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Article overview
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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 | Abstract: | 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". | Source: | arXiv, 0901.3802 | Services: | Forum | Review | PDF | Favorites |
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