Gamma-ray astrophysics

Fichtel, C. E.

doi:10.1007/bf02186864

Cited by 12 publications

(1 citation statement)

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“…Evidence for the existence of diffuse gamma ray background was first reported by Kraushaar et al (1972) on the basis of data from OSO-3 satellite. It was followed by SAS-2 satellite (Fichtel et al 1975Fichtel 1977;Fichtel et al 1978) which indicated the presence of a residual, apparently isotropic emission that interpreted as not being associated with the galaxy. It was followed by EGRET (Sreekumar et al 1998) which provided the opportunity of studying the extragalactic emission in greater detail.…”

Section: Introductionmentioning

confidence: 99%

Extragalactic Gamma Ray Excess from Coma Supercluster Direction

Davoudifar

Fatemi

2011

J Astrophys Astron

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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) 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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Section: Introductionmentioning

confidence: 99%