Denis Bastieri, A. von Kienlin, C. Romoli, J. Lande, Sylvain Guiriec, A. Reimer, S. Buson, P. M. Saz Parkinson, Suk-Han Lee, Melissa Pesce-Rollins, T. Glanzman, Jürgen Knödlseder, G. Pivato, Eugenio Bottacini, Charles D. Dermer, X. Hou, Giacomo Vianello, Ronaldo Bellazzini, Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Commonwealth Scientific and Industrial Research Organisation [Canberra] (CSIRO), Istituto Nazionale di Fisica Nucleare, sezione di Bari (INFN, sezione di Bari), Istituto Nazionale di Fisica Nucleare (INFN), GLAST, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Univers et Particules de Montpellier (LUPM), Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Ackermann, M., Ajello, M., Allafort, A., Asano, K., Atwood, W. B., Baldini, L., Ballet, J., BARBIELLINI AMIDEI, Guido, Bastieri, D., Bechtol, K., Bellazzini, R., Bloom, E. D., Bonamente, E., Borgland, A. W., Bottacini, E., Brandt, T. J., Bregeon, J., Brigida, M., Bruel, P., Buehler, R., Burnett, T. H., Busetto, G., Buson, S., Caliandro, G. A., Cameron, R. A., Caraveo, P. A., Casandjian, J. M., Cecchi, C., Charles, E., Chaty, S., Chekhtman, A., Cheung, C. C., Chiang, J., Cillis, A. N., Ciprini, S., Claus, R., Cohen Tanugi, J., Colafrancesco, S., Conrad, J., Cutini, S., D'Ammando, F., de Palma, F., Dermer, C. D., Silva, E. do Couto e., Drell, P. S., Drlica Wagner, A., Dubois, R., Favuzzi, C., Fegan, S. J., Ferrara, E. C., Focke, W. B., Fortin, P., Fukazawa, Y., Funk, S., Fusco, P., Gargano, F., Gasparrini, D., Gehrels, N., Germani, S., Giglietto, N., Giordano, F., Giroletti, M., Glanzman, T., Godfrey, G., Grandi, P., Grenier, I. A., Grove, J. E., Guiriec, S., Hadasch, D., Hayashida, M., Hays, E., Horan, D., Hou, X., Hughes, R. E., Jackson, M. S., Jogler, T., Jóhannesson, G., Johnson, R. P., Johnson, A. S., Kamae, T., Kataoka, J., Kerr, M., Knödlseder, J., Kuss, M., Lande, J., Larsson, S., Latronico, L., Lavalley, C., Lee, S. H., Longo, Francesco, Loparco, F., Lott, B., Lovellette, M. N., Lubrano, P., Mazziotta, M. N., Mcconville, W., Mcenery, J. E., Mehault, J., Michelson, P. F., Mignani, R. P., Mitthumsiri, W., Mizuno, T., Moiseev, A. A., Monte, C., Monzani, M. E., Morselli, A., Moskalenko, I. V., Murgia, S., Naumann Godo, M., Nemmen, R., Nishino, S., Norris, J. P., Nuss, E., Ohsugi, T., Omodei, N., Orienti, M., Orlando, E., Ormes, J. F., Paneque, D., Panetta, J. H., Pelassa, V., Perkins, J. S., Pesce Rollins, M., Pierbattista, M., Piron, F., Pivato, G., Poon, H., Porter, T. A., Rainò, S., Rando, R., Razzano, M., Razzaque, S., Reimer, A., Reimer, O., Reyes, L. C., Ritz, S., Rochester, L. S., Romoli, C., Roth, M., Sanchez, D. A., Saz Parkinson, P. M., Scargle, J. D., Sgrò, C., Siskind, E. J., Snyder, A., Spandre, G., Spinelli, P., Stephens, T. E., Suson, D. J., Tajima, H., Takahashi, H., Tanaka, T., Thayer, J. G., Thayer, J. B., Thompson, D. J., Tibaldo, L., Tibolla, O., Tinivella, M., Tosti, G., Troja, E., Usher, T. L., Vandenbroucke, J., Vasileiou, V., Vianello, G., Vitale, V., von Kienlin, A., Waite, A. P., Wallace, E., Weltevrede, P., Winer, B. L., Wood, K. S., Wood, M., Yang, Z., Zimmer, S., Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Ackermann M, Ajello M, Allafort A, Asano K, Atwood WB, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Bloom ED, Bonamente E, Borgland AW, Bottacini E, Brandt TJ, Bregeon J, Brigida M, Bruel P, Buehler R, Burnett TH, Busetto G, Buson S, Caliandro GA, Cameron RA, Caraveo PA, Casandjian JM, Cecchi C, Charles E, Chaty S, Chekhtman A, Cheung CC, Chiang J, Cillis AN, Ciprini S, Claus R, Cohen-Tanugi J, Colafrancesco S, Conrad J, Cutini S, DAmmando F, de Palma F, Dermer CD, Silva EDE, Drell S, Drlica-Wagner A, Dubois R, Favuzzi C, Fegan SJ, Ferrara EC, Focke WB, Fortin P, Fukazawa Y, Funk S, Fusco P, Gargano F, Gasparrini D, Gehrels N, Germani S, Giglietto N, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grandi P, Grenier IA, Grove JE, Guiriec S, Hadasch D, Hayashida M, Hays E, Horan D, Hou X, Hughes RE, Jackson MS, Jogler T, Johannesson G, Johnson RP, Johnson AS, Kamae T, Kataoka J, Kerr M, Knodlseder J, Kuss M, Lande J, Larsson S, Latronico L, Lavalley C, Lee SH, Longo F, Loparco F, Lott B, Lovellette MN, Lubrano P, Mazziotta MN, McConville W, McEnery JE, Mehault J, Michelson PF, Mignani RP, Mitthumsiri W, Mizuno T, Moiseev AA, Monte C, Monzani ME, Morselli A, Moskalenko IV, Murgia S, Naumann-Godo M, Nemmen R, Nishino S, Norris JP, Nuss E, Ohsugi T, Omodei N, Orienti M, Orlando E, Ormes JF, Paneque D, Panetta JH, Pelassa V, Perkins JS, Pesce-Rollins M, Pierbattista M, Piron F, Pivato G, Poon H, Porter TA, Raino S, Rando R, Razzano M, Razzaque S, Reimer A, Reimer O, Reyes LC, Ritz S, Rochester LS, Romoli C, Roth M, Sanchez DA, Parkinson PMS, Scargle JD, Sgro C, Siskind EJ, Snyder A, Spandre G, Spinelli P, Stephens TE, Suson DJ, Tajima H, Takahashi H, Tanaka T, Thayer JG, Thayer JB, Thompson DJ, Tibaldo L, Tibolla O, Tinivella M, Tosti G, Troja E, Usher TL, Vandenbroucke J, Vasileiou V, Vianello G, Vitale V, von Kienlin A, Waite AP, Wallace E, Weltevrede P, Winer BL, Wood KS, Wood M, Yang Z, Zimmer S, National Institute for Nuclear Physics (INFN), and Université de Montpellier (UM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Ciencias Físicas, EXTRAGALACTIC MAGNETIC-FIELDS, halo [galaxies], galaxies: halos, Astrophysics, 01 natural sciences, galaxies, [gamma rays], law.invention, Spitzer Space Telescope, law, 1ES 0229+200, SPACE-TELESCOPE, 010303 astronomy & astrophysics, Physics, TEV BLAZARS, detector [instrumentation], [SDU.ASTR.HE]Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Astrophysics::Instrumentation and Methods for Astrophysics, detectors, intergalactic medium [instrumentation], VHE GAMMA-RAYS, galaxies: active – galaxies: halos – gamma rays: galaxies – instrumentation: detectors – intergalactic medium, halos [galaxies], active [galaxies], intergalactic medium, Astrophysics - High Energy Astrophysical Phenomena, CIENCIAS NATURALES Y EXACTAS, Point spread function, [PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Active galactic nucleus, Astrophysics::High Energy Astrophysical Phenomena, galaxies: active, Astrophysics::Cosmology and Extragalactic Astrophysics, Telescope, 0103 physical sciences, gamma rays: galaxies, instrumentation: detectors, galaxie [gamma rays], Blazar, SOURCE CATALOG, Astrophysics::Galaxy Astrophysics, BACKGROUND LIGHT, 010308 nuclear & particles physics, Astronomy, CONSTRAINTS, Astronomy and Astrophysics, Quasar, PULSAR, Galaxy, DISCOVERY, Astronomía, Space and Planetary Science, ddc:520, Fermi Gamma-ray Space Telescope
Abstract: The astrophysical journal 765(1), 54 (2013). doi:10.1088/0004-637X/765/1/54, The Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope is a pair-conversion telescope designed to detect photons with energies from ≈20 MeV to >300 GeV. The pre-launch response functions of the LAT were determined through extensive Monte Carlo simulations and beam tests. The point-spread function (PSF) characterizing the angular distribution of reconstructed photons as a function of energy and geometry in the detector is determined here from two years of on-orbit data by examining the distributions of γ rays from pulsars and active galactic nuclei (AGNs). Above 3 GeV, the PSF is found to be broader than the pre-launch PSF. We checked for dependence of the PSF on the class of γ-ray source and observation epoch and found none. We also investigated several possible spatial models for pair-halo emission around BL Lac AGNs. We found no evidence for a component with spatial extension larger than the PSF and set upper limits on the amplitude of halo emission in stacked images of low- and high-redshift BL Lac AGNs and the TeV blazars 1ES0229+200 and 1ES0347–121, Published by Univ.11032, Chicago, Ill. [u.a.]
Published: 2013
Full Text: View/download PDF

