2001/09/06 by Martin Zwaan, M. A. Zwaan, Pieter van Dokkum +1 · 1 citation
Physics and Astronomy · #Astronomy #Astrophysics #Astrophysics and Cosmic Phenomena #Astrophysics and Star Formation Studies #Centimeter #Galaxies: Formation, Evolution, Phenomena #Galaxy #Physics #astro-ph
paper · pdf · doi:10.1126/science.1063034
published as Science 293 (2001) 1800 · 7 pages, 2 figures. Science 2001 September 7; 293, 1800 (in reports). Also available from http://www.sciencemag.org/cgi/content/abstract/293/5536/1800
arxiv created 2001/09/06 · openalex publication_date 2001/09/07 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 h65(-1) 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.