Environmental Dependence of the Nature of Gaseous Envelopes of Galaxies at z < 1

Noriaki Yahata, Kenneth M. Lanzetta, John K. Webb, Xavier Barcons

Published 1998-09-24Version 1

We present new statistical study on the origin of Lyman-alpha absorption systems that are detected in QSO fields. The primary objective is to investigate environmental dependence of the relationship between galaxies and Lyman-alpha absorption systems. We find that galaxies exhibit no environmental dependence in giving rise to Lyman-alpha absorbers in their halos. Conversely, Lyman-alpha absorbers do not exhibit preference as to the environment where they reside.