Confusion of Diffuse Objects in the X-ray Sky

Details Confusion of Diffuse Objects in the X-ray Sky Confusion of Diffuse Objects in the X-ray Sky

2000-12-08

arxiv.org/abs/astro-ph/0012191v1

Astronomy and Astrophysics

Astrophysics

accepted to ApJ Letters, 7 pages, 3 figures

Scientific paper

10.1086/319102

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.

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