32. Pass 8: Toward the Full Realization of the Fermi-LAT Scientific Potential

Author: Atwood, W., Andrea Albert, Luca Baldini, Tinivella, M., Bregeon, J., Melissa Pesce-Rollins, Carmelo Sgro', Bruel, P., Charles, E., Alex Drlica-Wagner, Franckowiak, A., Jogler, T., Rochester, L., Tracy Usher, Wood, M., Johann Cohen-Tanugi, and Stephan Zimmer
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE), FOS: Physical sciences, Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, Instrumentation and Methods for Astrophysics (astro-ph.IM)
Abstract: The event selection developed for the Fermi Large Area Telescope before launch has been periodically updated to reflect the constantly improving knowledge of the detector and the environment in which it operates. Pass 7, released to the public in August 2011, represents the most recent major iteration of this incremental process. In parallel, the LAT team has undertaken a coherent long-term effort aimed at a radical revision of the entire event-level analysis, based on the experience gained in the prime phase of the mission. This includes virtually every aspect of the data reduction process, from the simulation of the detector to the event reconstruction and the background rejection. The potential improvements include (but are not limited to) a significant reduction in background contamination coupled with an increased effective area, a better point-spread function, a better understanding of the systematic uncertainties and an extension of the energy reach for the photon analysis below 100 MeV and above a few hundred GeV. We present an overview of the work that has been done or is ongoing and the prospects for the near future., Comment: 6 pages, 1 figure, 2012 Fermi Symposium proceedings - eConf C121028
Published: 2013
Full Text: View/download PDF

33. NEW FERMI-LAT EVENT RECONSTRUCTION REVEALS MORE HIGH-ENERGY GAMMA RAYS FROM GAMMA-RAY BURSTS

Author: T. L. Usher, Soebur Razzaque, Francesco Longo, P. Bruel, W. B. Atwood, Jonathan Granot, Stephan Zimmer, Melissa Pesce-Rollins, A. Chekhtman, L. S. Rochester, Carmelo Sgrò, Luca Baldini, Johan Bregeon, Nicola Omodei, Alex Drlica-Wagner, Johann Cohen-Tanugi, M. Tinivella, W. B., Atwood, L., Baldini, J., Bregeon, P., Bruel, A., Chekhtman, J., Cohen Tanugi, A., Drlica Wagner, J., Granot, Longo, Francesco, N., Omodei, M., Pesce Rollin, S., Razzaque, L. S., Rochester, C., Sgrò, M., Tinivella, T. L., Usher, and S., Zimmer
Subjects: Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics, astroparticle physics, cosmology: observations, gamma rays: general, methods: data analysis, symbols.namesake, data analysis [methods], Event reconstruction, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, GRB 080916C, Gamma ray, astroparticle physic, Astronomy and Astrophysics, Redshift, Lorentz factor, Extragalactic background light, Space and Planetary Science, symbols, Astrophysics - High Energy Astrophysical Phenomena, Gamma-ray burst, general [gamma rays], observation [cosmology], Fermi Gamma-ray Space Telescope
Abstract: Based on the experience gained during the four and a half years of the mission, the Fermi -LAT collaboration has undertaken a comprehensive revision of the event-level analysis going under the name of Pass 8. Although it is not yet finalized, we can test the improvements in the new event reconstruction with the special case of the prompt phase of bright Gamma-Ray Bursts (GRBs), where the signal to noise ratio is large enough that loose selection cuts are sufficient to identify gamma- rays associated with the source. Using the new event reconstruction, we have re-analyzed ten GRBs previously detected by the LAT for which an x-ray/optical follow-up was possible and found four new gamma rays with energies greater than 10 GeV in addition to the seven previously known. Among these four is a 27.4 GeV gamma-ray from GRB 080916C, which has a redshift of 4.35, thus making it the gamma ray with the highest intrinsic energy (147 GeV) detected from a GRB. We present here the salient aspects of the new event reconstruction and discuss the scientific implications of these new high-energy gamma rays, such as constraining extragalactic background light models, Lorentz invariance violation (LIV) tests, the prompt emission mechanism and the bulk Lorentz factor of the emitting region., Comment: 6 pages, 2 figures, accepted by ApJ
Published: 2013

34. Extending the Fermi-LAT Data Processing Pipeline to the Grid

Author: Claudia Lavalley, Andrei Tsaregorodtsev, Stephan Zimmer, T. Glanzman, Tony Johnson, and Luisa Arrabito
Subjects: FOS: Computer and information sciences, History, Data processing, business.industry, Computer science, Interface (computing), Real-time computing, FOS: Physical sciences, Grid, Pipeline (software), Computer Science Applications, Education, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Software, Data acquisition, Computer Science - Distributed, Parallel, and Cluster Computing, Data quality, Distributed, Parallel, and Cluster Computing (cs.DC), business, Astrophysics - Instrumentation and Methods for Astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM), Fermi Gamma-ray Space Telescope
Abstract: The Data Handling Pipeline ("Pipeline") has been developed for the Fermi Gamma-Ray Space Telescope (Fermi) Large Area Telescope (LAT) which launched in June 2008. Since then it has been in use to completely automate the production of data quality monitoring quantities, reconstruction and routine analysis of all data received from the satellite and to deliver science products to the collaboration and the Fermi Science Support Center. Aside from the reconstruction of raw data from the satellite (Level 1), data reprocessing and various event-level analyses are also reasonably heavy loads on the pipeline and computing resources. These other loads, unlike Level 1, can run continuously for weeks or months at a time. In addition it receives heavy use in performing production Monte Carlo tasks. The software comprises web-services that allow online monitoring and provides charts summarizing work flow aspects and performance information. The server supports communication with several batch systems such as LSF and BQS and recently also Sun Grid Engine and Condor. This is accomplished through dedicated job control services that for Fermi are running at SLAC and the other computing site involved in this large scale framework, the Lyon computing center of IN2P3. While being different in the logic of a task, we evaluate a separate interface to the Dirac system in order to communicate with EGI sites to utilize Grid resources, using dedicated Grid optimized systems rather than developing our own. (abstract abridged), This is an author-created, un-copyedited version of an article accepted for publication in Journal of Physics: Conference Series. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at http://dx.doi.org/10.1088/1742-6596/396/3/032121
Published: 2012

