Constraining the thermal history of the warm-hot intergalactic medium

被引：8

作者：

Zappacosta, L

Maiolino, R

Finoguenov, A

Mannucci, F

Gilli, R

Ferrara, A

机构：

[1] Univ Florence, Dipartimento Astron & Sci Spazio, I-50125 Florence, Italy

[2] Osserv Astrofis Arcetri, I-50125 Florence, Italy

[3] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany

[4] CNR, Ist Radioastron, Sez Firenze, I-50125 Florence, Italy

[5] SISSA, Sch Adv Int Studies, I-34014 Trieste, Italy

来源：

ASTRONOMY & ASTROPHYSICS | 2005年 / 434卷 / 03期

关键词：

cosmology : large-scale structure of Universe; X-rays : diffuse background; galaxies : intergalactic medium; galaxies : distances and redshifts;

D O I：

10.1051/0004-6361:20040371

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 rapidly decreases with redshift, as expected in popular cosmological models.

引用

页码：801 / 809

页数：9

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