Abstract
Most of the baryons in the present-day universe are thought to reside in intergalactic space at temperatures of 105-107 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 nongravitational energy injected into intergalactic space by supernovae and active galactic nuclei. 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.
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