35. FERMI LARGE AREA TELESCOPE OBSERVATIONS OF THE SUPERNOVA REMNANT G8.7-0.1

Author: Hartmut Sadrozinski, R. A. Cameron, Stefano Ciprini, Marco Ajello, J. B. Thayer, Sho Nishino, Jay P. Norris, Akira Okumura, T. A. Porter, Pascal Bruel, T. Ohsugi, Eleonora Troja, Gloria Spandre, Gudlaugur Johannesson, Elliott D. Bloom, Alex Drlica-Wagner, K. Hayashi, D. Parent, S. Buson, E. Hays, R. Buehler, Luca Latronico, T. Glanzman, Johann Cohen-Tanugi, S. Murgia, Stephan Zimmer, Roger Blandford, F. Piron, Peter F. Michelson, Marcello Giroletti, Justin Vandenbroucke, M. Roth, Guido Barbiellini, Nicola Omodei, G. Godfrey, Zhenwei Yang, Carmelo Sgrò, Riccardo Rando, Yasuo Fukui, A. De Angelis, G. Tosti, R. Dubois, W. B. Focke, V. Pelassa, E. Nuss, David Paneque, M. Ohno, M. E. Monzani, M. Kuss, Alice K. Harding, P. Spinelli, Francesco Giordano, Hideaki Katagiri, F. de Palma, Melissa Pesce-Rollins, A. Van Etten, Igor V. Moskalenko, M. Frailis, Elizabeth C. Ferrara, G. A. Caliandro, Jonathan F. Ormes, Olaf Reimer, E. Do Couto E Silva, B. Berenji, Ryo Yamazaki, Giacomo Vianello, A. Morselli, Hiromitsu Takahashi, V. Vitale, D. Hadasch, Keith Bechtol, S. Rainò, M. Brigida, Tsunefumi Mizuno, Hajimu Yasuda, Francesco Longo, C. Favuzzi, Jürgen Knödlseder, E. Orlando, Takeshi Nakamori, J. M. Casandjian, A. Tramacere, R. Claus, Hiroaki Yamamoto, Hiroyasu Tajima, J. Bregeon, Ryosuke Itoh, Nicola Giglietto, P. L. Nolan, J. E. Grove, Yasushi Fukazawa, Takaaki Tanaka, A. P. Waite, S. Germani, Brian L Winer, Shiu-Hang Lee, Ronaldo Bellazzini, Andrea Lionetto, M. N. Lovellette, Dario Gasparrini, Diego F. Torres, Hidetoshi Kubo, P. A. Caraveo, Alice Allafort, P. Fusco, Persis S. Drell, Paolo Giommi, C. Monte, T. Kamae, V. Vasileiou, J. G. Thayer, T. L. Usher, A. A. Moiseev, Yasunobu Uchiyama, Jun Kataoka, S. J. Fegan, J. Mehault, Luca Baldini, A. Reimer, M. Naumann-Godo, Charles D. Dermer, E. J. Siskind, M. Pierbattista, A. S. Johnson, S. Cutini, Claudia Cecchi, F. Loparco, P. Wang, Denis Bastieri, Emanuele Bonamente, J. Lande, Sylvain Guiriec, K. S. Wood, L. Tibaldo, O. Tibolla, N. Vilchez, Y. Hanabata, F. Gargano, P. D. Smith, T. Reposeur, A. W. Borgland, T. Uehara, M. Ziegler, M. N. Mazziotta, A. Chekhtman, P. Lubrano, Eric Charles, D. J. Suson, Jean Ballet, Ajello, M., Allafort, A., Baldini, L., Ballet, J., Barbiellini, G., Bastieri, D., Bechtol, K., Bellazzini, R., Berenji, B., Blandford, R. D., Bloom, E. D., Bonamente, E., Borgland, A. W., Bregeon, J., Brigida, M., Bruel, P., Buehler, R., Buson, S., Caliandro, G. A., Cameron, R. A., Caraveo, P. A., Casandjian, J. M., Cecchi, C., Charles, E., Chekhtman, A., Ciprini, S., Claus, R., Cohen Tanugi, J., Cutini, S., Angelis, A., Palma, F., Dermer, C. D., E. d. C., Drell, P. S., Drlica Wagner, A., Dubois, R., Favuzzi, C., Fegan, S. J., Ferrara, E. C., Focke, W. B., Frailis, M., Fukazawa, Y., Fukui, Y., Fusco, P., Gargano, F., Gasparrini, D., Germani, S., Giglietto, N., Giommi, P., Giordano, F., Giroletti, M., Glanzman, T., Godfrey, G., Grove, J. E., Guiriec, S., Hadasch, D., Hanabata, Y., Harding, A. K., Hayashi, K., Hays, E., Itoh, R., Johannesson, G., Johnson, A. S., Kamae, T., Katagiri, H., Kataoka, J., Kn\odlseder, J., Kubo, H., Kuss, M., Lande, J., Latronico, L., Lee, S., Lionetto, A. M., Longo, Francesco, Loparco, F., Lovellette, M. N., Lubrano, P., Mazziotta, M. N., Mehault, J., Michelson, P. F., Mizuno, T., Moiseev, A. A., Monte, C., Monzani, M. E., Morselli, A., Moskalenko, I. V., Murgia, S., Nakamori, T., Naumann Godo, M., Nishino, S., Nolan, P. L., Norris, J. P., Nuss, E., Ohno, M., Ohsugi, T., Okumura, A., Omodei, N., Orlando, E., Ormes, J. F., Paneque, D., Parent, D., Pelassa, V., Pesce Rollins, M., Pierbattista, M., Piron, F., Porter, T. A., Rain\`o, S., Rando, R., Reimer, A., Reimer, O., Reposeur, T., Roth, M., Sadrozinski, H. F., Sgr\`o, C., Siskind, E. J., Smith, P. D., Spandre, G., Spinelli, P., Suson, D. J., Tajima, H., Takahashi, H., Tanaka, T., Thayer, J. G., Thayer, J. B., Tibaldo, L., Tibolla, O., Torres, D. F., Tosti, G., Tramacere, A., Troja, E., Uchiyama, Y., Uehara, T., Usher, T. L., Vandenbroucke, J., Etten, A., Vasileiou, V., Vianello, G., Vilchez, N., Vitale, V., Waite, A. P., Wang, P., Winer, B. L., Wood, K. S., Yamamoto, H., Yamazaki, R., Yang, Z., Yasuda, H., Ziegler, M., Zimmer, S., Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7), Laboratoire Leprince-Ringuet (LLR), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire Univers et Particules de Montpellier (LUPM), Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Montpellier 2 - Sciences et Techniques (UM2), Institut de recherche en astrophysique et planétologie (IRAP), Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), GLAST, Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Montpellier (UM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)
Subjects: [PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Astrophysics::High Energy Astrophysical Phenomena, Cosmic ray, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, acceleration of particles, cosmic rays, gamma rays, ISM, ISM: individual objects (G8.7–0.1, HESS J1804–216), ISM: supernova remnants, Spectral line, Particle decay, individual objects: G8.7{\ndash}0.1 HESS J1804{\ndash}216 [ISM], gamma rays: ISM, ISM: individual objects (G8.7?0.1, ISM [gamma rays], ISM: individual objects (G8.7?0.1, HESS J1804?216), Astronomy and Astrophysics, Space and Planetary Science, 0103 physical sciences, 14. Life underwater, Supernova remnant, ISM: individual objects (G8.7-0.1, 010303 astronomy & astrophysics, acceleration of particle, cosmic ray, Astrophysics::Galaxy Astrophysics, Acceleration of particles, ISM: individual objects (G8.7-0.1, HESS J1804-216), Physics, Spectral index, HESS J1804-216), 010308 nuclear & particles physics, [SDU.ASTR.HE]Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], supernova remnants [ISM], Astronomy, Gamma-ray astronomy, ISM: individual objects: G8.7{\ndash}0.1 HESS J1804{\ndash}216, Interstellar medium, HESS J1804?216), High Energy Physics::Experiment, Astrophysics - High Energy Astrophysical Phenomena, Fermi Gamma-ray Space Telescope
Abstract: We present a detailed analysis of the GeV gamma-ray emission toward the supernova remnant (SNR) G8.7-0.1 with the Large Area Telescope (LAT) onboard the \emph{Fermi} Gamma-ray Space Telescope. An investigation of the relationship among G8.7-0.1 and the TeV unidentified source HESS J1804-216 provides us with an important clue on diffusion process of cosmic rays if particle acceleration operates in the SNR. The GeV gamma-ray emission is extended with most of the emission in positional coincidence with the SNR G8.7-0.1 and a lesser part located outside the western boundary of G8.7-0.1. The region of the gamma-ray emission overlaps spatially-connected molecular clouds, implying a physical connection for the gamma-ray structure. The total gamma-ray spectrum measured with LAT from 200 MeV--100 GeV can be described by a broken power-law function with a break of 2.4 $\pm$ 0.6 (stat) $\pm$ 1.2 (sys) GeV, and photon indices of 2.10 $\pm$ 0.06 (stat) $\pm$ 0.10 (sys) below the break and 2.70 $\pm$ 0.12 (stat) $\pm$ 0.14 (sys) above the break. Given the spatial association among the gamma rays, the radio emission of G8.7$-$0.1, and the molecular clouds, the decay of $\pi^{0}$s produced by particles accelerated in the SNR and hitting the molecular clouds naturally explains the GeV gamma-ray spectrum. We also find that the GeV morphology is not well represented by the TeV emission from HESS J1804$-$216 and that the spectrum in the GeV band is not consistent with the extrapolation of the TeV gamma-ray spectrum. The spectral index of the TeV emission is consistent with the particle spectral index predicted by a theory that assumes energy-dependent diffusion of particles accelerated in an SNR. We discuss the possibility that the TeV spectrum originates from the interaction of particles accelerated in G8.7$-$0.1 with molecular clouds, and we constrain the diffusion coefficient of the particles., Comment: 42 pages, 5 figures. Accepted for publication in the Astrophysical Journal. Corresponding authors: Y. Hanabata, H. Katagiri
Published: 2012
Full Text: View/download PDF

