期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 354, 期 2, 页码 581-590出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2004.08216.x
关键词
galaxies : evolution; galaxies : formation; large-scale structure of Universe; gamma rays : bursts
We use numerical simulations of large-scale structure formation to explore the cosmological properties of gamma-ray burst (GRB) host galaxies. Among the different subpopulations found in the simulations, we identify the host galaxies as the most efficient star-forming objects, i.e. galaxies with high specific star-formation rates. We find that the host candidates are low-mass, young galaxies with low to moderate star-formation rate. These properties are consistent with those observed in GRB hosts, most of which are subluminous, blue galaxies. Assuming that host candidates are galaxies with high star-formation rates would have given conclusions inconsistent with the observations. The specific star-formation rate, given a galaxy mass, is shown to increase as the redshift increases. The low mass of the putative hosts makes them difficult to detect with present-day telescopes and the probability density function of the specific star-formation rate is predicted to change depending on whether or not these galaxies are observed.
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