Unidentified EGRET Sources and the Extragalactic Gamma-Ray Background

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dc.creatorPavlidou, V.
dc.creatorSiegal-Gaskins, J. M.
dc.creatorBrown, C.
dc.creatorFields, B. D.
dc.creatorOlinto, A. V.
dc.date2006-11-08
dc.date.accessioned2026-07-07T10:40:48Z
dc.date.available2026-07-07T10:40:48Z
dc.descriptionThe large majority of EGRET point sources remain to this day without an identified low-energy counterpart. Whatever the nature of the EGRET unidentified sources, faint unresolved objects of the same class must have a contribution to the diffuse gamma-ray background: if most unidentified objects are extragalactic, faint unresolved sources of the same class contribute to the background, as a distinct extragalactic population; on the other hand, if most unidentified sources are Galactic, their counterparts in external galaxies will contribute to the unresolved emission from these systems. Understanding this component of the gamma-ray background, along with other guaranteed contributions from known sources, is essential in any attempt to use gamma-ray observations to constrain exotic high-energy physics. Here, we follow an empirical approach to estimate whether a potential contribution of unidentified sources to the extragalactic gamma-ray background is likely to be important, and we find that it is. Additionally, we comment on how the anticipated GLAST measurement of the diffuse gamma-ray background will change, depending on the nature of the majority of these sources.
dc.description6 pages, 3 figures, to appear in proceedings of "The Multi-Messenger Approach to High Energy Gamma-Ray Sources", Barcelona, 4-7 July 2006; comments welcome
dc.identifierhttps://arxiv.org/abs/astro-ph/0611271
dc.identifierhttp://arxiv.org/abs/astro-ph/0611271
dc.identifierAstrophys.SpaceSci.309:81-87,2007
dc.identifierdoi:10.1007/s10509-007-9456-1
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/181441
dc.subjectAstrophysics
dc.titleUnidentified EGRET Sources and the Extragalactic Gamma-Ray Background
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