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The 2dF QSO Redshift Survey – VIII. Absorption systems in the 10k catalogue

Authors:	P.J. Outram R.J. Smith T. Shanks B.J. Boyle S.M. Croom N.S. Loaring L. Miller

Affiliation:	¹Department of Physics, University of Durham, South Road, Durham DH1 3LE;²Astrophysics Research Institute, Liverpool John Moores University, 12 Quays House, Egerton Wharf, Birkenhead CH41 1LD;³Research School of Astronomy &Astrophysics, Mount Stromlo Observatory, Institute of Advanced Studies, Australian National University, Private Bag, Weston Creek PO, ACT 2611, Australia;⁴Anglo-Australian Observatory, PO Box 296, Epping, NSW 2121, Australia;⁵Department of Physics, University of Oxford, Nuclear &Astrophysics Laboratory, Keble Road, Oxford OX1 3RH

Abstract:	We examine the highest signal-to-noise ratio spectra from the 2dF QSO Redshift Survey (2QZ) 10k release and identify over 100 new low-ionization heavy-element absorbers: damped Lyman α (DLA) candidates suitable for higher-resolution follow-up observations. These absorption systems map the spatial distribution of high- z metals in exactly the same volumes as the foreground 2QZ QSOs themselves sample and hence the 2QZ gives us the unique opportunity to compare directly the two tracers of large-scale structure. We examine the cross-correlation of the two populations to see how they are relatively clustered, and, by considering the colour of the QSOs, detect a small amount of dust in these metal systems.

Keywords:	surveys quasars: absorption lines cosmology: observations large-scale structure of Universe

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