GRB progenitors at low metallicities

Details GRB progenitors at low metallicities GRB progenitors at low metallicities

2006-10-10

arxiv.org/abs/astro-ph/0610276v1

Nuovo Cim.B121:1183-1187,2006

Astronomy and Astrophysics

Astrophysics

5 pages, 1 figure, to appear in the proceedings of "Swift and GRBs: Unveiling the Relativistic Universe", San Servolo, Venice,

Scientific paper

10.1393/ncb/i2007-10237-6

We calculated pre-supernova evolution models of single rotating massive stars. These models reproduce observations during the early stages of the evolution very well, in particular Wolf--Rayet (WR) populations and ratio between type II and type Ib,c supernovae at different metallicities (Z). Using these models we found the following results concerning long and soft gamma--ray burst (GRB) progenitors: - GRBs coming from WO--type (SNIc) WR stars are only produced at low Z (LMC or lower). - The upper metallicity limit for GRBs is reduced to Z ~ 0.004 (SMC) when the effects of magnetic fields are included. - GRBs are predicted from the second (and probably the first) stellar generation onwards.

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