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7 results on '"Cosmic ray source"'

1. The Discovery of a Low-energy Excess in Cosmic-Ray Iron: Evidence of the Past Supernova Activity in the Local Bubble

Author

D. Grandi, Massimo Gervasi, Igor V. Moskalenko, N. Masi, Pier-Giorgio Rancoita, Lucio Quadrani, Davide Rozza, G. Jóhannesson, Mauro Tacconi, Matteo Boschini, S. Pensotti, T. A. Porter, S. Della Torre, G. La Vacca, Boschini, M, Della Torre, S, Gervasi, M, Grandi, D, Jóhannesson, G, La Vacca, G, Masi, N, Moskalenko, I, Pensotti, S, Porter, T, Quadrani, L, Rancoita, P, Rozza, D, and Tacconi, M

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), Physics, FOS: Physical sciences, Interplanetary medium, Astronomy and Astrophysics, Cosmic ray, Astrophysics, Spectral line, Article, Galactic cosmic ray, Interstellar medium, Supernova, Heliosphere, FIS/05 - ASTRONOMIA E ASTROFISICA, Local Bubble, FIS/01 - FISICA SPERIMENTALE, Space and Planetary Science, Cosmic ray detector, Cosmic ray source, Ionization energy, Astrophysics - High Energy Astrophysical Phenomena
Abstract

Since its launch, the Alpha Magnetic Spectrometer - 02 (AMS-02) has delivered outstanding quality measurements of the spectra of cosmic-ray (CR) species, $\bar{p}$, $e^{\pm}$, and nuclei, $_1$H-$_8$O, $_{10}$Ne, $_{12}$Mg, $_{14}$Si, which resulted in a number of breakthroughs. One of the latest long awaited surprises is the spectrum of $_{26}$Fe just published by AMS-02. Because of the large fragmentation cross section and large ionization energy losses, most of CR iron at low energies is local, and may harbor some features associated with relatively recent supernova (SN) activity in the solar neighborhood. Our analysis of new iron spectrum together with Voyager 1 and ACE-CRIS data reveals an unexpected bump in the iron spectrum and in the Fe/He, Fe/O, and Fe/Si ratios at 1-2 GV, while a similar feature in the spectra of He, O, Si, and in their ratios is absent, hinting at a local source of low-energy CRs. The found excess fits well with recent discoveries of radioactive $^{60}$Fe deposits in terrestrial and lunar samples, and in CRs. We provide an updated local interstellar spectrum (LIS) of iron in the energy range from 1 MeV nucleon$^{-1}$ to $\sim$10 TeV nucleon$^{-1}$. Our calculations employ the GalProp-HelMod framework that is proved to be a reliable tool in deriving the LIS of CR $\bar{p}$, $e^{-}$, and nuclei $Z\le28$., 12 pages, 9 figures, 5 tables; Accepted for publication in the Astrophysical Journal. arXiv admin note: text overlap with arXiv:2006.01337

Published
2021

2. The Discovery of a Low-energy Excess in Cosmic-Ray Iron: Evidence of the Past Supernova Activity in the Local Bubble

Abstract

Since its launch, the Alpha Magnetic Spectrometer - 02 (AMS-02) has delivered outstanding quality measurements of the spectra of cosmic-ray (CR) species (, e , and nuclei, 1H-8O, 10Ne, 12Mg, 14Si) which resulted in a number of breakthroughs. One of the latest long-awaited surprises is the spectrum of 26Fe just published by AMS-02. Because of the large fragmentation cross section and large ionization energy losses, most of CR iron at low energies is local and may harbor some features associated with relatively recent supernova (SN) activity in the solar neighborhood. Our analysis of the new AMS-02 results, together with Voyager 1 and ACE-CRIS data, reveals an unexpected bump in the iron spectrum and in the Fe/He, Fe/O, and Fe/Si ratios at 1-2 GV, while a similar feature in the spectra of He, O, and Si and in their ratios is absent, hinting at a local source of low-energy CRs. The found excess extends the recent discoveries of radioactive 60Fe deposits in terrestrial and lunar samples and in CRs. We provide an updated local interstellar spectrum (LIS) of iron in the energy range from 1 MeV nucleon-1 to ∼10 TeV nucleon-1. Our calculations employ the GalProp-HelMod framework, which has proved to be a reliable tool in deriving the LIS of CR , e -, and nuclei Z ≤ 28.

