Collapsars, Gamma-Ray Bursts, and Supernovae

Details Collapsars, Gamma-Ray Bursts, and Supernovae Collapsars, Gamma-Ray Bursts, and Supernovae

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aps..apr.c7002w&link_type=abstract

American Physical Society, April Meeting, April 29-May 2, 2000 Long Beach, CA, abstract #C7.002

Physics

Scientific paper

A collapsar is a kind of jet engine that is turned on when a black hole experiences very rapid accretion from a disk due to either the incomplete or failed explosion of a massive presupernova star endowed with rotation. In the most extreme case, the supernova shock promptly fails, a black hole and accretion disk form, and a strong gamma-ray burst is produced, either by neutrino transport (for accretion rates greater than about 0.1 solar masses/sec) or magnetohydrodynamical (MHD) processes in the disk (for any accretion rate, but certainly dominant below 0.01 solar masses/sec). Depending upon the duration and energy of the jet, its beaming, the pressure inside the star, and its radius, one can get phenomena ranging from ordinary GRBS, long GRBs (100s of seconds and longer), faint-soft GRBs (like 980425), asymmetric, energetic supernovae, or simply a well-mixed supernova. All GRBs powered by collapsars produce supernovae as a byproduct. The GRBs from collapsars will also be the brightest lights visible from the first stars produced just after the ``dark ages" and may be visible to red shift 30 and more.

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