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Reconciling the Metallicity Distributions of Gamma-ray Burst, Damped Lyman-α, and Lyman-break Galaxies at z ≈ 3

Published online by Cambridge University Press:  01 June 2008

Johan P. U. Fynbo ,
J. Xavier Prochaska ,
Jesper Sommer-Larsen ,
Miroslava Dessauges-Zavadsky  and
Palle Møller
Johan P. U. Fynbo
Affiliation:
Dark Cosmology Centre, Niels Bohr Institute, Copenhagen University, Juliane Maries Vej 30, 2100 Copenhagen O, Denmark email: [email protected]
J. Xavier Prochaska
Affiliation:
Department of Astronomy and Astrophysics, UCO/Lick Observatory, University of California, 1156 High Street, Santa Cruz, CA 95064, US
Jesper Sommer-Larsen
Affiliation:
Excellence Cluster Universe, Technische Universität München; Boltz-manstr. 2, D-85748 Garching, Germany
Miroslava Dessauges-Zavadsky
Affiliation:
Observatoire de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
Palle Møller
Affiliation:
European Southern Observatory, Karl-Scharschild-strasse 2, D-85748 Garching bei München, Germany
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Abstract

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We test the hypothesis that the host galaxies of long-duration gamma-ray bursts (GRBs) as well as quasar-selected damped Lyman-α (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 against simple disk 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, metallicity gradients 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 with magnitude limited surveys, provide an almost complete census of star-forming galaxies at z ≈ 3.

Keywords

gamma-rays: bursts – interstellar medium
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Issue S254: The Galaxy Disk in Cosmological Context , June 2008 , pp. 41 - 48
Copyright
Copyright © International Astronomical Union 2009

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