2004/01/30 by A. Reimer, A Reimer, R. J. Protheroe +3 · 6 citations
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Blazar #Cherenkov radiation #Context (archaeology) #Cosmic ray #Dark Matter and Cosmic Phenomena #Extragalactic background light #Galaxy #Photon #Radio galaxy #Relativity and Gravitational Theory #Synchrotron radiation #astro-ph
paper · pdf · doi:10.1016/j.newar.2003.12.019
published in New Astronomy Reviews 48(5-6), 411-413 (Elsevier BV) · 12 pages, 4 figures, accepted for publication in A&A
openalex publication_date 2004/01/30 · arxiv created 2004/02/11 · arxiv updated 2009/12/01 · openalex created_date 2017/10/20 · openalex updated_date 2026/08/05
The giant radio galaxy M87 is usually classified as a Fanaroff-Riley class I source, suggesting that M87 is a mis-aligned BL Lac object. Its unresolved nuclear region emits strong non-thermal emission from radio to X-rays which has been interpreted as synchrotron radiation. In an earlier paper we predicted M87 as a source of detectable gamma ray emission in the context of the hadronic Synchrotron-Proton Blazar (SPB) model. The subsequent tentative detection of TeV energy photons by the HEGRA-telescope array would, if confirmed, make it the first radio galaxy to be detected at TeV-energies. We discuss the emission from the unresolved nuclear region of M87 in the context of the SPB model, and give examples of possible model representations of its non-simultaneous spectral energy distribution. The low-energy component can be explained as synchrotron radiation by a primary relativistic electron population that is injected together with energetic protons into a highly magnetized emission region. We find that the gamma-ray power output is dominated either by mu/pi-synchrotron or proton synchrotron radiation depending on whether the primary electron synchrotron component peaks at low or high energies, respectively. The predicted gamma-ray luminosity peaks at around 100 GeV at a level comparable to that of the low-energy hump, and this makes M87 a promising candidate source for the newly-commissioned high-sensitivity low-threshold Cherenkov telescopes H.E.S.S., VERITAS, MAGIC and CANGAROO III. (abridged)