Cosmic ray acceleration to ultrahigh energy in radio galaxies
| Autor: | Katherine M. Blundell, Anthony R. Bell, James Matthews, Anabella T. Araudo |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
High Energy Astrophysical Phenomena (astro-ph.HE)
Pierre Auger Observatory Physics 010308 nuclear & particles physics Radio galaxy QC1-999 Astrophysics::High Energy Astrophysical Phenomena Centaurus A Astrophysics::Instrumentation and Methods for Astrophysics FOS: Physical sciences Cosmic ray Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics - Astrophysics of Galaxies 01 natural sciences Shock (mechanics) Acceleration Astrophysics of Galaxies (astro-ph.GA) 0103 physical sciences Ultrahigh energy Astrophysics - High Energy Astrophysical Phenomena 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics |
| Zdroj: | EPJ Web of Conferences, Vol 210, p 04002 (2019) |
| ISSN: | 2100-014X |
| Popis: | 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. 6 pages, 4 figures. Proceedings of UHECR 2018, 8-12 October 2018, Paris, France |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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