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159 results on '"Andrii Neronov"'

151. Superorbital modulation of X-ray emission from gamma-ray binary LSI +61 303

Author

Guy G. Pooley, Andrii Neronov, Alexander A. Lutovinov, Denys Malyshev, S. Molkov, and Maria Chernyakova

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Astrophysics::High Energy Astrophysical Phenomena, Gamma ray, Phase (waves), FOS: Physical sciences, Binary number, Astronomy and Astrophysics, Astrophysics, Plasma, Approx, Astrophysics - Astrophysics of Galaxies, law.invention, Time of flight, Space and Planetary Science, law, Astrophysics of Galaxies (astro-ph.GA), Binary star, Binary system, Astrophysics - High Energy Astrophysical Phenomena, Flare
Abstract

We report the discovery of a systematic constant time lag between the X-ray and radio flares of the gamma-ray binary LSI +61 303, persistent over a long, multi-year timescale. Using the data from the monitoring of the system by RXTE we show that the orbital phase of X-ray flares from the source varies from {phi}{sub X} {approx_equal} 0.35 to {phi}{sub X} {approx_equal} 0.75 on the superorbital 4.6 yr timescale. Simultaneous radio observations show that periodic radio flares always lag the X-ray flare by {Delta}{phi}{sub X-R} {approx_equal} 0.2. We propose that the constant phase lag corresponds to the time of flight of the high-energy particle-filled plasma blobs from inside the binary to the radio emission region at the distance of {approx}10 times the binary separation distance. We put forward a hypothesis that the X-ray bursts correspond to the moments of formation of plasma blobs inside the binary system.

152. FACT - Status and experience from three years operation of the first SiPM camera

Author

Simona Toscano, Aleksander Paravac, Karl Mannheim, Max Nöthe, Felicitas Pauss, Matteo Balbo, Thomas Bretz, Dominik Neise, Julia Thaele, Matthias Bergmann, A.-K. Overkemping, Max Ludwig Ahnen, J. Freiwald, Wolfgang Rhode, Sabrina Einecke, Aylin Wilbert, Daniela Dorner, G. Hughes, Patrick Vogler, Dorothee Hildebrand, Christina Hempfling, Werner Lustermann, Kai Brügge, K. Meier, Andrii Neronov, Sebastian Müller, Adrian Biland, Roland Walter, Jens Buss, and Fabian Temme

Subjects
Silicon photomultiplier, Computer science, Electronic engineering
Abstract

The 34th International Cosmic Ray Conference : ICRC2015 : 30 July- 6 August, 2015, The Hague, The Netherlands / IUPAP The 34th International Cosmic Ray Conference, ICRC2015, The Hague, Netherlands, 30 Jul 2015 - 6 Aug 2015; Trieste, Italy : Sissa Medialab srl, Proceedings of science 236, 1032 pp. (2016). doi:10.22323/1.236.1032, Published by Sissa Medialab srl, Trieste, Italy

153. FACT - Influence of SiPM Crosstalk on the Performance of an Operating Cherenkov Telescope

Author

Katharina Morik, Andrii Neronov, Adrian Biland, Dorothee Hildebrand, Sabrina Einecke, Felicitas Pauss, Maximilian Noethe, Julia Thaele, Jens Buss, Simona Toscano, Roland Walter, Thomas Bretz, Kai Brügge, K. Meier, Daniela Dorner, Aleksander Paravac, Fabian Temme, Wolfgang Rhode, G. Hughes, Werner Lustermann, Dominik Neise, Patrick Vogler, Sebastian Achim Mueller, Christina Hempfling, Aylin Wilbert, Max Ludwig Ahnen, Matteo Balbo, A.-K. Overkemping, J. Freiwald, Christian Bockermann, and Karl Mannheim

Subjects
Crosstalk, Physics, Telescope, Silicon photomultiplier, Optics, business.industry, law, Optoelectronics, business, Cherenkov radiation, law.invention
Abstract

The 34th International Cosmic Ray Conference : ICRC2015 : 30 July- 6 August, 2015, The Hague, The Netherlands / IUPAP The 34th International Cosmic Ray Conference, ICRC2015, The Hague, Netherlands, 30 Jul 2015 - 6 Aug 2015; Trieste, Italy : Sissa Medialab srl, Proceedings of science 236, 863 pp. (2016). doi:10.22323/1.236.0863, Published by Sissa Medialab srl, Trieste, Italy

