The Birthplaces of Gamma-Ray Bursts

Details The Birthplaces of Gamma-Ray Bursts The Birthplaces of Gamma-Ray Bursts

2007-03-14

arxiv.org/abs/astro-ph/0703373v1

Astronomy and Astrophysics

Astrophysics

17 pages, 9 figures, submitted to the Astrophysical Journal

Scientific paper

We use population synthesis to construct distributions of gamma-ray bursts (GRBs) for different proposed progenitor models. We use a description of star formation that takes into account the evolution of metallicity with redshift and galaxy mass, the evolution of galaxy mass with redshift, and the star formation rate with galaxy mass and redshift. We compare predicted distributions with redshift and metallicity to observations of GRB host galaxies and find that the the simple models cannot produce the observed distributions, but that current theoretical models can reproduce the observations within some constraints on the fraction of fallback black holes that produce GRBs.

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