Probing the cosmic ray population of the giant elliptical galaxy M 87 with observed TeVγ-rays

Open Access

1 September 2003

journal article
letter
Published by EDP Sciences in Astronomy & Astrophysics

Vol. 407 (3) , L73-L77
https://doi.org/10.1051/0004-6361:20031088

Abstract

We examine the cosmic ray proton (CRp) population within the giant elliptical galaxy M 87 using the TeV γ-ray detection of the HEGRA collaboration. In our scenario, the γ-rays are produced by decaying pions which result from hadronic CRp interactions with thermal gas of the interstellar medium of M 87. By comparing the γ-ray emission to upper limits from EGRET, we constrain the spectral index of the CRp population to within our scenario. Both the expected radial γ-ray profile and the required amount of CRp support this hadronic scenario. The accompanying radio mini-halo of hadronically originating cosmic ray electrons is outshone by the synchrotron emission of the relativistic jet of M 87 by one order of magnitude. According to our predictions, the future GLAST mission should allow us to test this hadronic scenario.

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