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Hydrogen 21-Centimeter Emission from a Galaxy at Cosmological Distance

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Science  07 Sep 2001:
Vol. 293, Issue 5536, pp. 1800-1802
DOI: 10.1126/science.1063034

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Abstract

We have detected the neutral atomic hydrogen (HI) emission line at a cosmologically significant distance [redshift (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 h 65 −1megaparsecs 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 109 years. This low accretion rate is qualitatively consistent with low-density cosmological models in which clusters are largely assembled at z > 1.

  • * To whom correspondence should be addressed. E-mail: mzwaan{at}physics.unimelb.edu.au

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