36. Risk factors for candidemia: a prospective matched case-control study

Author: Julien Poissy, Lauro Damonti, Anne Bignon, Nina Khanna, Matthias Von Kietzell, Katia Boggian, Dionysios Neofytos, Fanny Vuotto, Valérie Coiteux, Florent Artru, Stephan Zimmerli, Jean-Luc Pagani, Thierry Calandra, Boualem Sendid, Daniel Poulain, Christian van Delden, Frédéric Lamoth, Oscar Marchetti, Pierre-Yves Bochud, the FUNGINOS, and Allfun French Study Groups
Subjects: Candidemia, Risk factors, Central venous catheter, Total parenteral nutrition, Scores, Antibiotics, Medical emergencies. Critical care. Intensive care. First aid, RC86-88.9
Abstract: Abstract Background Candidemia is an opportunistic infection associated with high morbidity and mortality in patients hospitalized both inside and outside intensive care units (ICUs). Identification of patients at risk is crucial to ensure prompt antifungal therapy. We sought to assess risk factors for candidemia and death, both outside and inside ICUs. Methods This prospective multicenter matched case-control study involved six teaching hospitals in Switzerland and France. Cases were defined by positive blood cultures for Candida sp. Controls were matched to cases using the following criteria: age, hospitalization ward, hospitalization duration, and, when applicable, type of surgery. One to three controls were enrolled by case. Risk factors were analyzed by univariate and multivariate conditional regression models, as a basis for a new scoring system to predict candidemia. Results One hundred ninety-two candidemic patients and 411 matched controls were included. Forty-four percent of included patients were hospitalized in ICUs, and 56% were hospitalized outside ICUs. Independent risk factors for candidemia in the ICU population included total parenteral nutrition, acute kidney injury, heart disease, prior septic shock, and exposure to aminoglycoside antibiotics. Independent risk factors for candidemia in the non-ICU population included central venous catheter, total parenteral nutrition, and exposure to glycopeptides and nitroimidazoles. The accuracy of the scores based on these risk factors is better in the ICU than in the non-ICU population. Independent risk factors for death in candidemic patients included septic shock, acute kidney injury, and the number of antibiotics to which patients were exposed before candidemia. Discussion While this study shows a role for known and novel risk factors for candidemia, it specifically highlights important differences in their distribution according to the hospital setting (ICU versus non-ICU). Conclusion This study provides novel risk scores for candidemia accounting for the hospital setting and recent progress in patients’ management strategies and fungal epidemiology.
Published: 2020
Full Text: View/download PDF

37. DIRAC framework evaluation for theFermi-LAT and CTA experiments

Author: Matvey Sapunov, Johann Cohen-Tanugi, Stephan Zimmer, Luisa Arrabito, Frederic Piron, M. Renaud, Michael Kuss, Vincent Rolland, Ricardo Graciani Diaz, Francesco Longo, Andrei Tsaregorodtsev, Laboratoire Univers et Particules de Montpellier (LUPM), Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), D.L. Groep (ed.) , D. Bonacorsi (ed.), Arrabito, L., Cohen Tanugi, J., Diaz, R. Graciani, Longo, Francesco, Kuss, M., Piron, F., Renaud, M., Rolland, V., Sapunov, M., Tsaregorodtsev, A., Zimmer, S., and Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, History, Cherenkov Telescope Array, Large Hadron Collider, Astrophysics::High Energy Astrophysical Phenomena, Distributed computing, Dirac (software), DIRAC Framework, Cherenkov Telescope Array, Fermi Gamma Ray Telescope, Monte Carlo, GRID, Astrophysics::Instrumentation and Methods for Astrophysics, Context (language use), Astrophysics, Grid, 7. Clean energy, Computer Science Applications, Education, Workflow, DIRAC Framework, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Fermi Gamma Ray Telescope, GRID, Monte Carlo, Workflow management system, Fermi Gamma-ray Space Telescope
Abstract: International audience; DIRAC (Distributed Infrastructure with Remote Agent Control) is a general framework for the management of tasks over distributed heterogeneous computing environments. It has been originally developed to support the production activities of the LHCb (Large Hadron Collider Beauty) experiment and today is extensively used by several particle physics and biology communities. Current (Fermi Large Area Telescope – LAT) and planned (Cherenkov Telescope Array – CTA) new generation astrophysical/cosmological experiments, with very large processing and storage needs, are currently investigating the usability of DIRAC in this context. Each of these use cases has some peculiarities: Fermi-LAT will interface DIRAC to its own workflow system to allow the access to the grid resources, while CTA is using DIRAC as workflow management system for Monte Carlo production and analysis on the grid. We describe the prototype effort that we lead toward deploying a DIRAC solution for some aspects of Fermi-LAT and CTA needs. 1. Introduction The Large Area Telescope (LAT) is the primary instrument on the Fermi Gamma-ray Space Telescope mission, launched on June 11, 2008. It is the product of an international collaboration between DOE, NASA and academic US institutions as well as international partners in France, Italy, Japan and Sweden. The LAT is a pair-conversion detector of high-energy gamma rays covering the energy range from 20 MeV to more than 300 GeV [1]. It has been designed to detect gamma rays in a broad energy range, with good position resolution (
Published: 2014
Full Text: View/download PDF

