Published in
American Astronomical Society, Astrophysical Journal, 2(548), p. L123-L126, 2001
DOI: 10.1086/319102
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Confusion of Diffuse Objects in the X-ray Sky
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Abstract
Most of the baryons in the present-day universe are thought to reside in intergalactic space at temperatures of 10^5-10^7 K. X-ray emission from these baryons contributes a modest (~10%) fraction of the ~ 1 keV background whose prominence within the large-scale cosmic web depends on the amount of non-gravitational energy injected into intergalactic space by supernovae and AGNs. Here we show that the virialized regions of groups and clusters cover over a third of the sky, creating a source-confusion problem that may hinder X-ray searches for individual intercluster filaments and contaminate observations of distant groups. ; Comment: accepted to ApJ Letters, 7 pages, 3 figures