X-Ray Absorption By WHIM in the Sculptor Wall

Details X-Ray Absorption By WHIM in the Sculptor Wall X-Ray Absorption By WHIM in the Sculptor Wall

2009-01-24

arxiv.org/abs/0901.3802v1

Astrophys.J.695:1351-1356,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Accepted for Publication in The Astrophysical Journal, 7 pages, 2 figures

Scientific paper

10.1088/0004-637X/695/2/1351

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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