Supernovae in clusters of massive stars as cosmic ray pevatrons
| Autor: | Donald C. Ellison, S. M. Osipov, A. M. Bykov, Petr Gladilin |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
Nuclear and High Energy Physics Particle physics Astrophysics::High Energy Astrophysical Phenomena Gamma ray Cosmic ray Astrophysics::Cosmology and Extragalactic Astrophysics LOFAR Astrophysics 01 natural sciences Galaxy Supernova Stars Observatory 0103 physical sciences Neutrino 010306 general physics 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics |
| Zdroj: | Nuclear and Particle Physics Proceedings. :183-193 |
| ISSN: | 2405-6014 |
| Popis: | New observations of high-energy cosmic rays (CRs), gamma-rays and neutrinos have caused an intense debate about their origin. Detection of the most powerful astrophysical neutrinos with E > 10 15 eV by IceCube and detection of the light composition of the CR spectrum above the ‘knee’ made by LOFAR frame have intensified the debate over whether the sources are galactic or extragalactic. H.E.S.S. observations of very high-energy gamma-emission from compact galactic stellar clusters Westerlund 1 and Cl*1806-20 are also important for developing a model for a galactic PeVatron. We argue that expanding young supernova (SN) shells in compact stellar clusters can be very efficient PeV CR accelerators. The energy spectrum of protons in such an accelerator is hard with a broad spectral upturn above TeV before a break at multi-PeV energies, providing a large energy flux in the high-energy end of the spectrum. The acceleration stage in the colliding shock flow lasts for a few hundred years after the supernova explosion producing high-energy CRs that escape the accelerator and diffuse through the ambient matter producing gamma-rays and neutrinos in inelastic interacions with the ambient matter. Known supernova remnants interacting with stellar winds in the compact clusters of young massive stars Westerlund I and Cl*1806-20 can be associated with the sources of the TeV regime gamma-emission detected by H.E.S.S. and can be responsible for a fraction of the high-energy neutrinos detected with the IceCube observatory. We argue that these high-energy CR accelerators may also provide the light CR galactic component detected by LOFAR. |
| Databáze: | OpenAIRE |
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