154. FACT - TeV flare alerts triggering multi-wavelength observations

Author

A.-K. Overkemping, Simona Toscano, Adrian Biland, Werner Lustermann, Dominik Neise, Fabian Temme, Kai Brügge, K. Meier, Aylin Wilbert, Dorothee Hildebrand, Andrii Neronov, Daniela Dorner, Matteo Balbo, Felicitas Pauss, Maximilian Noethe, Sabrina Einecke, Jens Buss, Sebastian Achim Mueller, Karl Mannheim, G. Hughes, Aleksander Paravac, Julia Thaele, Max Ludwig Ahnen, J. Freiwald, Roland Walter, Matthias Bergmann, Thomas Bretz, Wolfgang Rhode, Patrick Vogler, and Christina Hempfling

Subjects
Physics, law, Gamma ray detectors, Astronomy, Multi wavelength, Flare, law.invention
Abstract

The 34th International Cosmic Ray Conference : ICRC2015 : 30 July- 6 August, 2015, The Hague, The Netherlands / IUPAP The 34th International Cosmic Ray Conference, ICRC2015, The Hague, Netherlands, 30 Jul 2015 - 6 Aug 2015; Trieste, Italy : Sissa Medialab srl, Proceedings of science 236, 704 pp. (2016). doi:10.22323/1.236.0704, Published by Sissa Medialab srl, Trieste, Italy

155. Search for decaying eV-mass axion-like particles using gamma-ray signal from blazars

Author

Dmitri Semikoz, A. Korochkin, Andrii Neronov, AstroParticule et Cosmologie (APC (UMR_7164)), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-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), APC - THEORIE, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-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)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-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)-Institut für theoretische Physik, Universität Hamburg (UHH)-Universität Hamburg (UHH), Semikoz, Dmitri, 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)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-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)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Institut für theoretische Physik, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut für theoretische Physik

Subjects
[PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Astrophysics::High Energy Astrophysical Phenomena, Dark matter, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, law.invention, Telescope, High Energy Physics - Phenomenology (hep-ph), law, 0103 physical sciences, Blazar, Cherenkov radiation, Astrophysics::Galaxy Astrophysics, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, 010308 nuclear & particles physics, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy and Astrophysics, Cherenkov Telescope Array, Galaxy, High Energy Physics - Phenomenology, Extragalactic background light, 13. Climate action, Astrophysics - High Energy Astrophysical Phenomena, [PHYS.ASTR.HE] Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], Fermi Gamma-ray Space Telescope
Abstract

Decaying axion-like particles (ALP) with masses in the eV range which might occupy dark matter halos of the Milky Way and other galaxies produce a characteristic "bump" feature in the spectrum of extragalactic background light (EBL). This feature leaves an imprint on the gamma-ray spectra of distant extragalactic sources. We derive constraints on the ALP coupling to photons based on analysis of spectra of very-high-energy gamma-ray loud blazars. We combine gamma-ray spectral measurements by Fermi/LAT and Cherenkov telescopes and fit a model in which the intrinsic source spectrum is modified by pair production on photons produced by ALP decays. We constrain the amplitude of gamma-ray flux suppression by this effect. We find that the combined Fermi/LAT and VERITAS data set for the source 1ES 1218+304 currently provides the tightest constraint on ALP-two-photon coupling which is complementary to the constraints imposed by non-observation of excess energy loss in Horizontal Branch stars, by the high-resolution spectroscopic observations of galaxy clusters with optical telescopes and by the searches of ALP signal with CERN Solar Axion Telescope. Our analysis favours existence of a bump in the EBL spectrum which could be produced by ALPs in the mass range 2-3 eV and axion-photon coupling $\sim 10^{-10}$ GeV$^{-1}$. We discuss possibilities for verification of this hint with deeper Cherenkov telescope observations of large number of blazars with current generation instruments and with the Cherenkov Telescope Array.

