Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 440, Issue 3, Pages 2313-2321Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stu445
Keywords
galaxies: formation; quasars: absorption lines
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Funding
- Australian Research Council
- ERC [320596]
- National Science Foundation [PHYS-1066293]
- European Research Council (ERC) [320596] Funding Source: European Research Council (ERC)
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We discuss the recent Baryon Oscillation Spectroscopic Survey measurement of a rather high bias factor for the host galaxies/haloes of damped Lyman alpha absorbers (DLAs), in the context of our previous modelling of the physical properties of DLAs within the Lambda cold dark matter paradigm. Joint modelling of the column density distribution, the velocity width distribution of associated low-ionization metal absorption, and the bias parameter suggests that DLAs are hosted by galaxies with dark matter halo masses in the range 10.5 log M(v)13, with a rather sharp cutoff at the lower mass end, corresponding to virial velocities of similar to 90 km s(-1). The observed properties of DLAs appear to suggest very efficient (stellar) feedback in haloes with masses/virial velocities below the cutoff and a large retained baryon fraction (greater than or similar to 35 per cent) in haloes above the cutoff.
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