Fynbo 2008 Metallicity Distributions of Gamma-ray Burst, Damped Lyman-alpha, and Lyman-break Galaxies at z=3

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arXiv e-print (arXiv:0801.3273)

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Title:		Reconciling the Metallicity Distributions of Gamma-ray Burst, Damped Lyman-alpha, and Lyman-break Galaxies at z=3
Authors:		Fynbo, Johan P. U.; Prochaska, J. Xavier; Sommer-Larsen, Jesper; Dessauges-Zavadsky, Miroslava; Moller, Palle
Publication:		eprint arXiv:0801.3273
Publication Date:		01/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		19 pages, 6 figures. Submitted to ApJ. Comments very welcome
Bibliographic Code:		2008arXiv0801.3273F

Abstract

We test the hypothesis that the host galaxies of long-duration gamma-ray bursts (GRBs) as well as quasar-selected damped Lyman-alpha (DLA) systems are drawn from the population of UV-selected star-forming, high-z galaxies (generally referred to as Lyman-break galaxies). Specifically, we compare the metallicity distributions of the GRB and DLA populations to simple models where these galaxies are drawn randomly from the distribution of star-forming galaxies according to their star-formation rate and HI cross-section respectively. We find that it is possible to match both observational distributions assuming very simple and constrained relations between luminosity, metallicity and HI sizes. The simple model can be tested by observing the luminosity distribution of GRB host galaxies and by measuring the luminosity and impact parameters of DLA selected galaxies as a function of metallicity. Our results support the expectation that GRB and DLA samples, in contrast to magnitude limited surveys, provide an almost complete census of star-forming galaxies at z=3.

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