Uniformity of foreground Galactic neutral hydrogen over cooling flow clusters

被引：8

作者：

Barnes, DG ^{[1
]}

Nulsen, PEJ

机构：

[1] Univ Melbourne, Sch Phys, Parkville, Vic 3010, Australia

[2] Univ Wollongong, Wollongong, NSW 2522, Australia

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2003年 / 343卷 / 01期

关键词：

ISM : structure; galaxies : clusters : individual : A3581; galaxies : clusters : individual : A2597; galaxies : clusters : individual : Sersic 159-03; cooling flows; X-rays : galaxies : clusters;

D O I：

10.1046/j.1365-8711.2003.06676.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Radio maps at 21 cm of foreground neutral hydrogen over three cooling flow clusters of galaxies show that the foreground gas is uniform on scales from similar to1-10 arcmin. Five sigma limits on fluctuations in the foreground column density for Abell 3581, Sersic 159-03 and Abell 2597 are 6.2x10(19), <LF>7.8x10(19) and 4.3x10(19) cm(-2), or 14, 43 and 17 per cent of the mean foreground column density in the region of the system, respectively. Fluctuations in the column density of neutral gas in the Galaxy are unlikely to account for any excesses of photoelectric absorption in these or other cooling flow clusters. Fluctuations in the foreground neutral gas on arcmin scales are also unlikely to be the cause of excess extreme ultraviolet and soft X-ray emission from clusters.

引用

页码：315 / 321

页数：7

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