Constraining the thermal history of the Warm-Hot Intergalactic Medium

Details Constraining the thermal history of the Warm-Hot Intergalactic Medium Constraining the thermal history of the Warm-Hot Intergalactic Medium

2005-01-19

arxiv.org/abs/astro-ph/0501402v1

Astronomy and Astrophysics

Astrophysics

10 pages, 5 figures, 1 appendix. A&A accepted

Scientific paper

10.1051/0004-6361:20040371

We have identified a large-scale structure traced by galaxies at z=0.8, within the Lockman Hole, by means of multi-object spectroscopic observations. By using deep XMM images we have investigated the soft X-ray emission from the Warm-Hot Intergalactic Medium (WHIM) expected to be associated with this large-scale structure and we set a tight upper limit to its flux in the very soft 0.2-0.4 keV band. The non-detection requires the WHIM at these redshifts to be cooler than 0.1 keV. Combined with the WHIM emission detections at lower redshift, our result indicates that the WHIM temperature is rapidly decreasing with redshift, as expected in popular cosmological models.

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