What is the optimum stellar rotation rate for a collapsar?

Details What is the optimum stellar rotation rate for a collapsar? What is the optimum stellar rotation rate for a collapsar?

2007-03-01

arxiv.org/abs/astro-ph/0703032v1

Nuovo Cim.B121:1157-1161,2006

Astronomy and Astrophysics

Astrophysics

To appear in the proceedings of the conference "SWIFT and GRBs: Unveiling the relativistic universe", Il Nuovo Cimento"

Scientific paper

10.1393/ncb/i2007-10076-5

We consider low angular momentum, neutrino cooled accretion flows onto newborn black holes in the context of the collapsar model for long Gamma Ray Bursts, and find a considerable energy release for rotation rates lower than those usually considered. The efficiency for the transformation of gravitational binding energy into radiation is maximized when the equatorial angular momentum l0 ~ 2 Rg c, where Rg is the Schwarzschild radius.

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