38. Six groups of ground-dwelling arthropods show different diversity responses along elevational gradients in the Swiss Alps.

Author: José D Gilgado, Hans-Peter Rusterholz, Brigitte Braschler, Stephan Zimmermann, Yannick Chittaro, and Bruno Baur
Subjects: Medicine, Science
Abstract: Elevational gradients along mountain slopes offer opportunities to study key factors shaping species diversity patterns. Several environmental factors change over short distances along the elevational gradient in predictable ways. However, different taxa respond to these factors differently resulting in various proposed models for biodiversity patterns along elevational transects. Using a multi-taxa approach, we investigated the effects of elevation, area, habitat and soil characteristics on species richness, individual abundance and species composition of six groups of ground-dwelling arthropods along four transect lines in the Swiss National Park and its surroundings (Eastern Alps). Spiders, millipedes, centipedes, ants, ground beetles and rove beetles were sampled using standardized methods (pitfall traps, cardboard traps, visual search) in 65 sites spanning an elevational range from 1800 to 2750 m a.s.l.. A total of 14,782 individuals comprising 248 species were collected (86 spider, 74 rove beetle, 34 ground beetle, 21 millipede, 19 centipede and 14 ant species). Linear mixed model-analysis revealed that rarefied species richness in five out of the six arthropod groups was affected by elevation (the quadratic term of elevation provided the best fit in most cases). We found three different patterns (linear decrease in centipedes, low elevation plateau followed by a decrease in ants and rove beetles, and midpoint peak in spiders and millipedes). These patterns were only partially mirrored when considering individual abundance. Elevation influenced species composition in all groups examined. Overall, elevation was the most important factor explaining the diversity patterns, while most local habitat and soil characteristics have little influence on these patterns. Our study supports the importance of using multi-taxa approaches when examining effects of elevational gradients. Considering only a single group may result in misleading findings for overall biodiversity.
Published: 2022
Full Text: View/download PDF

39. Changes in Root–Shoot Allometric Relations in Alpine Norway Spruce Trees After Strip Cutting

Author: Petia Simeonova Nikolova, Jan Geyer, Peter Brang, Paolo Cherubini, Stephan Zimmermann, and Holger Gärtner
Subjects: strip cutting, mountain forests, Norway spruce, edge trees, biomass allocation, root-shoot allometric responses, Plant culture, SB1-1110
Abstract: Silvicultural interventions such as strip cuttings can change the resource availability of the edge trees. This may alter tree allometry, as light regime, water, and nutrient availability can change at the forest edge. Increased root growth may optimize resource uptake and/or enhance tree anchorage to withstand the altered wind regime. However, little is known about the patterns of the root–shoot allometric responses to strip cuttings. In three alpine stands differing in climate, site productivity, and stand characteristics, we selected 71 Norway spruce trees and took increment cores from stems, root collars, and main roots. This enabled us to study changes in the long-term root-stem allometry for 46 years and short-term allometric responses to intervention. The effects of cutting were compared between edge trees and trees from the stand interior in 10 years before and after the intervention. The long-term allocation to roots increased with stem diameter, with the strongest effects on the regularly managed stand with the tallest and largest trees. These results support the allometric biomass partitioning theory, which postulates resource allocation patterns between different plant organs to depend on plant size. Strip cutting on north-facing slopes boosted edge-tree growth in all plant compartments and enhanced allocation to roots. This change in allometry started 2 years after cutting but disappeared 7–8 years later. In the post-cutting period, the highest root–shoot increase was observed in the small trees independent of the site. This indicates the change in growing conditions to have the strongest effects in formerly suppressed trees. Thus, the effect of such acclimation on the wind firmness of subdominant spruce trees is a question with high importance for optimizing cutting layouts in lowering post-cutting vulnerability to disturbance. The results from this case study contribute to a better understanding of the structural acclimation of spruce trees from high-elevation forests to new forest edges. However, for a more mechanistic understanding of environmental drivers, further analyses of tree-ring stable isotopes are recommended.
Published: 2021
Full Text: View/download PDF

40. A Critical Evaluation of the Relationship Between the Effective Cation Exchange Capacity and Soil Organic Carbon Content in Swiss Forest Soils

Author: Emily F. Solly, Valentino Weber, Stephan Zimmermann, Lorenz Walthert, Frank Hagedorn, and Michael W. I. Schmidt
Subjects: effective cation exchange capacity, soil organic carbon content, forests, subsoil, carbon stabilization, Forestry, SD1-669.5, Environmental sciences, GE1-350
Abstract: An improved identification of the environmental variables that can be used to predict the content of soil organic carbon (SOC) stored belowground is required to reduce uncertainties in estimating the response of the largest terrestrial carbon reservoir to environmental change. Recent studies indicate that some metal cations can have an active role in the stabilization of SOC, primarily by coordinating the interaction between soil minerals and organic matter through cation bridging and by creating complexes with organic molecules when their hydration shells are displaced. The effective cation exchange capacity (CEC eff.) is a measure that integrates information about available soil surfaces to which metal cations are retained. Therefore, we critically tested the relationship between CEC eff. and SOC content using regression analyses for more than 1000 forest sites across Switzerland, spanning a unique gradient of mean annual precipitation (640–2500 mm), elevation (277–2207 m a.s.l), pH (2.8–8.1) and covering different geologies and vegetation types. Within these sites, SOC content is significantly related to CEC eff., in both topsoils and subsoils. Our results demonstrate that, on a pH-class average, in Swiss forest topsoils ( 5.5, between 59 and 83% of subsoil CEC eff. originates from exchangeable calcium, whereas in acidic soils exchangeable aluminum contributes between 21 and 44% of the CEC eff. Exchangeable iron contributes to less than 1% of the variability in CEC eff. Overall this study indicates that in Swiss forests subsoils, CEC eff. strongly reflects the surface of soil minerals to which SOC can be bound by metal cations. The strength of the relationship between CEC eff. and SOC content depends on the pH of the soil, with the highest amount of variation of SOC content explained by CEC eff. in subsoils with pH > 5.5.
Published: 2020
Full Text: View/download PDF

41. Characteristics of Soil Structure and Greenhouse Gas Fluxes on Ten-Year Old Skid Trails with and without Black Alders (Alnus glutinosa (L.) Gaertn.)