156. FACT - Highlights from more than Five Years of Unbiased Monitoring at TeV Energies

Author

Fabian Temme, D. Neise, Anton Dmytriiev, Max Mahlke, L. Kortmann, Daniela Dorner, Vitalii Sliusar, Julia Thaele, R. Walter, A. S. Mueller, L. M. Ahnen, Thomas Bretz, Andrii Neronov, A. Paravac, J. Buss, Dominik Baack, Sabrina Einecke, Dominik Elsaesser, Lena Linhoff, Wolfgang Rhode, Bernd Schleicher, Christina Hempfling, M. Bulinski, Michael Blank, Felicitas Pauss, J. Oberkirch, M. Balbo, A. Shukla, Adrian Biland, D. Hildebrand, Tina Herbst, M. Noethe, K. Bruegge, F. Schulz, Karl Mannheim, and J. Adam

Subjects
Telescope, Silicon photomultiplier, Duty cycle, law, Solid-state, Astronomy, MAGIC (telescope), Latency (engineering), AKA, Cherenkov radiation, law.invention
Abstract

The First G-APD Cherenkov Telescope (FACT) is monitoring blazars at TeV energies. Thanks to the observing strategy, the automatic operation and the usage of solid state photosensors (SiPM, aka G-APDs), the duty cycle of the instrument has been maximized and the observational gaps minimized. This provides a unprecedented, unbiased data sample of almost 9000~hours of data of which 2375 hours were taken in 2016. An automatic quick look analysis provides results with low latency on a public website. More than 40 alerts have been sent in the last three years based on this. To study the origin of the very high energy emission from blazars simultaneous multi-wavelength and multi-messenger observations are crucial to draw conclusions on the underlying emission mechanisms, e.g. to distinguish between leptonic and hadronic models. FACT not only participates in multi-wavelength studies, correlation studies with other instruments and multi-messenger studies, but also collects time-resolved spectral energy distributions using a target-of-opportunity program with X-ray satellites. At TeV energies, FACT provides an unprecedented, unbiased data sample. Using up to 1850 hours per source, the duty cycle of the sources and the characteristics of flares at TeV energies are studied. In the presentation, the highlights from more than five years of monitoring will be summarized including several flaring activities of Mrk 421, Mrk 501 and 1ES 1959+650., PoS: Proceedings of Science, 301, ISSN:1824-8039

157. Data compression for the First G-APD Cherenkov Telescope

Author

Roland Walter, Julia Thaele, Adrian Biland, Felicitas Pauss, T. Steinbring, Etienne Lyard, Sabrina Einecke, G. Hughes, Matteo Balbo, Werner Lustermann, Daniela Dorner, K. Meier, Max Ludwig Ahnen, Dorothee Hildebrand, A.-K. Overkemping, Aleksander Paravac, Aylin Wilbert, Sebastian Achim Mueller, Patrick Vogler, Matthias Bergmann, Karl Mannheim, Simona Toscano, Dominik Neise, J. Freiwald, Andrii Neronov, Fabian Temme, Christina Hempfling, Thomas Bretz, and Wolfgang Rhode

Subjects
Lossless compression, Photomultiplier, Computer science, FOS: Physical sciences, Astronomy and Astrophysics, IACT, Computer Science Applications, law.invention, Telescope, Space and Planetary Science, law, Astrophysics - Instrumentation and Methods for Astrophysics, Throughput (business), Instrumentation and Methods for Astrophysics (astro-ph.IM), Cherenkov radiation, Volume (compression), Remote sensing, Data compression
Abstract

The First Geiger-mode Avalanche photodiode (G-APD) Cherenkov Telescope (FACT) has been operating on the Canary island of La Palma since October 2011. Operations were automated so that the system can be operated remotely. Manual interaction is required only when the observation schedule is modified due to weather conditions or in case of unexpected events such as a mechanical failure. Automatic operations enabled high data taking efficiency, which resulted in up to two terabytes of FITS files being recorded nightly and transferred from La Palma to the FACT archive at ISDC in Switzerland. Since long term storage of hundreds of terabytes of observations data is costly, data compression is mandatory. This paper discusses the design choices that were made to increase the compression ratio and speed of writing of the data with respect to existing compression algorithms. Following a more detailed motivation, the FACT compression algorithm along with the associated I/O layer is discussed. Eventually, the performances of the algorithm is compared to other approaches., Comment: 17 pages, accepted to Astronomy and Computing special issue on astronomical file formats

