XMM-Newton detection of warm/hot integalactic medium at z~0.01

We report a ~3 sigma detection of a 21.82 A absorption feature in the direction of the BL Lac MRK 421 which is interpreted as OVII K(alpha) at z~0.01. This corresponds to the redshift of a H absorber in a cosmic void detected by HST along the line of sight of the same object. The 21.82 A line proves...

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Bibliographic Details
Published in:arXiv.org 2004-05
Main Author: Cagnoni, Ilaria
Format: Article
Language:English
Subjects:
Absorption
Astronomical models
Intergalactic media
Local group (astronomy)
Red shift
Universe
XMM (spacecraft)
Online Access:Get full text
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Summary:We report a ~3 sigma detection of a 21.82 A absorption feature in the direction of the BL Lac MRK 421 which is interpreted as OVII K(alpha) at z~0.01. This corresponds to the redshift of a H absorber in a cosmic void detected by HST along the line of sight of the same object. The 21.82 A line proves the existence of warm/hot intergalactic medium (WHIM) outside the Local Group, in agreement with current models of structure formation in the Universe. The WHIM at z~0.01 has temperature
ISSN:2331-8422