Hydrogen 21-Centimeter Emission from a Galaxy at Cosmological Distance

Details Hydrogen 21-Centimeter Emission from a Galaxy at Cosmological Distance Hydrogen 21-Centimeter Emission from a Galaxy at Cosmological Distance

2001-09-06

arxiv.org/abs/astro-ph/0109108v1

Science 293 (2001) 1800

Astronomy and Astrophysics

Astrophysics

7 pages, 2 figures. Science 2001 September 7; 293, 1800 (in reports). Also available from http://www.sciencemag.org/cgi/cont

Scientific paper

10.1126/science.1063034

We have detected the neutral atomic hydrogen (HI) emission line at a cosmologically significant distance (z=0.18) in the rich galaxy cluster Abell 2218 with the Westerbork Synthesis Radio Telescope. The HI emission originates in a spiral galaxy 2.0 megaparsecs from the cluster core. No other significant detections have been made in the cluster, suggesting that the mechanisms that remove neutral gas from cluster galaxies are efficient. We infer that fewer than three gas-rich galaxies were accreted by Abell 2218 over the past 10^9 years. This low accretion rate is qualitatively consistent with low-density cosmological models in which clusters are largely assembled at z>1.

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