Author: Hannes Warlo, Stephan Zimmermann, Friederike Lang, and Helmer Schack-Kirchner
Subjects: soil compaction, soil structure, skid trails, greenhouse gas fluxes, black alder, soil recovery, Physical geography, GB3-5030, Chemistry, QD1-999
Abstract: Forest soil compaction caused by heavy machines can cause ecosystem degradation, reduced site productivity and increased greenhouse gas (GHG) emissions. Recent studies investigating the plant-mediated alleviation of soil compaction with black alder showed promising results (Alnus glutinosa). This study aimed to measure soil recovery and GHG fluxes on machine tracks with and without black alders in North-East Switzerland. In 2008, two machine tracks were created under controlled conditions in a European beech (Fagus sylvatica) stand with a sandy loam texture. Directly after compaction, soil physical parameters were measured on one track while the other track was planted with alders. Initial topsoil bulk density and porosity on the track without alders were 1.52 g cm−3 and 43%, respectively. Ten years later, a decrease in bulk density to 1.23 g cm−3 and an increase in porosity to 57% indicated partial structure recovery. Compared with the untreated machine track, alder had no beneficial impact on soil physical parameters. Elevated cumulative N2O emission (+30%) under alder compared with the untreated track could result from symbiotic nitrogen fixation by alder. Overall, CH4 fluxes were sensitive to the effects of soil trafficking. We conclude that black alder did not promote the recovery of a compacted sandy loam while it had the potential to deteriorate the GHG balance of the investigated forest stand.
Published: 2022
Full Text: View/download PDF

42. Leaf Morphological Traits and Leaf Nutrient Concentrations of European Beech Across a Water Availability Gradient in Switzerland

Author: Maryam Salehi, Lorenz Walthert, Stephan Zimmermann, Peter Waldner, Maria Schmitt, Patrick Schleppi, Käthi Liechti, Mohsen Ahmadi, Ghavamuddin Zahedi Amiri, Ivano Brunner, and Anne Thimonier
Subjects: beech forest, drought stress, gradient analysis, leaf functional trait, tree nutrition, Forestry, SD1-669.5, Environmental sciences, GE1-350
Abstract: Climate change and the expected increase in frequency of dry summers are likely to affect the growth of important tree species. We investigated relationships between morphological and chemical leaf traits of European beech (Fagus sylvatica L.) and environmental factors along a water availability gradient consisting of 12 sites located throughout Switzerland. We found that leaf dry mass and leaf area tended to decrease with increasing long-term mean annual precipitation (MAP) and actual to potential transpiration (AT/PT), two correlated variables that form the water availability gradient. These results contrast with those of several other studies, and might be explained by favorable temperature and humidity conditions during leaf formation in spring at the dry sites. Although the relationship was not linear over the whole gradient, the drier sites were characterized by beech with a lower specific leaf area, along with higher foliar potassium (K) and lower foliar nitrogen (N) concentrations. These patterns likely reflect strategies developed as an adaptation to reduced water availability, but they also result from variation in the availability of nutrients in soil across our sites. In the case of N, there are indications that atmospheric deposition plays a role in foliar concentrations.
Published: 2020
Full Text: View/download PDF

43. Ecology of Alpine Macrofungi - Combining Historical with Recent Data

Author: Ivano Brunner, Beat Frey, Martin Hartmann, Stephan Zimmermann, Frank Graf, Laura M. Suz, Tuula Niskanen, Martin I. Bidartondo, and Beatrice Senn-Irlet
Subjects: Dryas octopetala, fungal communities, ectomycorrhiza, Salix herbacea, Salix reticulata, Salix retusa, Microbiology, QR1-502
Abstract: Historical datasets of living communities are important because they can be used to document creeping shifts in species compositions. Such a historical data set exists for alpine fungi. From 1941 to 1953, the Swiss geologist Jules Favre visited yearly the region of the Swiss National Park and recorded the occurring fruiting bodies of fungi >1 mm (so-called “macrofungi”) in the alpine zone. Favre can be regarded as one of the pioneers of alpine fungal ecology not least because he noted location, elevation, geology, and associated plants during his numerous excursions. However, some relevant information is only available in his unpublished field-book. Overall, Favre listed 204 fungal species in 26 sampling sites, with 46 species being previously unknown. The analysis of his data revealed that the macrofungi recorded belong to two major ecological groups, either they are symbiotrophs and live in ectomycorrhizal associations with alpine plant hosts, or they are saprotrophs and decompose plant litter and soil organic matter. The most frequent fungi were members of Inocybe and Cortinarius, which form ectomycorrhizas with Dryas octopetala or the dwarf alpine Salix species. The scope of the present study was to combine Favre's historical dataset with more recent data, either with the “SwissFungi” database or with data from major studies of the French and German Alps, and with the data from novel high-throughput DNA sequencing techniques of soils from the Swiss Alps. Results of the latter application revealed, that problems associated with these new techniques are manifold and species determination remains often unclear. At this point, the fungal taxa collected by Favre and deposited as exsiccata at the “Conservatoire et Jardin Botaniques de la Ville de Genève” could be used as a reference sequence dataset for alpine fungal studies. In conclusion, it can be postulated that new improved databases are urgently necessary for the near future, particularly, with regard to investigating fungal communities from alpine regions using new techniques.
Published: 2017
Full Text: View/download PDF

44. Is Society Built on Collective Intentions? A Response to Searle

Author: Stephan Zimmermann
Subjects: social ontology, collective intentionality, Searle, Fine Arts, Aesthetics, BH1-301
Abstract: The following considerations belong to what has recently been discussed as “social ontology”. The paper deals with Searle’s understanding of the difference between social and natural reality. The thesis is that this differentiation falls short because it supports a wrong ontological hierarchy. Social ontology is mistakenly, as I want to show, designed by Searle as a domain-specific ontology subjected to the ontology of nature. I will cast doubt on the persuasive power of this idea by dealing with Searle’s notion of collective intentionality, which lies at the very heart of his doctrine of social and institutional facts: social reality shall originate from collective intentionality. But this notion stands for a wrong objectification of the social, for it is highly questionable whether the social is really exhausted by being the content of our action plans and truth-apt thoughts.
Published: 2014
Full Text: View/download PDF

45. Conceptualizing Shadow IT Integration Drawbacks from a Systemic Viewpoint

Author: Melanie Huber, Stephan Zimmermann, Christopher Rentrop, and Carsten Felden
Subjects: shadow IT, IT integration, IT integration drawbacks, application integration, path dependency, path biography, switching costs, Systems engineering, TA168, Technology (General), T1-995
Abstract: Business units are increasingly able to fuel the transformation that digitalization demands of organizations. Thereby, they can implement Shadow IT (SIT) without involving a central IT department to create flexible and innovative solutions. Self-reinforcing effects lead to an intertwinement of SIT with the organization. As a result, high complexities, redundancies, and sometimes even lock-ins occur. IT Integration suggests itself to meet these challenges. However, it can also eliminate the benefits that SIT presents. To help organizations in this area of conflict, we are conducting a literature review including a systematic search and an analysis from a systemic viewpoint using path dependency and switching costs. Our resulting conceptual framework for SIT integration drawbacks classifies the drawbacks into three dimensions. The first dimension consists of switching costs that account for the financial, procedural, and emotional drawbacks and the drawbacks from a loss of SIT benefits. The second dimension includes organizational, technical, and level-spanning criteria. The third dimension classifies the drawbacks into the global level, the local level, and the interaction between them. We contribute to the scientific discussion by introducing a systemic viewpoint to the research on shadow IT. Practitioners can use the presented criteria to collect evidence to reach an IT integration decision.
Published: 2018
Full Text: View/download PDF

46. Common invasive fungal diseases: an overview of invasive candidiasis, aspergillosis, cryptococcosis, and Pneumocystis pneumonia

