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Published 2002 | Published + Submitted
Book Section - Chapter Open

Statistical Properties of DLAs and Sub-DLAs


Quasar absorbers provide a powerful observational tool with which to probe both galaxies and the intergalactic medium up to high redshift. We present a study of the evolution of the column density distribution, f(N,z), and total neutral hydrogen mass in high-column density quasar absorbers using data from a recent high-redshift survey for damped Lyman-α (DLA) and Lyman limit system (LLS) absorbers. Whilst in the redshift range 2 to 3.5, ~90% of the neutral HI mass is in DLAs, we find that at z>3.5 this fraction drops to only 55% and that the remaining 'missing' mass fraction of the neutral gas lies in sub-DLAs with N(HI) 10^(19) - 2 x 10^20 cm^(-2).

Additional Information

© 2002 Astronomical Society of the Pacific. Provided by the NASA Astrophysics Data System. CP would like to thank the organising committee for putting together a very enjoyable meeting.

Attached Files

Published - 2002ASPC__253__501P.pdf

Submitted - 0107125.pdf


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