Published
2021

3. The Alpha Magnetic Spectrometer (AMS) on the international space station: Part II – Results from the first seven years

Abstract

The Alpha Magnetic Spectrometer (AMS) is a precision particle physics detector on the International Space Station (ISS) conducting a unique, long-duration mission of fundamental physics research in space. The physics objectives include the precise studies of the origin of dark matter, antimatter, and cosmic rays as well as the exploration of new phenomena. Following a 16-year period of construction and testing, and a precursor flight on the Space Shuttle, AMS was installed on the ISS on May 19, 2011. In this report we present results based on 120 billion charged cosmic ray events up to multi-TeV energies. This includes the fluxes of positrons, electrons, antiprotons, protons, and nuclei. These results provide unexpected information, which cannot be explained by the current theoretical models. The accuracy and characteristics of the data, simultaneously from many different types of cosmic rays, provide unique input to the understanding of origins, acceleration, and propagation of cosmic rays.

Published
2021

4. The Alpha Magnetic Spectrometer (AMS) on the international space station : Part II : Results from the first seven years

Author

Roberto Battiston, X. M. Qi, R. Sonnabend, Massimo Gervasi, B. Borgia, M. Pohl, Rami Vainio, W. Hungerford, M. Vecchi, H. D. Phan, F. Zhao, M. Capell, J. Marquardt, Ignazio Lazzizzera, F. Barao, G. Schwering, C. Consolandi, Pier-Giorgio Rancoita, M. Pauluzzi, M. Graziani, Liqiu Wang, Y. J. Yu, S. Başeğmez-du Pree, V. Formato, Julio C. Marín, Xiaoqun Wang, Y. Yang, W Xu, F. Machate, M. Aguilar, H. Y. Chou, Z. Cui, K. C. Han, A. Pashnin, Thomas Lippert, K. H. Guo, A. Lebedev, S. Li, Q. L. Wang, Fan Zhang, Lin Cheng, S. Di Falco, Z Liu, G. Ambrosi, A. Kuhlman, S Wang, C. Delgado, P. H. Fisher, Roald Z. Sagdeev, S. M. Ting, Z. L. Weng, D. Rapin, V. Plyaskin, Corrado Gargiulo, F. Giovacchini, X. W. Tang, C. Freeman, S. Della Torre, S. Porter, S. S. Lyu, Timothy H. Hsieh, S. Rosier-Lees, P. Mott, Ilya Usoskin, Mauro Tacconi, F. Palmonari, B. S. Shan, Zhixiang Tang, M. B. Demirköz, M. Li, Zhiqi Huang, E. Valente, J. Q. Li, M. Konyushikhin, Chuanguo Zhang, Zhen Sun, G. N. Kim, Zhihua Zhang, Yi Jia, N. Attig, O. Kounina, H. Wu, J. P. Vialle, R. K. Hashmani, Naihua Wang, H. L. Zhuang, Valery Zhukov, S. C. Lee, C. Clark, Z. Y. Qu, Andrea Contin, G. Coignet, S. Chouridou, C. Leluc, R. J. García-López, J. D. Burger, S. M. Schmidt, L Mussolin, T. Siedenburg, G. Martinez, J. J. Torsti, S. Pensotti, Antonino Zichichi, M. Orcinha, F. Dimiccoli, Yaomin Dai, G. La Vacca, M. Incagli, Corinne Goy, Z. M. Zheng, K. Bollweg, G. Castellini, J Wei, L. Ali Cavasonza, S. Q. Lu, J. Z. Luo, Claudio Corti, M. Vazquez Acosta, K. Dadzie, Yung Huang Chang, A.I. Oliva, Qie Sun, C. Solano, V. Choutko, Z. H. He, F. Nozzoli, K. Luebelsmeyer, A. Kulemzin, A. Eline, X. Qin, David Maurin, B. Beischer, C. Mañá, Veronica Bindi, V. Di Felice, J. Y. Shi, G. Laurenti, M. Molero, Jun Hu, Arturo Alejandro Menchaca-Rocha, J. Berdugo, E. Fiandrini, T. Kirn, C. Light, H. S. Chen, L. Quadrani, Luísa