Cosmic Rays from the Nucleus of M87

Details Cosmic Rays from the Nucleus of M87 Cosmic Rays from the Nucleus of M87

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....2..695d&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

Scientific paper

The unresolved nuclear region of M87 emits strong non-thermal emission from radio to X-rays, and this has been interpreted as jet emission from a misaligned BL Lac object in the context of the Synchrotron Proton Blazar (SPB) model (Prothero e et al 2003). In this model extragalactic cosmic rays are generated as neutrons produced in pion photopro duction interactions decaying into protons after escaping from the host galaxy. Because energetic protons are deflected by the intergalactic magnetic field, the protons from the decay of neutrons emitted in all directions, including along the jet axis where the Doppler factor and hence emitted neutron energies are higher, can contribute to the observed ultra-high energy cosmic rays. We consider the propagation of these cosmic ray protons to Earth and conclude that M87 could account for the observed flux if the extragalactic magnetic field top ology were favourable.

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