Correlation of Low z Lyman-alpha Absorbers with HI-selected Galaxies
Abstract
In this work, observational evidence for the connection between low column density Lyman-alpha absorbers and large-scale structure traced by gas-rich galaxies is investigated. The HI Parkes All Sky Survey (HIPASS) galaxy catalogue is cross-correlated with known low redshift, low column density Lyman-alpha absorbers from the literature. The absorber-galaxy cross-correlation function shows that on scales from 1 to 10 h^-1 Mpc, absorbers are imbedded in halos with masses similar to that of galaxy groups. This statistical evidence suggests that galaxy groups could be the dominant environment of low column density Lyman-alpha absorbers at z=0.
Keywords
Cite
@article{arxiv.astro-ph/0504499,
title = {Correlation of Low z Lyman-alpha Absorbers with HI-selected Galaxies},
author = {Emma V. Ryan-Weber},
journal= {arXiv preprint arXiv:astro-ph/0504499},
year = {2009}
}
Comments
3 pages, 1 figure, to appear in IAU 199 conf. proc.: "Probing Galaxies through Quasar Absorption Lines," eds. Williams, Shu, Menard