SIMBAD references

1999ApJ...523...72O - Astrophys. J., 523, 72-77 (1999/September-3)

The gaseous extent of galaxies and the origin of Lyα absorption systems. IV. Lyα absorbers arising in a galaxy group.


Abstract (from CDS):

We present new Goddard High Resolution Spectrograph observations of Lyα absorption lines associated with a group of galaxies toward the QSO 1545+2101. We have identified eight distinct Lyα 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–1. A group of galaxies is detected in the vicinity of this QSO at a mean redshift of z=0.2645 and velocity dispersion of 239 km.s–1. 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 Lyα 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.

Abstract Copyright:

Journal keyword(s): Galaxies: ISM - Galaxies: Quasars: Absorption Lines - quasars: individual (1545+2101)

Nomenclature: Table 2: [OLW99] N (Nos 0-8).

CDS comments: Galaxies numbers on Fig.2 doesn't correspond to the data in table 2 and three galaxies are wrongly identified. In SIMBAD, data are from table 2.

Simbad objects: 9

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