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28 March 2024
 
  » arxiv » 0901.3802

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X-Ray Absorption By WHIM in the Sculptor Wall
David A. Buote ; Luca Zappacosta ; Taotao Fang ; Philip J. Humphrey ; Fabio Gastaldello ; Gianpiero Tagliaferri ;
Date 24 Jan 2009
AbstractWe present XMM RGS and Chandra LETG observations of the blazar, H 2356-309, located behind the Sculptor Wall, a large-scale galaxy structure expected to harbor high-density Warm-Hot Intergalactic Medium (WHIM). Our simultaneous analysis of the RGS and LETG spectra yields a 3-sigma detection of the crucial redshifted O vii K-alpha line with a column density (>~ 10^{16} cm^{-2}) consistent with similar large-scale structures produced in cosmological simulations. This represents the first detection of non-local WHIM from X-ray absorption studies where XMM and Chandra data are analyzed simultaneously and the absorber redshift is already known, thus providing robust evidence for the expected repository of the "missing baryons".
Source arXiv, 0901.3802
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