منابع مشابه
The Diffuse Gamma-Ray Background from Supernovae
The diffuse extragalactic γ-ray background in the MeV region is believed to be due to photons from radioactivity produced in supernovae throughout the history of galaxies in the universe. In particular, γ-ray line emission from the decay chain 56Ni→ 56Co → 56Fe provides the dominant photon source (Clayton & Silk 1969). Although iron synthesis occurs in all types of supernovae, the contribution ...
متن کاملOrigin of the high energy extragalactic diffuse gamma ray background.
We show that cosmic rays in external galaxies, groups and clusters rich in gas, with an average flux similar to that observed in the Milky Way, could have produced the observed extragalactic diffuse gamma radiation. PACS numbers: 98.70.Vc, 98.70.Sa, 98.65.Cw Submitted to Physical Review Letters Typeset using REVTEX e-mail: [email protected] e-mail: [email protected]
متن کاملClusters of Galaxies and the Diffuse Gamma Ray Background
We discuss the di use emission of gamma rays and neutrinos from galaxy clusters in the viable models for structure formation in the universe. We use a self-consistent picture for cluster formation and evolution starting from a primordial density perturbation spectrum, and a realistic modelling for the distribution of the intergalactic medium which is abundantly present within galaxy clusters. W...
متن کاملThe Guaranteed Gamma-ray Background
The diffuse extragalactic gamma-ray background (EGRB) above 100 MeV encodes unique information about high-energy processes in the universe. Numerous sources for the EGRB have been proposed, but the two systems which are certain to make some contribution are active galaxies (blazars) as well as normal galaxies. In this paper, we evaluate the contribution to the background from both sources. The ...
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ژورنال
عنوان ژورنال: Physics Reports
سال: 2015
ISSN: 0370-1573
DOI: 10.1016/j.physrep.2015.09.002