158. A White Paper on keV sterile neutrino Dark Matter

Author

Marco Drewes, P. Di Bari, Michele Maltoni, N. Anh Ky, B. Suerfu, H. Dorrer, Benjamin Monreal, Ernst W. Otten, Klaus Eberhardt, S. Scholl, P. S. Bhupal Dev, Aldo Ianni, Gianpiero Mangano, F. Hofmann, Joseph A. Formaggio, Volker Hannen, Ch. E. Düllmann, Z. Xing, N. Steinbrink, L. Oberauer, Debasish Borah, Klaus Wendt, Jeroen Franse, V. N. Kornoukhov, O. Dragoun, C. Hassel, Sebastian Kempf, Nick Evans, Sergio Pastor, P. S. Rodrigues da Silva, S. Schönert, L. Gastaldo, M. C. Gonzalez-Garcia, Tobias Lachenmaier, Tesla E. Jeltema, A. Faessler, Nick E. Mavromatos, Kai Zuber, George M. Fuller, José W. F. Valle, A.W. Long, F. Schneider, C. A. de S. Pires, N. Thi Hong Van, Manami Sasaki, Apostolos Pilaftsis, Sergey Eliseev, T. Schwetz, Matteo Agostini, Rathin Adhikari, Maria Archidiacono, F. Suekane, Shun Zhou, A. A. Nozik, M. Bahr, Francesco Shankar, V. Niro, J. Baur, Silvia Pascoli, P. C.-O. Ranitzsch, Dmytro Iakubovskyi, Alexander Merle, Christopher George Tully, Ch. Weinheimer, V. S. Pantuev, Ninetta Saviano, Marco Pallavicini, Carlos S. Frenk, D. Vénos, Alejandro Ibarra, H. J. de Vega, Louis E. Strigari, Robert Shrock, Josef Jochum, Andrii Neronov, Lindley Winslow, Nathalie Palanque-Delabrouille, D. Lhuillier, T. Houdy, T. Araki, Aurel Schneider, T. Kieck, Antonella Garzilli, Yu. N. Novikov, W. Liao, Mei-Yu Wang, Carlo Giunti, Yufeng Li, Ferenc Glück, Steen Hannestad, Alexey Boyarsky, V. Fischer, Fedor Bezrukov, F.M. Fraenkle, Andreas Fleischmann, Maury Goodman, Emmanouil Papastergis, Y. Tsai, M. Durero, Kai Dolde, D. C. Radford, O. Rest, Alex G. Dias, Kathrin Valerius, A. Huber, Igor Tkachev, Julian Heeck, A. de Gouvea, Richard Jacobsson, M. Korzeczek, J. Lesgourgues, Susanne Mertens, Matteo Viel, Norma G. Sanchez, Amol V. Patwardhan, Dean J. Robinson, Mikko Laine, Christian Enss, Stephen J. Parke, Alessandro Mirizzi, Pavel Filianin, Paul Langacker, Jan Hamann, J. Behrens, R. Takahashi, Maximilian Totzauer, Dmitry Gorbunov, M. Vivier, Michael Wurm, Z. Djurcic, Steen Honoré Hansen, Thierry Lasserre, Guido Drexlin, Oleg Ruchayskiy, Nicola Menci, Joachim Wolf, Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique et Atmosphères = Laboratory for Studies of Radiation and Matter in Astrophysics and Atmospheres (LERMA), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY), Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA (UMR_8112)), 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-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-CY Cergy Paris Université (CY), Astronomy, Adhikari, R., Agostini, M., Ky, N. Anh, Araki, T., Archidiacono, M., Bahr, M., Baur, J., Behrens, J., Bezrukov, F., Dev, P. S. Bhupal, Borah, D., Boyarsky, A., de Gouvea, A., Pires, C. A. de S., de Vega, H. J., Dias, A. G., Bari, P. Di, Djurcic, Z., Dolde, K., Dorrer, H., Durero, M., Dragoun, O., Drewes, M., Drexlin, G., Düllmann, C.h. E., Eberhardt, K., Eliseev, S., Enss, C., Evans, N. W., Faessler, A., Filianin, P., Fischer, V., Fleischmann, A., Formaggio, J. A., Franse, J., Fraenkle, F. M., Frenk, C. S., Fuller, G., Gastaldo, L., Garzilli, A., Giunti, C., Glück, F., Goodman, M. C., Gonzalez Garcia, M. C., Gorbunov, D., Hamann, J., Hannen, V., Hannestad, S., Hansen, S. H., Hassel, C., Heeck, J., Hofmann, F., Houdy, T., Huber, A., Iakubovskyi, D., Ianni, A., Ibarra, A., Jacobsson, R., Jeltema, T., Jochum, J., Kempf, S., Kieck, T., Korzeczek, M., Kornoukhov, V., Lachenmaier, T., Laine, M., Langacker, P., Lasserre, T., Lesgourgues, J., Lhuillier, D., Li, Y. F., Liao, W., Long, A. W., Maltoni, M., Mangano, G., Mavromatos, N. E., Menci, N., Merle, A., Mertens, S., Mirizzi, A., Monreal, B., Nozik, A., Neronov, A., Niro, V., Novikov, Y., Oberauer, L., Otten, E., Palanque Delabrouille, N., Pallavicini, M., Pantuev, V. S., Papastergis, E., Parke, S., Pascoli, Silvia, Pastor, S., Patwardhan, A., Pilaftsis, A., Radford, D. C., Ranitzsch, P. C. O., Rest, O., Robinson, D. J., Silva, P. S. Rodrigues da, Ruchayskiy, O., Sanchez, N. G., Sasaki, M., Saviano, N., Schneider, A., Schneider, F., Schwetz, Thoma, Schönert, S., Scholl, S., Shankar, F., Shrock, R., Steinbrink, N., Strigari, L., Suekane, F., Suerfu, B., Takahashi, R., Van, N. Thi Hong, Tkachev, I., Totzauer, M., Tsai, Y., Tully, C. G., Valerius, K., Valle, J. W. F., Venos, D., Viel, Matteo, Vivier, M., Wang, M. Y., Weinheimer, C., Wendt, K., Winslow, L., Wolf, J., Wurm, M., Xing, Z., Zhou, Shuangyong, Zuber, K., Massachusetts Institute of Technology. Department of Physics, Laboratoire de Physique Théorique et Hautes Energies ( LPTHE ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Centre National de la Recherche Scientifique ( CNRS ), Institut de Recherches sur les lois Fondamentales de l'Univers ( IRFU ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, AstroParticule et Cosmologie ( APC - UMR 7164 ), Centre National de la Recherche Scientifique ( CNRS ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Observatoire de Paris-Université Paris Diderot - Paris 7 ( UPD7 ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ), 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-Université de Cergy Pontoise ( UCP ), Université Paris-Seine-Université Paris-Seine-Centre National de la Recherche Scientifique ( CNRS ), USA, GBR, FRA, DEU, Anh Ky, N., Bhupal Dev, P. S., De Gouvea, A., Pires, C. A. D. S., De Vega, H. J., Di Bari, P., Dullmann, Ch. E., Gluck, F., Gonzalez-Garcia, M. C., Palanque-Delabrouille, N., Pascoli, S., Ranitzsch, P. C. -O., Rodrigues Da Silva, P. S., Schwetz, T., Schonert, S., Thi Hong Van, N., Viel, M., Zhou, S., 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)-Observatoire de Paris, and PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)

