Uniformity of foreground Galactic neutral Hydrogen over cooling flow clusters

Abstract

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 about 1 -- 10 arcmin. Five sigma limits on fluctuations in the foreground column density for Abell 3581, Sersic 159-03 and Abell 2597 are 6.2e19, 7.8e19 and 4.3e19 per sq cm, 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 arcminute scales are also unlikely to be the cause of excess EUV and soft X-ray emission from clusters.

17 pages, 5 figures, MNRAS accepted 2 April 2003

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Cited by in corpus (5)

• Thermal conduction and reduced cooling flows in galaxy clusters
• New XMM-Newton observation of the Phoenix cluster: properties of the cool core
• Infrared Emission from the Nearby Cool Core Cluster Abell 2597
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• Peering Through the Muck: Notes on the Influence of the Galactic Interstellar Medium on Extragalactic Observations