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X-Ray Absorption By WHIM in the Sculptor Wall

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arxiv 0901.3802 v1 pith:J7JMKQ4G submitted 2009-01-24 astro-ph.CO

David A. Buote (1) , Luca Zappacosta (1 , 2) , Taotao Fang (1) , Philip J. Humphrey (1) , Fabio Gastaldello (1 , 3) , Gianpiero Tagliaferri (4) ((1) UC Irvine
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We 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".

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  1. An X-ray Absorption-Line Survey of the Circumgalactic Medium of M31 with XMM-Newton

    astro-ph.GA 2026-08 conditional novelty 6.0 of 10

    The first multi-sightline X-ray absorption survey toward M31 reports a 2.2-2.3 sigma excess in O VII and O VIII equivalent widths inside 300-350 kpc, consistent with a hot circumgalactic medium.

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