Subjects
Astrofísica, Sterile neutrino, cosmological model, Cold dark matter, cosmological neutrinos, Physics beyond the Standard Model, [ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph], Dark matter theory, 01 natural sciences, Cosmology, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), White paper, High Energy Physics - Phenomenology (hep-ph), X-RAY-EMISSION, METALLIC MAGNETIC CALORIMETERS, QUANTUM-FIELD THEORY, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], neutrino: dark matter, Cosmological neutrinos, Dark matter experiments, Particle physics - cosmology connection, 010303 astronomy & astrophysics, Physics, dark matter theory, new physics, DOUBLE-BETA-DECAY, hep-ph, neutrino: sterile, Astronomy and Astrophysics, Nuclear & Particles Physics, High Energy Physics - Phenomenology, neutrino: detector, particle physics - cosmology connection, astro-ph.CO, MILKY-WAY SATELLITES, 3.5 KEV LINE, Neutrino, Particle Physics - Experiment, Astrophysics - Cosmology and Nongalactic Astrophysics, Particle physics, Astrophysics and Astronomy, Cosmology and Nongalactic Astrophysics (astro-ph.CO), astro-ph.GA, Dark matter, LY-ALPHA FOREST, review, FOS: Physical sciences, Context (language use), neutrino: production, X-ray, Settore FIS/05 - Astronomia e Astrofisica, [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex], RIGHT-HANDED NEUTRINOS, 0103 physical sciences, Astronomical And Space Sciences, numerical calculations, Dark matter experiment, XMM-NEWTON OBSERVATIONS, neutrino: model, Particle Physics - Phenomenology, DWARF SPHEROIDAL GALAXY, Cosmologia, 010308 nuclear & particles physics, hep-ex, dark matter experiments, High Energy Physics::Phenomenology, Atomic, Molecular, Nuclear, Particle And Plasma Physics, Cosmological neutrino, Astrophysics - Astrophysics of Galaxies, 13. Climate action, Astrophysics of Galaxies (astro-ph.GA), [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], [ PHYS.HPHE ] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], High Energy Physics::Experiment, neutrino: oscillation, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

