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Correlation of low z Lyman-$\alpha$ absorbers with HI-selected galaxies

Published online by Cambridge University Press:  06 October 2005

Emma Ryan-Weber
Emma Ryan-Weber
Affiliation:
Institute of Astronomy, University of Cambridge, UK, email: eryan@ast.cam.ac.uk
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Abstract

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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 H I Parkes All Sky Survey (HIPASS) galaxy catalogue is cross-correlated with known low redshift, low column density ($N_{\rm HI}<10^{15}$ cm$^{-2}$) Lyman-$\alpha$ absorbers from the literature. The absorber-galaxy cross-correlation function shows that on scales from 1–10 h$^{-1}$ Mpc, absorbers are embedded in halos with masses similar to that of galaxy groups.