Arruda, S. Burmeister, M. Bourquin, B. Khiali, Eun-Suk Seo, M. Palermo, Ying Lu, A. Bartoloni, J. Bates, J. H. Zhang, Mario Zannoni, K. Kanishev, Nicola Tomassetti, P. Zuccon, V. Koutsenko, Eino Valtonen, T. Urban, R. Q. Xiong, Z. H. Li, Qiang Li, Mayda Velasco, H. Jinchi, D M Gómez-Coral, D. Grandi, S. Schael, B. Bertucci, C. H. Chung, C. Gámez, D. C. Mo, N. Masi, L. Barrin, M. Behlmann, P. von Doetinchem, X. D. Cai, Elisa Laudi, Laurent Derome, Q. Meng, F. Donnini, A. Schulz von Dratzig, Andrei Kounine, Q. Yan, Sadakazu Haino, C. Tüysüz, N. Zimmermann, Zhao Wang, Z. Q. Yu, F. Dong, Fajun Zhang, Jonathan L. Feng, V Vagelli, Y. Chen, N. Nikonov, T. Martin, J. W. Song, M. Duranti, J. Casaus, J. Q. Ni, E F Bueno, A. Egorov, M. Paniccia, J Tian, Carlos Díaz, Bernd Heber, W. De Boer, H. Yi, Yu. Galaktionov, H. T. Lee, D. Rozza, W. J. Burger, Samuel C.C. Ting, F. Cervelli, Matteo Boschini, Henning Gast, A. Rozhkov, T. X. Li, Varlen Grabski, A. Reina Conde, I. Gebauer, W. Y. Jang, Guo-Ming Chen, Chia-Hui Lin, J. Gong, Laboratoire d'Annecy de Physique des Particules (LAPP), 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), AMS, Aguilar M., Ali Cavasonza L., Ambrosi G., Arruda L., Attig N., Barao F., Barrin L., Bartoloni A., Basegmez-du Pree S., Bates J., Battiston R., Behlmann M., Beischer B., Berdugo J., Bertucci B., Bindi V., de Boer W., Bollweg K., Borgia B., Boschini M.J., Bourquin M., Bueno E.F., Burger J., Burger W.J., Burmeister S., Cai X.D., Capell M., Casaus J., Castellini G., Cervelli F., Chang Y.H., Chen G.M., Chen H.S., Chen Y., Cheng L., Chou H.Y., Chouridou S., Choutko V., Chung C.H., Clark C., Coignet G., Consolandi C., Contin A., Corti C., Cui Z., Dadzie K., Dai Y.M., Delgado C., Della Torre S., Demirkoz M.B., Derome L., Di Falco S., Di Felice V., Diaz C., Dimiccoli F., von Doetinchem P., Dong F., Donnini F., Duranti M., Egorov A., Eline A., Feng J., Fiandrini E., Fisher P., Formato V., Freeman C., Galaktionov Y., Gamez C., Garcia-Lopez R.J., Gargiulo C., Gast H., Gebauer I., Gervasi M., Giovacchini F., Gomez-Coral D.M., Gong J., Goy C., Grabski V., Grandi D., Graziani M., Guo K.H., Haino S., Han K.C., Hashmani R.K., He Z.H., Heber B., Hsieh T.H., Hu J.Y., Huang Z.C., Hungerford W., Incagli M., Jang W.Y., Jia Y., Jinchi H., Kanishev K., Khiali B., Kim G.N., Kirn T., Konyushikhin M., Kounina O., Kounine A., Koutsenko V., Kuhlman A., Kulemzin A., La Vacca G., Laudi E., Laurenti G., Lazzizzera I., Lebedev A., Lee H.T., Lee S.C., Leluc C., Li J.Q., Li M., Li Q., Li S., Li T.X., Li Z.H., Light C., Lin C.H., Lippert T., Liu Z., Lu S.Q., Lu Y.S., Luebelsmeyer K., Luo J.Z., Lyu S.S., Machate F., Mana C., Marin J., Marquardt J., Martin T., Martinez G., Masi N., Maurin D., Menchaca-Rocha A., Meng Q., Mo D.C., Molero M., Mott P., Mussolin L., Ni J.Q., Nikonov N., Nozzoli F., Oliva A., Orcinha M., Palermo M., Palmonari F., Paniccia M., Pashnin A., Pauluzzi M., Pensotti S., Phan H.D., Plyaskin V., Pohl M., Porter S., Qi X.M., Qin X., Qu Z.Y., Quadrani L., Rancoita P.G., Rapin D., Reina Conde A., Rosier-Lees S., Rozhkov A., Rozza D., Sagdeev R., Schael S., Schmidt S.M., Schulz von Dratzig A., Schwering G., Seo E.S., Shan B.S., Shi J.Y., Siedenburg T., Solano C., Song