We present a comprehensive review of keV-scale sterile neutrino Dark Matter, collecting views and insights from all disciplines involved - cosmology, astrophysics, nuclear, and particle physics - in each case viewed from both theoretical and experimental/observational perspectives. After reviewing the role of active neutrinos in particle physics, astrophysics, and cosmology, we focus on sterile neutrinos in the context of the Dark Matter puzzle. Here, we first review the physics motivation for sterile neutrino Dark Matter, based on challenges and tensions in purely cold Dark Matter scenarios. We then round out the discussion by critically summarizing all known constraints on sterile neutrino Dark Matter arising from astrophysical observations, laboratory experiments, and theoretical considerations. In this context, we provide a balanced discourse on the possibly positive signal from X-ray observations. Another focus of the paper concerns the construction of particle physics models, aiming to explain how sterile neutrinos of keV-scale masses could arise in concrete settings beyond the Standard Model of elementary particle physics. The paper ends with an extensive review of current and future astrophysical and laboratory searches, highlighting new ideas and their experimental challenges, as well as future perspectives for the discovery of sterile neutrinos., v2: 257 pages, 57 figures, content matches published version [JCAP01(2017)025]; over 100 authors from several different communities

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159. An exploration of hadronic interactions in blazars using IceCube

Author

Andrii Neronov, Teresa Montaruli, C. Tchernin, and Juanan Aguilar

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Soft photon, Proton, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Hadron, FOS: Physical sciences, Astronomy and Astrophysics, Context (language use), Astrophysics, Parameter space, 7. Clean energy, 01 natural sciences, 13. Climate action, Space and Planetary Science, 0103 physical sciences, Neutrino, Blazar, Nuclear Experiment, Astrophysics - High Energy Astrophysical Phenomena, 010303 astronomy & astrophysics, Fermi Gamma-ray Space Telescope
Abstract

Context: Hadronic models, involving matter (proton or nuclei) acceleration in blazar jets, imply high energy photon and neutrino emissions due to interactions of high-energy protons with matter and/or radiation in the source environment. Aims: This paper shows that the sensitivity of the IceCube neutrino telescope in its 40-string configuration (IC-40) is already at the level of constraining the parameter space of purely hadronic scenarios of activity of blazars. Methods: Assuming that the entire source power originates from hadronic interactions, and assuming that the models describe the data, we estimate the expected neutrino flux from blazars based on the observed gamma-ray flux by Fermi, simultaneously with IC-40 observations. We consider two cases separately to keep the number of constrainable parameters at an acceptable level: proton-proton or proton-gamma interactions are dominant. Comparing the IC-40 sensitivity to the neutrino flux expected from some of the brightest blazars, we constrain model parameters characterizing the parent high-energy proton spectrum. Results: We find that when pp interactions dominate, some constraints on the primary proton spectrum can be imposed. For instance, for the tightest constrained source 3C 454.3, the very high energy part of the spectra of blazars is constrained to be harder than E^-2 with cut-off energies in the range of Ecut >10^18 eV. When interactions of high-energy protons on soft photon fields dominate, we can find similarly tight constraints on the proton spectrum parameters. [abridged], accepted for publication in A&A

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