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Title:
On the Gas Surrounding High-Redshift Galaxy Clusters*
Authors:
Francis, Paul J.; Wilson, Greg M.; Woodgate, Bruce E.
Affiliation:
AA(Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT 0200, Australia, Joint appointment with the Department of Physics, Faculty of Science; ), AB(Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT 0200, Australia; ), AC(NASA Goddard Space Flight Center, Code 681, Greenbelt, MD 20771, USA; )
Publication:
Publications of the Astronomical Society of Australia, Volume 18, Issue 1, pp. 64-75. (PASA Homepage)
Publication Date:
00/2001
Origin:
PASA
DOI:
10.1071/AS01005
Bibliographic Code:
2001PASA...18...64F

Abstract

Francis & Hewett (1993) identified two 10 Mpc-scale regions of the high-redshift universe that were seemingly very overdense in neutral hydrogen. Subsequent observations showed that at least one of these gas-rich regions enveloped a cluster of galaxies at redshift 2.38. We present improved observations of the three background QSOs with sightlines passing within a few Mpc of this cluster of galaxies. All three QSOs show strong neutral hydrogen absorption at the cluster redshift, suggesting that this cluster (and perhaps all high-redshift clusters) may be surrounded by a ~5 Mpc-scale region containing ~1012 M of neutral gas. We show that if most high-redshift clusters are surrounded by such regions, the gas must be in the form of many small (<1 kpc), dense (>0.03 cm-3) clouds, each of mass <106 M . These clouds are themselves probably gathered into >20 kpc-sized clumps, which may be galaxy halos or protogalaxies. If this gas exists, it will be partially photoionised by the UV background. We predict the diffuse Lyα flux from this photoionisation, and place observational limits on its intensity.

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