J.W., Sonnabend R., Sun Q., Sun Z.T., Tacconi M., Tang X.W., Tang Z.C., Tian J., Ting S.C.C., Ting S.M., Tomassetti N., Torsti J., Tuysuz C., Urban T., Usoskin I., Vagelli V., Vainio R., Valente E., Valtonen E., Vazquez Acosta M., Vecchi M., Velasco M., Vialle J.P., Wang L.Q., Wang N.H., Wang Q.L., Wang S., Wang X., Wang Z.X., Wei J., Weng Z.L., Wu H., Xiong R.Q., Xu W., Yan Q., Yang Y., Yi H., Yu Y.J., Yu Z.Q., Zannoni M., Zhang C., Zhang F., Zhang F.Z., Zhang J.H., Zhang Z., Zhao F., Zheng Z.M., Zhuang H.L., Zhukov V., Zichichi A., Zimmermann N., Zuccon P., Aguilar, M, Ali Cavasonza, L, Ambrosi, G, Arruda, L, Attig, N, Barao, F, Barrin, L, Bartoloni, A, Başeğmez-du Pree, S, Bates, J, Battiston, R, Behlmann, M, Beischer, B, Berdugo, J, Bertucci, B, Bindi, V, de Boer, W, Bollweg, K, Borgia, B, Boschini, M, Bourquin, M, Bueno, E, Burger, J, Burger, W, Burmeister, S, Cai, X, Capell, M, Casaus, J, Castellini, G, Cervelli, F, Chang, Y, Chen, G, Chen, H, Chen, Y, Cheng, L, Chou, H, Chouridou, S, Choutko, V, Chung, C, Clark, C, Coignet, G, Consolandi, C, Contin, A, Corti, C, Cui, Z, Dadzie, K, Dai, Y, Delgado, C, Della Torre, S, Demirköz, M, Derome, L, Di Falco, S, Di Felice, V, Díaz, C, Dimiccoli, F, von Doetinchem, P, Dong, F, Donnini, F, Duranti, M, Egorov, A, Eline, A, Feng, J, Fiandrini, E, Fisher, P, Formato, V, Freeman, C, Galaktionov, Y, Gámez, C, García-López, R, Gargiulo, C, Gast, H, Gebauer, I, Gervasi, M, Giovacchini, F, Gómez-Coral, D, Gong, J, Goy, C, Grabski, V, Grandi, D, Graziani, M, Guo, K, Haino, S, Han, K, Hashmani, R, He, Z, Heber, B, Hsieh, T, Hu, J, Huang, Z, Hungerford, W, Incagli, M, Jang, W, Jia, Y, Jinchi, H, Kanishev, K, Khiali, B, Kim, G, Kirn, T, Konyushikhin, M, Kounina, O, Kounine, A, Koutsenko, V, Kuhlman, A, Kulemzin, A, La Vacca, G, Laudi, E, Laurenti, G, Lazzizzera, I, Lebedev, A, Lee, H, Lee, S, Leluc, C, Li, J, Li, M, Li, Q, Li, S, Li, T, Li, Z, Light, C, Lin, C, Lippert, T, Liu, Z, Lu, S, Lu, Y, Luebelsmeyer, K, Luo, J, Lyu, S, Machate, F, Mañá, C, Marín, J, Marquardt, J, Martin, T, Martínez, G, Masi, N, Maurin, D, Menchaca-Rocha, A, Meng, Q, Mo, D, Molero, M, Mott, P, Mussolin, L, Ni, J, Nikonov, N, Nozzoli, F, Oliva, A, Orcinha, M, Palermo, M, Palmonari, F, Paniccia, M, Pashnin, A, Pauluzzi, M, Pensotti, S, Phan, H, Plyaskin, V, Pohl, M, Porter, S, Qi, X, Qin, X, Qu, Z, Quadrani, L, Rancoita, P, Rapin, D, Reina Conde, A, Rosier-Lees, S, Rozhkov, A, Rozza, D, Sagdeev, R, Schael, S, Schmidt, S, Schulz von Dratzig, A, Schwering, G, Seo, E, Shan, B, Shi, J, Siedenburg, T, Solano, C, Song, J, Sonnabend, R, Sun, Q, Sun, Z, Tacconi, M, Tang, X, Tang, Z, Tian, J, Ting, S, Tomassetti, N, Torsti, J, Tüysüz, C, Urban, T, Usoskin, I, Vagelli, V, Vainio, R, Valente, E, Valtonen, E, Vázquez Acosta, M, Vecchi, M, Velasco, M, Vialle, J, Wang, L, Wang, N, Wang, Q, Wang, S, Wang, X, Wang, Z, Wei, J, Weng, Z, Wu, H, Xiong, R, Xu, W, Yan, Q, Yang, Y, Yi, H, Yu, Y, Yu, Z, Zannoni, M, Zhang, C, Zhang, F, Zhang, J, Zhang, Z, Zhao, F, Zheng, Z, Zhuang, H, Zhukov, V, Zichichi, A, Zimmermann, N, Zuccon, P, Astronomy, Bourquin, Maurice, Chen, Yao, Leluc, Catherine, Liu, Zhen, Paniccia, Mercedes, Pohl, Martin, Rapin, Divic Jean, and Wei, Jiahui

