Detections of Warm-Hot Intergalactic Medium

Details Detections of Warm-Hot Intergalactic Medium Detections of Warm-Hot Intergalactic Medium

2004-01-12

arxiv.org/abs/astro-ph/0401202v1

Astronomy and Astrophysics

Astrophysics

6 pages, 4 figures, to be published in proceedings of the workshop "Modelling the Intergalactic and Intracluster Media", Vulca

Scientific paper

Several popular cosmological models predict that most of the baryonic mass in the local universe is located in filamentary and sheet-like structures associated with groups and clusters of galaxies. This gas is expected to be gravitationally heated to ~10^6 K and therefore emitting in the soft X-rays. We have investigated three fields with large scale structures of galaxies at redshifts 0.1, 0.45, 0.79 and found signatures of warm-hot thermal emission (kT< 1 keV) correlated with the distribution of galaxies for the first two. The correlation and the properties of both X-ray and galaxy distribution strongly suggest that the diffuse X-ray flux is due to extragalactic emission by the Warm-Hot Intergalactic Medium (WHIM) predicted by cosmological models.

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