Cosmic ray acceleration to ultrahigh energy in radio galaxies
The origin of ultrahigh energy cosmic rays (UHECRs) is an open question. In this proceeding, we first review the general physical requirements that a source must meet for acceleration to 10-100 EeV, including the consideration that the shock is not highly relativistic. We show that shocks in the bac...
| Main Authors: | , , , |
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| Format: | Journal article |
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EDP Sciences
2019
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| _version_ | 1826283741854564352 |
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| author | Matthews, J Bell, A Araudo, A Blundell, K |
| author_facet | Matthews, J Bell, A Araudo, A Blundell, K |
| author_sort | Matthews, J |
| collection | OXFORD |
| description | The origin of ultrahigh energy cosmic rays (UHECRs) is an open question. In this proceeding, we first review the general physical requirements that a source must meet for acceleration to 10-100 EeV, including the consideration that the shock is not highly relativistic. We show that shocks in the backflows of radio galaxies can meet these requirements. We discuss a model in which giant-lobed radio galaxies such as Centaurus A and Fornax A act as slowly-leaking UHECR reservoirs, with the UHECRs being accelerated during a more powerful past episode. We also show that Centaurus A, Fornax A and other radio galaxies may explain the observed anisotropies in data from the Pierre Auger Observatory, before examining some of the difficulties in associating UHECR anisotropies with astrophysical sources. |
| first_indexed | 2024-03-07T01:03:28Z |
| format | Journal article |
| id | oxford-uuid:8a8279e3-a86f-4420-bff8-978661d1ead6 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T01:03:28Z |
| publishDate | 2019 |
| publisher | EDP Sciences |
| record_format | dspace |
| spelling | oxford-uuid:8a8279e3-a86f-4420-bff8-978661d1ead62022-03-26T22:32:00ZCosmic ray acceleration to ultrahigh energy in radio galaxiesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:8a8279e3-a86f-4420-bff8-978661d1ead6Symplectic Elements at OxfordEDP Sciences2019Matthews, JBell, AAraudo, ABlundell, KThe origin of ultrahigh energy cosmic rays (UHECRs) is an open question. In this proceeding, we first review the general physical requirements that a source must meet for acceleration to 10-100 EeV, including the consideration that the shock is not highly relativistic. We show that shocks in the backflows of radio galaxies can meet these requirements. We discuss a model in which giant-lobed radio galaxies such as Centaurus A and Fornax A act as slowly-leaking UHECR reservoirs, with the UHECRs being accelerated during a more powerful past episode. We also show that Centaurus A, Fornax A and other radio galaxies may explain the observed anisotropies in data from the Pierre Auger Observatory, before examining some of the difficulties in associating UHECR anisotropies with astrophysical sources. |
| spellingShingle | Matthews, J Bell, A Araudo, A Blundell, K Cosmic ray acceleration to ultrahigh energy in radio galaxies |
| title | Cosmic ray acceleration to ultrahigh energy in radio galaxies |
| title_full | Cosmic ray acceleration to ultrahigh energy in radio galaxies |
| title_fullStr | Cosmic ray acceleration to ultrahigh energy in radio galaxies |
| title_full_unstemmed | Cosmic ray acceleration to ultrahigh energy in radio galaxies |
| title_short | Cosmic ray acceleration to ultrahigh energy in radio galaxies |
| title_sort | cosmic ray acceleration to ultrahigh energy in radio galaxies |
| work_keys_str_mv | AT matthewsj cosmicrayaccelerationtoultrahighenergyinradiogalaxies AT bella cosmicrayaccelerationtoultrahighenergyinradiogalaxies AT araudoa cosmicrayaccelerationtoultrahighenergyinradiogalaxies AT blundellk cosmicrayaccelerationtoultrahighenergyinradiogalaxies |