Subjects
Space station, detector [cosmic radiation], electron, Cosmic ray composition & spectra, General Physics and Astronomy, Transition radiation detector, Strangelets, positron: flux, 01 natural sciences, Space detectors, cosmic radiation: detector, Cosmic ray detectors, Alpha Magnetic Spectrometer, antimatter, Cosmic ray source, AMS, Particle astrophysic, Physics, cosmic radiation: propagation, anti-p, FIS/01 - FISICA SPERIMENTALE, Antimatter, Cosmic ray propagation, positron, acceleration [cosmic radiation], Particle astrophysics, Cosmic ray composition & spectra, Cosmic ray acceleration, Cosmic ray propagation, Cosmic ray sources, Particle astrophysics, Particle dark matter, Cosmic ray detectors, Alpha Magnetic Spectrometer, International space station, Astrophysics and Astronomy, spectra, Astrophysics::High Energy Astrophysical Phenomena, Dark matter, satellite, Space Shuttle, Cosmic ray, ddc:500.2, Cosmic ray acceleration, dark matter, Nuclear physics, Time of flight, Ring imaging cherenkov, FIS/05 - ASTRONOMIA E ASTROFISICA, Particle dark matter, Electromagnetic calorimeter, 0103 physical sciences, International Space Station, Cosmic ray composition &amp, ddc:530, cosmic radiation: acceleration, 010306 general physics, Cosmic rays, Astroparticle physics, 010308 nuclear & particles physics, International space station, nucleus, electron: flux, Cosmic ray sources, magnetic spectrometer, Cosmic ray physics, Automatic Keywords, Antiproton, Silicon tracker, propagation [cosmic radiation], Cosmic ray detector, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

