X-RAY ABSORPTION BY WHIM IN THE SCULPTOR WALL
- 7 April 2009
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 695 (2), 1351-1356
- https://doi.org/10.1088/0004-637x/695/2/1351
Abstract
We present XMM Reflection Grating Spectrometer (RGS) and Chandra Low-Energy Transmission Grating (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 3σ detection of the crucial redshifted O VII Kα line with a column density (1016 cm–2) consistent with similar large-scale structures produced in cosmological simulations. This represents the first detection of nonlocal 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."Keywords
This publication has 22 references indexed in Scilit:
- χ2AND POISSONIAN DATA: BIASES EVEN IN THE HIGH-COUNT REGIME AND HOW TO AVOID THEMThe Astrophysical Journal, 2009
- Where Are the Baryons? III. Nonequilibrium Effects and ObservablesThe Astrophysical Journal, 2006
- Probing Warm-Hot Intergalactic Medium Associated with the Virgo Cluster Using an Oxygen Absorption LinePublications of the Astronomical Society of Japan, 2004
- [ITAL]Chandra[/ITAL] Detection of Local O [CSC]vii[/CSC] H[CLC]e[/CLC]α Absorption along the Sight Line toward 3C 273The Astrophysical Journal, 2003
- Baryons in the Warm‐Hot Intergalactic MediumThe Astrophysical Journal, 2001
- Where Are the Baryons?The Astrophysical Journal, 1999
- The Cosmic Baryon BudgetThe Astrophysical Journal, 1998
- A complete southern sky redshift surveyThe Astrophysical Journal, 1994
- H I in the GalaxyAnnual Review of Astronomy and Astrophysics, 1990
- Parameter estimation in astronomy through application of the likelihood ratioThe Astrophysical Journal, 1979