Author: Yvonne Schmiedel and Stephan Zimmerli
Subjects: aspergillosis, cryptococcosis, pneumocystis pneumonia, Medicine
Published: 2016
Full Text: View/download PDF

47. DmpIRFs and DmpST: DAMPE instrument response functions and science tools for gamma-ray data analysis.

Author: Kai-Kai Duan, Wei Jiang, Yun-Feng Liang, Zhao-Qiang Shen, Zun-Lei Xu, Yi-Zhong Fan, Fabio Gargano, Simone Garrappa, Dong-Ya Guo, Shi-Jun Lei, Xiang Li, Mario Nicola Mazziotta, Maria Fernanda Munoz Salinas, Meng Su, Valerio Vagelli, Qiang Yuan, Chuan Yue, and Stephan Zimmer
Published: 2019
Full Text: View/download PDF

48. All-sky Medium Energy Gamma-ray Observatory: Exploring the Extreme Multimessenger Universe

Author: Julie McEnery, Alexander van der Horst, Alberto Dominguez, Alexander Moiseev, Alexandre Marcowith, Alice Harding, Amy Lien, Andrea Giuliani, Andrew Inglis, Stefano Ansoldi, Antonio Stamerra, Antonios Manousakis, Andy Strong, Cosimo Bambi, Barbara Patricelli, Matthew Baring, Juan Abel Barrio, Denis Bastieri, Brian Fields, John Beacom, Volker Beckmann, Wlodek Bednarek, Bindu Rani, Steven Boggs, Aleksey Bolotnikov, Brad Cenko, S., Jim Buckley, Brian Grefenstette, Michelle Hui, Carlotta Pittori, Chanda Prescod-Weinstein, Chris Shrader, Christian Gouiffes, Carolyn Kierans, Colleen Wilson-Hodge, Ammando, Filippo D., Daniel Castro, Daniel Kocveski, Dario Gasparrini, David Thompson, David Williams, Alessandro De Angelis, Denis Bernard, Seth Digel, Daniel Morcuende, Eric Charles, Elisabetta Bissaldi, Elizabeth Hays, Elizabeth Ferrara, Enrico Bozzo, Eric Grove, Eric Wulf, Eugenio Bottacini, Ezio Caroli, Fabian Kislat, Foteini Oikonomou, Francesco Giordano, Francesco Longo, Chris Fryer, Yasushi Fukazawa, Markos Georganopoulos, Georgia De Nolfo, Giacomo Vianello, Gottfried Kanbach, George Younes, Harsha Blumer, Dieter Hartmann, Margarita Hernanz, Hiromitsu Takahashi, Hui Li, Ivan Agudo, Igor Moskalenko, Inga Stumke, Isabelle Grenier, Jacob Smith, James Rodi, Jeremy Perkins, Joseph Gelfand, Jamie Holder, Jurgen Knodlseder, Joachim Kopp, Jean-Philippe Lenain, José-Manuel Álvarez, Jessica Metcalfe, John Krizmanic, Stephen, John B., Jack Hewitt, John Mitchell, Pat Harding, John Tomsick, Judith Racusin, Justin Finke, Oleg Kargaltsev, Klimenko, Alexei V., Henric Krawczynski, Karl Smith, Hidetoshi Kubo, Leonardo Di Venere, Lea Marcotulli, Jan Lommler, Lucas Parker, Luca Baldini, Luca Foffano, Luca Zampieri, Luigi Tibaldo, Maria Petropoulou, Marco Ajello, Manuel Meyer, Marcos López, Marc McConnell, Markus Boettcher, Martina Cardillo, Manel Martinez, Matthew Kerr, Nicola Mazziotta, M., Mattia Di Mauro, Matthew Wood, Eileen Meyer, Michael Briggs, Michaël De Becker, Michael Lovellette, Michele Doro, Sanchez-Conde, Miguel A., Michael Moss, Tsunefumi Mizuno, Marc Ribó, Kazuhiro Nakazawa, Naoko Kurahashi Neilson, Natalia Auricchio, Nicola Omodei, Uwe Oberlack, Masanori Ohno, Elena Orlando, Nepomuk Otte, Paolo Coppi, Peter Bloser, Haocheng Zhang, Philippe Laurent, Martin Pohl, Elisa Prandini, Peter Shawhan, Regina Caputo, Riccardo Campana, Riccardo Rando, Richard Woolf, Robert Johnson, Roberto Mignani, Roland Walter, Roopesh Ojha, Rui Curado da Silva, Stefano Dietrich, Stefan Funk, Silvia Zane, Sonia Anton, Sara Buson, Sara Cutini, Pablo Saz Parkinson, Richard Schirato, Sean Griffin, Kaufmann, S., Lukasz Stawarz, Stefano Ciprini, Stefano Del Sordo, Sam Jones, Sylvain Guiriec, Hiro Tajima, Teddy Cheung, Lih-Sin The, Tonia Venters, Troy Porter, Tim Linden, Ulisses Barres, Paliya, Vaidehi S., Vladimir Bozhilov, Tom Vestrand, Vincent Tatischeff, Wenlei Chen, Xilu Wang, Yasuyuki Tanaka, Lucas Uhm, Bing Zhang, Stephan Zimmer, Andreas Zoglauer, Zorawar Wadiasingh, NASA Goddard Space Flight Center (GSFC), Universidad Complutense de Madrid = Complutense University of Madrid [Madrid] (UCM), Clemson University, Centros de Laseres Pulsados, Universidade de Aveiro, Istituto Nazionale di Fisica Nucleare [Pisa] (INFN), Istituto Nazionale di Fisica Nucleare (INFN), Fudan University [Shanghai], Rice University [Houston], Centro Brasileiro de Pesquisas Físicas (CBPF), Ministério da Ciência e Tecnologia, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Istituto Nazionale di Fisica Nucleare, sezione di Bari (INFN, sezione di Bari), Los Alamos National Laboratory (LANL), West Virginia University [Morgantown], North-West University [South Aftrica] (NWU), University of California [San Diego] (UC San Diego), University of California (UC), Brookhaven National Laboratory [Upton, NY] (BNL), UT-Battelle, LLC-Stony Brook University [SUNY] (SBU), State University of New York (SUNY)-State University of New York (SUNY)-U.S. Department of Energy [Washington] (DOE), Софийски университет = Sofia University, Université de Genève = University of Geneva (UNIGE), University of Alabama in Huntsville (UAH), Washington University in Saint Louis (WUSTL), Harvard-Smithsonian Center for Astrophysics (CfA), Harvard University-Smithsonian Institution, SLAC National Accelerator Laboratory (SLAC), Stanford University, Naval Research Laboratory (NRL), Agenzia Spaziale Italiana (ASI), Yale University [New Haven], Universidade de Coimbra [Coimbra], ASI Science Data Center (ASDC), Italian Space Agency, Istituto Nazionale di Fisica Nucleare, Sezione di Perugia (INFN, Sezione di Perugia), Istituto di Radioastronomia [Bologna] (IRA), Istituto Nazionale di Astrofisica (INAF), Université de Liège, CNR Institute of Atmospheric Sciences and Climate (ISAC), National Research Council of Italy | Consiglio Nazionale delle Ricerche (CNR), University of Illinois System, Hiroshima University, Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), New York University [New York] (NYU), NYU System (NYU), University of Maryland [Baltimore County] (UMBC), University of Maryland System, Commissariat à l'énergie atomique et aux énergies alternatives (CEA), California Institute of Technology (CALTECH), Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), The George Washington University (GW), University of North Florida [Jacksonville] (UNF), University of Delaware [Newark], NASA Marshall Space Flight Center (MSFC), University of California [Santa Cruz] (UC Santa Cruz), Max Planck Institute for Extraterrestrial Physics (MPE), Max-Planck-Gesellschaft, Universidad Autónoma de Chiapas, University of New Hampshire (UNH), Institut de recherche en astrophysique et planétologie (IRAP), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Kyoto University, Drexel University, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Stockholm University, Università degli studi di Trieste = University of Trieste, Istituto Nazionale di Fisica Nucleare, Sezione di Trieste (INFN, Sezione di Trieste), Copernicus Astronomical Center of the Polish Academy of Sciences (CAMK), Polish Academy of Sciences (PAN), Laboratoire Univers et Particules de Montpellier (LUPM), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut de Física d’Altes Energies [Barcelone] (IFAE), Universitat Autònoma de Barcelona (UAB), Argonne National Laboratory [Lemont] (ANL), Nagoya University, European Southern Observatory (ESO), US Naval Observatory (US NAVAL OBSERVATORY), US Naval Observatory, Deutsches Elektronen-Synchrotron [Hamburg] (DESY), Princeton University, Universitat de Barcelona, Universitat de Barcelona (UB), Istituto di Astrofisica e Planetologia Spaziali - INAF (IAPS), University of Maryland [College Park], Uniwersytet Jagielloński w Krakowie = Jagiellonian University (UJ), Max-Planck-Institut für Extraterrestrische Physik (MPE), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), University of California [Berkeley] (UC Berkeley), University College of London [London] (UCL), University of Nevada [Las Vegas] (WGU Nevada), Purdue University [West Lafayette], Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), University of California, U.S. Department of Energy [Washington] (DOE)-UT-Battelle, LLC-Stony Brook University [SUNY] (SBU), State University of New York (SUNY)-State University of New York (SUNY), University of Sofia, Université de Genève (UNIGE), Smithsonian Institution-Harvard University [Cambridge], Consiglio Nazionale delle Ricerche (CNR), Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7), University of California [Santa Cruz] (UCSC), Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Kyoto University [Kyoto], Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), University of Trieste, Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), University of California [Berkeley], Complutense University of Madrid (UCM), National Institute for Nuclear Physics (INFN), Brookhaven National Laboratory [Upton] (BNL), Stony Brook University [SUNY] (SBU), Harvard University [Cambridge]-Smithsonian Institution, Stanford Linear Accelerator Center (SLAC), Stanford University [Stanford], Istituto di Radioastronomia (IRA), Friedrich-Alexander Universitaet Erlangen-Nuernberg, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM PS1), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Univ. Paris-Sud, Commissariat à l'Énergie Atomique et aux Énergies Alternatives (CEA) - Grenoble, George Washington University (GW), University of North Florida, Laboratoire d'Astrophysique de l'Observatoire Midi-Pyrénées (LATT), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Université de Montpellier (UM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Universitat Autònoma de Barcelona [Barcelona] (UAB), and Jagiellonian University [Krakow] (UJ)
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE), [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], [PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, Instrumentation and Methods for Astrophysics (astro-ph.IM)
Abstract: The All-sky Medium Energy Gamma-ray Observatory (AMEGO) is a probe class mission concept that will provide essential contributions to multimessenger astrophysics in the late 2020s and beyond. AMEGO combines high sensitivity in the 200 keV to 10 GeV energy range with a wide field of view, good spectral resolution, and polarization sensitivity. Therefore, AMEGO is key in the study of multimessenger astrophysical objects that have unique signatures in the gamma-ray regime, such as neutron star mergers, supernovae, and flaring active galactic nuclei. The order-of-magnitude improvement compared to previous MeV missions also enables discoveries of a wide range of phenomena whose energy output peaks in the relatively unexplored medium-energy gamma-ray band., Comment: Astro2020 APC White Paper Updated to make small change to author list in metadata