Physics reports 894, 1-116 (2021). doi:10.1016/j.physrep.2020.09.003 special issue: "The Alpha Magnetic Spectrometer (AMS) on the International Space Station: Part II : Results from the First Seven Years", Published by Elsevier Science, North-Holland, Amsterdam [u.a.]

Published
2021
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5. Inference of the local interstellar spectra of cosmic-ray nuclei Z ≼ 28 with the GALPROP-HELMOD Framework

Author

Mauro Tacconi, Massimo Gervasi, Troy A. Porter, G. Jóhannesson, G. La Vacca, S. Della Torre, N. Masi, L. Quadrani, Igor V. Moskalenko, Pier-Giorgio Rancoita, D. Grandi, S. Pensotti, D. Rozza, Matteo Boschini, Boschini M.J., della Torre S., Gervasi M., Grandi D., Johannesson G., la Vacca G., Masi N., Moskalenko I.V., Pensotti S., Porter T.A., Quadrani L., Rancoita P.G., Rozza D., Tacconi M., Boschini, M, Torre, S, Gervasi, M, Grandi, D, Jóhannesson, G, La Vacca, G, Masi, N, Moskalenko, I, Pensotti, S, Porter, T, Quadrani, L, Rancoita, P, Rozza, D, and Tacconi, M

Subjects
Astrophysics::High Energy Astrophysical Phenomena, Interplanetary medium, Cosmic ray, Astrophysics, 01 natural sciences, Article, Galactic cosmic ray, FIS/05 - ASTRONOMIA E ASTROFISICA, Heliosphere, Cosmic ray detectors, Interstellar medium, 0103 physical sciences, Cosmic ray source, 010306 general physics, 010303 astronomy & astrophysics, Physics, Astronomy and Astrophysics, Abundance of the chemical elements, FIS/01 - FISICA SPERIMENTALE, Orders of magnitude (time), Space and Planetary Science, Antiproton, Antimatter, Astrophysics - High Energy Astrophysical Phenomena
Abstract

Composition and spectra of Galactic cosmic rays (CRs) are vital for studies of high-energy processes in a variety of environments and on different scales, for interpretation of gamma-ray and microwave observations, disentangling possible signatures of new phenomena, and for understanding of our local Galactic neighborhood. Since its launch, AMS-02 has delivered outstanding quality measurements of the spectra of antiprotons, electrons, positrons, and nuclei: H-O, Ne, Mg, Si. These measurements resulted in a number of breakthroughs, however, spectra of heavier nuclei and especially low-abundance nuclei are not expected until later in the mission. Meanwhile, a comparison of published AMS-02 results with earlier data from HEAO-3-C2 indicate that HEAO-3-C2 data may be affected by undocumented systematic errors. Utilizing such data to compensate for the lack of AMS-02 measurements could result in significant errors. In this paper we show that a fraction of HEAO-3-C2 data match available AMS-02 measurements quite well and can be used together with Voyager 1 and ACE-CRIS data to make predictions for the local interstellar spectra (LIS) of nuclei that are not yet released by AMS-02. We are also updating our already published LIS to provide a complete set from H-Ni in the energy range from 1 MeV/nucleon to ~100-500 TeV/nucleon thus covering 8-9 orders of magnitude in energy. Our calculations employ the GalProp-HelMod framework that is proved to be a reliable tool in deriving the LIS of CR antiprotons, electrons, and nuclei H-O., Comment: 90 pages, 36 figures, 60 tables, ApJS; Fixed typos in Eqs.(C2) and (C32)

