Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..587..422r&link_type=abstract
GAMMA 2001: Gamma-Ray Astrophysics 2001. AIP Conference Proceedings, Volume 587, pp. 422-426 (2001).
Astronomy and Astrophysics
Astrophysics
3
Galaxy Clusters, Gamma-Ray Sources, Gamma-Ray Bursts, X- And Gamma-Ray Telescopes And Instrumentation
Scientific paper
Various emission mechanism suggest clusters of galaxies to exhibit high-energy gamma-ray radiation. Galaxy clusters are predicted to be at the edge of the instrumental sensitivity currently accessible with gamma-ray telescopes. It is suggested that galaxy clusters contribute to the extragalactic diffuse background and, in few individual cases, they might be already detectable as individual sources. On the assumption that a flux limited sample of X-ray bright clusters will suit as a reasonable selection, gamma-ray fluxes (E>100 MeV) are determined using EGRET data throughout the entire CGRO mission. In order to investigate beyond the case of the individual X-ray bright cluster, the gamma-ray data of individual clusters are cumulative stacked in a cluster-centered coordinate system and the resulting images have been analyzed. The results from EGRET are given and discussed in the light of predictions already found in the literature as well as in perspective of upcoming gamma-ray mission like INTEGRAL and, primarily, GLAST .
Reimer Olaf
Sreekumar Parameswaran
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