Extragalactic and galactic sources: New evidence, new challenges, new opportunities
Recent data bring in sharper focus the issue of relative contributions of galactic and extragalactic sources of ultrahigh-energy cosmic rays. On the one hand, there is some new evidence, from gamma-ray observations of blazars, that cosmic rays are, indeed, accelerated in AGNs. On the other hand, rec...
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| Format: | Article |
| Language: | English |
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EDP Sciences
2013-06-01
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| Series: | EPJ Web of Conferences |
| Online Access: | http://dx.doi.org/10.1051/epjconf/20135306006 |
| _version_ | 1818778037253046272 |
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| author | Kusenko Alexander |
| author_facet | Kusenko Alexander |
| author_sort | Kusenko Alexander |
| collection | DOAJ |
| description | Recent data bring in sharper focus the issue of relative contributions of galactic and extragalactic sources of ultrahigh-energy cosmic rays. On the one hand, there is some new evidence, from gamma-ray observations of blazars, that cosmic rays are, indeed, accelerated in AGNs. On the other hand, recent measurements of composition reported by Pierre Auger Observatory can be explained by a contribution of transient galactic sources, such as past GRBs and hypernovae, if nuclei accelerated in such events get trapped in the turbulent galactic magnetic fields. The likely contamination of UHECR data by the nuclei from past galactic stellar explosions creates new challenges for cosmic-ray astronomy. At the same time, it creates new opportunities for reconstructing galactic magnetic fields, understanding the history of transient galactic phenomena, and for using gamma rays to identify astrophysical nuclear accelerators outside Milky Way. |
| first_indexed | 2024-12-18T11:38:21Z |
| format | Article |
| id | doaj.art-5b43927b6bfb4058b705792c901c5301 |
| institution | Directory Open Access Journal |
| issn | 2100-014X |
| language | English |
| last_indexed | 2024-12-18T11:38:21Z |
| publishDate | 2013-06-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | EPJ Web of Conferences |
| spelling | doaj.art-5b43927b6bfb4058b705792c901c53012022-12-21T21:09:28ZengEDP SciencesEPJ Web of Conferences2100-014X2013-06-01530600610.1051/epjconf/20135306006Extragalactic and galactic sources: New evidence, new challenges, new opportunitiesKusenko AlexanderRecent data bring in sharper focus the issue of relative contributions of galactic and extragalactic sources of ultrahigh-energy cosmic rays. On the one hand, there is some new evidence, from gamma-ray observations of blazars, that cosmic rays are, indeed, accelerated in AGNs. On the other hand, recent measurements of composition reported by Pierre Auger Observatory can be explained by a contribution of transient galactic sources, such as past GRBs and hypernovae, if nuclei accelerated in such events get trapped in the turbulent galactic magnetic fields. The likely contamination of UHECR data by the nuclei from past galactic stellar explosions creates new challenges for cosmic-ray astronomy. At the same time, it creates new opportunities for reconstructing galactic magnetic fields, understanding the history of transient galactic phenomena, and for using gamma rays to identify astrophysical nuclear accelerators outside Milky Way.http://dx.doi.org/10.1051/epjconf/20135306006 |
| spellingShingle | Kusenko Alexander Extragalactic and galactic sources: New evidence, new challenges, new opportunities EPJ Web of Conferences |
| title | Extragalactic and galactic sources: New evidence, new challenges, new opportunities |
| title_full | Extragalactic and galactic sources: New evidence, new challenges, new opportunities |
| title_fullStr | Extragalactic and galactic sources: New evidence, new challenges, new opportunities |
| title_full_unstemmed | Extragalactic and galactic sources: New evidence, new challenges, new opportunities |
| title_short | Extragalactic and galactic sources: New evidence, new challenges, new opportunities |
| title_sort | extragalactic and galactic sources new evidence new challenges new opportunities |
| url | http://dx.doi.org/10.1051/epjconf/20135306006 |
| work_keys_str_mv | AT kusenkoalexander extragalacticandgalacticsourcesnewevidencenewchallengesnewopportunities |