Gamma-rays from galaxy clusters: Preliminary evidences and future expectations

Details Gamma-rays from galaxy clusters: Preliminary evidences and future expectations Gamma-rays from galaxy clusters: Preliminary evidences and future expectations

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..587..427c&link_type=abstract

GAMMA 2001: Gamma-Ray Astrophysics 2001. AIP Conference Proceedings, Volume 587, pp. 427-431 (2001).

Astronomy and Astrophysics

Astrophysics

7

Gamma-Ray Sources, Gamma-Ray Bursts, Galaxy Clusters, X- And Gamma-Ray Telescopes And Instrumentation

Scientific paper

We report here the preliminary evidence of a probable association between galaxy clusters and EGRET unidentified gamma-ray sources at high galactic latitude. Most of the clusters likely associated with EGRET sources show evidence of radio emission either because they host radio galaxies/sources in their environments or because they have a radio halo or relic inhabiting their intracluster medium. The cluster radio emission suggests that the relativistic particles (electrons, protons, ...), which are diffusing in the intracluster medium, might be also responsible for their gamma-ray emission. Beyond the spatial associations of clusters with unidentified gamma-ray sources, we further found a correlation between the X-ray luminosity of galaxy clusters and the gamma-ray luminosity of the associated gamma-ray source under the hypothesis that the EGRET sources have the same cluster redshifts. Such an intrinsic correlation strengthens the probability of a true, physical association between galaxy clusters and EGRET gamma-ray sources. .

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