Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...456l..17l&link_type=abstract
Astrophysical Journal Letters v.456, p.L17
Astronomy and Astrophysics
Astronomy
29
Galaxies: Clusters: General, Galaxies: Evolution, Galaxies: Quasars: Absorption Lines
Scientific paper
We report the identification of a group or cluster of galaxies at redshift z ~ 0.26 toward the quasi-stellar object (QSO) 1545+2101 that produces a complex of corresponding Ly alpha absorption systems. This observation demonstrates that at least some groups or clusters of galaxies produce Ly alpha absorption systems and that at least some Ly alpha absorption systems arise in groups or clusters of galaxies. Furthermore, this observation suggests that previous measurements may have significantly underestimated the degree of clustering of Ly alpha absorption systems on velocity scales of several hundred kilometers per second.
Barcons Xavier
Lanzetta Kenneth M.
Webb John K.
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