Single star progenitors of long gamma-ray bursts.I. Model grids and redshift dependent GRB rate

S.C. Yoon, N. Langer, C. Norman

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

We present grids of massive star evolution models at four different metallicities (Z = 0.004, 0.002, 0.001, 0.00001). The effects of rotation on the stellar structure and the transport of angular momentum and chemical elements through the Spruit-Tayler dynamo and rotationally induced instabilities are considered. After discussing uncertainties involved with the adopted physics, we elaborate the final fate of massive stars as a function of initial mass and spin rate, at each considered metallicity. In particular, we investigate for which initial conditions long gamma-ray bursts (GRBs) are expected to be produced in the frame of the collapsar model. Then, using an empirical spin distribution of young massive metal-poor stars and a specified metallicity-dependent history of star-formation, we compute the expected GRB rate as function of metallicity and redshift based on our stellar evolution models. The GRB production in our models is limited to metallicities of Z
Original languageUndefined/Unknown
Pages (from-to)199-208
Number of pages10
JournalAstronomy and Astrophysics
Volume460
Issue number1
Publication statusPublished - 2006

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