Published
2020

6. Second-order Fermi Reacceleration Mechanisms and Large-Scale Synchrotron Radio Emission in Intracluster Bridges

Author

Franco Vazza, Gianfranco Brunetti, Brunetti, Gianfranco, and Vazza, Franco

Subjects
X ray astronomy, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Astrophysics::High Energy Astrophysical Phenomena, General Physics and Astronomy, Energy flux, FOS: Physical sciences, Radio, microwave, & sub-mm astronomy, Astrophysics, Electron, Astrophysics::Cosmology and Extragalactic Astrophysics, Low frequency, Cosmic ray acceleration, 01 natural sciences, Relativistic particle, 0103 physical sciences, Cosmic ray source, 010306 general physics, Large scale structure of the Universe, Galaxy cluster, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), LOFAR, Particle acceleration, Physics::Space Physics, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Nongalactic Astrophysics, Fermi Gamma-ray Space Telescope
Abstract

Radio observations at low frequencies with the Low Frequency Array (LOFAR) start discovering gigantic radio bridges connecting pairs of massive galaxy clusters. These observations probe unexplored mechanisms of in situ particle acceleration that operate on volumes of several Mpc$^3$. Numerical simulations suggest that such bridges are dynamically complex and that weak shocks and super-Alfv\'{e}nic turbulence can be driven across the entire volume of these regions. In this Letter we explore, for the first time, the role of second order Fermi mechanisms for the reacceleration of relativistic electrons interacting with turbulence in these peculiar regions. We assume the turbulent energy flux measured in simulations and adopt a scenario in which relativistic particles scatter with magnetic field lines diffusing in super-Alfv\'enic turbulence and magnetic fields are amplified by the same turbulence. We show that steep spectrum and volume filling synchrotron emission can be generated in the entire intra-cluster bridge region thus providing a natural explanation for radio bridges. Consequently, radio observations have the potential to probe the dissipation of energy on scales larger than galaxy clusters and second order Fermi mechanisms operating in physical regimes that are still poorly explored. This has a potential impact on several branches of astrophysics and cosmology., Comment: 5 pages, 3 figures (+ Supplementary Material). Physical Review Letters, in press

Published
2020

7. Neutrino telescopes and high-energy cosmic neutrinos

Author

Francesco Vissani, Maurizio Spurio, Andrea Palladino, Palladino A., Spurio M., and Vissani F.

Subjects
lcsh:QC793-793.5, High energy, topology, Astrophysics::High Energy Astrophysical Phenomena, General Physics and Astronomy, FOS: Physical sciences, Cosmic ray, 7. Clean energy, 01 natural sciences, IceCube, propagation, 0103 physical sciences, ddc:530, Cosmic ray source, detector [neutrino], 010303 astronomy & astrophysics, Physics, High Energy Astrophysical Phenomena (astro-ph.HE), COSMIC cancer database, background, 010308 nuclear & particles physics, lcsh:Elementary particle physics, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy, Observable, cosmic radiation, Neutrino astronomy, 13. Climate action, current [neutrino], cosmic ray sources, atmosphere, Multimessenger astrophysic, multimessenger astrophysics, High Energy Physics::Experiment, Neutrino telescopes, Neutrino, Astrophysics - High Energy Astrophysical Phenomena
Abstract

In this review paper, we present the main aspects of high-energy cosmic neutrino astrophysics. We begin by describing the generic expectations for cosmic neutrinos, including the effects of propagation from their sources to the detectors. Then we introduce the operating principles of current neutrino telescopes, and examine the main features (topologies) of the observable events. After a discussion of the main background processes, due to the concomitant presence of secondary particles produced in the terrestrial atmosphere by cosmic rays, we summarize the current status of the observations with astrophysical relevance that have been greatly contributed by IceCube detector. Then, we examine various interpretations of these findings, trying to assess the best candidate sources of cosmic neutrinos. We conclude with a brief perspective on how the field could evolve within a few years., Comment: 13 figures

Published
2020
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