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Dim Baryons in the Cosmic Web

Published online by Cambridge University Press:  01 June 2007

Chris D. Impey
Chris D. Impey*
Affiliation:
Department of Astronomy, University of Arizona, Tucson, AZ 85721, USA email: cimpey@as.arizona.edu
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Abstract

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The distribution of baryons beyond galaxies is descibed. The majority of the baryons, which represent 4% of the cosmic mass and energy budget, lie far from individual galaxies in the diffuse intergalactic medium (IGM). Many of these baryons are in a warm phase that can be probed by quasar absorption in the Lyman-α line of hydrogen. The mature field of quasar spectroscopy can diagnose the location, physical state, metallicity, and general geometry of this gas, which is called the “cosmic web.” The remainder of the gas is kept very hot by infall and shocks and is mostly in higher density regions such as filaments, groups and clusters. The hot gas is only detectable via X-rays and the absorption of highly ionized species of heavy elements. The baryons in low density regions of space are excellent tracers of underlying dark matter. The evolution of the cosmic web indicates where to look for the baryons in collapsed objects but the overall inefficiency of galaxy formation has conspired to keep most baryons dark.

Keywords

intergalactic mediumquasars: absorption linesdark matterlarge-scale structure of universecosmology: observationsX-rays: diffuse backgroundatomic processes
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S244: Dark Galaxies and Lost Baryons , June 2007 , pp. 157 - 166
Copyright
Copyright © International Astronomical Union 2008

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