49. A Combined Analysis of Clusters of Galaxies - Gamma Ray Emission from Cosmic Rays and Dark Matter

Author: Stephan Zimmer, Conrad, Jan, and Pinzke, Anders
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE), High Energy Physics - Phenomenology, Cosmology and Nongalactic Astrophysics (astro-ph.CO), High Energy Physics - Phenomenology (hep-ph), Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: Multiwavelength observations suggest that clusters are reservoirs of vast amounts relativistic electrons and positrons that are either injected into and accelerated directly in the intra-cluster medium, or produced as secondary pairs by cosmic ray ions scattering on ambient protons. In these possible scenarios gamma rays are produced either through electrons upscattering low-energy photons or by decay of neutral pions produced by hadronic interactions. In addition, the high mass-to-light ratios in clusters in combination with considerable Dark Matter (DM) overdensities makes them interesting targets for indirect DM searches with gamma rays. The resulting signals are different from known point sources or from diffuse emission and could possibly be detected with the Fermi-LAT. Both WIMP annihilation/decay spectra and cosmic ray induced emission are determined by universal parameters, which make a combined statistical likelihood analysis feasible. We present initial results of this analysis leading to limits on the DM annihilation cross section or decay time and on the hadron injection efficiency., Comment: 5 pages, 4 figures. Contribution to the 2011 Fermi Symposium - eConf Proceedings C110509

50. Diagnosis and treatment of mucormycosis in patients with hematological malignancies: guidelines from the 3rd European Conference on Infections in Leukemia (ECIL 3)

Author: Anna Skiada, Fanny Lanternier, Andreas H. Groll, Livio Pagano, Stephan Zimmerli, Raoul Herbrecht, Olivier Lortholary, and George L. Petrikkos
Subjects: Diseases of the blood and blood-forming organs, RC633-647.5
Abstract: Mucormycosis is an emerging cause of infectious morbidity and mortality in patients with hematologic malignancies. However, there are no recommendations to guide diagnosis and management. The European Conference on Infections in Leukemia assigned experts in hematology and infectious diseases to develop evidence-based recommendations for the diagnosis and treatment of mucormycosis. The guidelines were developed using the evidence criteria set forth by the American Infectious Diseases Society and the key recommendations are summarized here. In the absence of validated biomarkers, the diagnosis of mucormycosis relies on histology and/or detection of the organism by culture from involved sites with identification of the isolate at the species level (no grading). Antifungal chemotherapy, control of the underlying predisposing condition, and surgery are the cornerstones of management (level A II). Options for first-line chemotherapy of mucormycosis include liposomal amphotericin B and amphotericin B lipid complex (level B II). Posaconazole and combination therapy of liposomal amphotericin B or amphotericin B lipid complex with caspofungin are the options for second line-treatment (level B II). Surgery is recommended for rhinocerebral and skin and soft tissue disease (level A II). Reversal of underlying risk factors (diabetes control, reversal of neutropenia, discontinuation/taper of glucocorticosteroids, reduction of immunosuppressants, discontinuation of deferroxamine) is important in the treatment of mucormycosis (level A II). The duration of antifungal chemotherapy is not defined but guided by the resolution of all associated symptoms and findings (no grading). Maintenance therapy/secondary prophylaxis must be considered in persistently immunocompromised patients (no grading).
Published: 2013
Full Text: View/download PDF

Catalog

Books, media, physical & digital resources

See catalog results

Searchworks

Select search scope, currently: Articles Catalog books, media & more in Jio Institute collections Articles journal articles & other e-resources

Search

Search Constraints

Refine your results

Search Limiters

Topic

Publication Year Range

Language

Publication Type

Journal

Database

Publisher

54 results on '"Stephan Zimmer"'

Search Results

Catalog

Select search scope, currently: Articles

Catalog

books, media & more in Jio Institute collections

Articles

journal articles & other e-resources