Extragalactic Gamma Ray Excess from Coma Supercluster Direction

Details Extragalactic Gamma Ray Excess from Coma Supercluster Direction Extragalactic Gamma Ray Excess from Coma Supercluster Direction

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011japa...32..359d&link_type=abstract

Journal of Astrophysics and Astronomy, Volume 32, Issue 3, pp.359-370

Astronomy and Astrophysics

Astrophysics

Scientific paper

The origin of extragalactic diffuse gamma ray is not accurately known, especially because our suggestions are related to many models that need to be considered either to compute the galactic diffuse gamma ray intensity or to consider the contribution of other extragalactic structures while surveying a specific portion of the sky. More precise analysis of EGRET data however, makes it possible to estimate the diffuse gamma ray in Coma supercluster (i.e., Coma A1367 supercluster) direction with a value of I ( {E>{30} MeV} )˜eq{1.9}× {10}^{-{6}} cm^{-{2}} s^{-{1}} , which is considered to be an upper limit for the diffuse gamma ray due to Coma supercluster. The related total intensity (on average) is calculated to be 5% of the actual diffuse extragalactic background. The calculated intensity makes it possible to estimate the origin of extragalactic diffuse gamma ray.

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