Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-04-19
Astronomy and Astrophysics
Astrophysics
16 pages, 3 figures. Accepted for publication in ApJ
Scientific paper
10.1086/307719
We present new GHRS observations of Lyman alpha absorption lines associated with a group of galaxies towards the QSO 1545+2101. We have identified eight distinct Lyman alpha absorption features in the spectrum of QSO 1545+2101 at a mean redshift of z=0.2648 with a velocity dispersion of 163 km/s. A group of galaxies is detected in the vicinity of this QSO at a mean redshift of z=0.2645 and velocity dispersion 239 km/s. The identification of discrete absorption systems indicates that they arise in clouds of neutral hydrogen rather than in a diffuse intragroup medium. Our analysis suggests that the Lyman alpha absorption lines are associated with individual galaxies in the group, although a one-to-one relationship between absorbers and galaxies is difficult to establish in such a dense environment.
Barcons Xavier
Fernandez-Soto Alberto
Lanzetta Kenneth M.
Ortiz-Gil Amelia
Webb John K.
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