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Title:
Unresolved Unidentified Source Contribution to the Gamma-Ray Background
Authors:
Pavlidou, V.; Siegal-Gaskins, J. M.; Fields, B. D.; Olinto, A. V.; Brown, C.
Affiliation:
AA(Kavli Institute of Cosmological Physics, University of Chicago, Chicago, IL 60637.; Enrico Fermi Institute, University of Chicago, Chicago, IL 60637.), AB(Kavli Institute of Cosmological Physics, University of Chicago, Chicago, IL 60637.; Department of Physics, University of Chicago, Chicago, IL 60637.), AC(Department of Astronomy, University of Illinois at Urbana-Champaign, Urbana, IL 61801.), AD(Kavli Institute of Cosmological Physics, University of Chicago, Chicago, IL 60637.; Enrico Fermi Institute, University of Chicago, Chicago, IL 60637.; Laboratoire Astroparticule et Cosmologie (APC), Université Paris7/CNRS, 10 rue A. Domonet L. Duquet, 75205 Paris, Cedex13, France.), AE(Department of Physics, University of Chicago, Chicago, IL 60637.)
Publication:
The Astrophysical Journal, Volume 677, Issue 1, pp. 27-36. (ApJ Homepage)
Publication Date:
04/2008
Origin:
UCP
ApJ Keywords:
Gamma Rays: Observations, Gamma Rays: Theory, Cosmology: Diffuse Radiation
Abstract Copyright:
(c) 2008: The American Astronomical Society
DOI:
10.1086/524723
Bibliographic Code:
2008ApJ...677...27P

Abstract

The large majority of EGRET point sources remain without an identified low-energy counterpart, and a large fraction of these sources are most likely extragalactic. Whatever the nature of the extragalactic EGRET unidentified sources, faint unresolved objects of the same class must have a contribution to the diffuse extragalactic gamma-ray background (EGRB). Understanding this component of the EGRB, along with other guaranteed contributions from known sources, is essential if we are to use this emission to constrain exotic high-energy physics. Here, we follow an empirical approach to estimate whether a potential contribution of unidentified sources to the EGRB is likely to be important, and we find that it is. In addition, we show how upcoming GLAST observations of EGRET unidentified sources, as well as of their fainter counterparts, can be combined with GLAST observations of the Galactic and extragalactic diffuse backgrounds to shed light on the nature of the EGRET unidentified sources even without any positional association of such sources with low-energy counterparts.
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