TeV gamma rays and cosmic rays from the nucleus of M87, a mis-aligned BL Lac object

Details TeV gamma rays and cosmic rays from the nucleus of M87, a mis-aligned BL Lac object TeV gamma rays and cosmic rays from the nucleus of M87, a mis-aligned BL Lac object

2002-10-11

arxiv.org/abs/astro-ph/0210249v2

Astropart.Phys. 19 (2003) 559-568

Astronomy and Astrophysics

Astrophysics

17 pages, 6 figures. 3 additional references plus minor changes, acctepted for publication in Astroparticle Physics

Scientific paper

10.1016/S0927-6505(02)00268-2

The unresolved nuclear region of M87 emits strong non-thermal emission from radio to X-rays. Assuming this emission to originate in the pc scale jet aligned at $\theta \sim 30^\circ$ to the line of sight, we interpret this emission in the context of the Synchrotron Proton Blazar (SPB) model. We find the observed nuclear jet emission to be consistent with M87 being a mis-aligned BL Lac Object and predict gamma-ray emission extending up to at least 100 GeV at a level easily detectable by GLAST and MAGIC, and possibly by VERITAS depending on whether it is high-frequency or low-frequency peaked. Predicted neutrino emission is below the sensitivity of existing and planned neutrino telescopes. Ultra-high energy neutrons produced in pion photoproduction interactions decay 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 topology were favourable.

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