Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aipc..662..193r&link_type=abstract
GAMMA-RAY BURST AND AFTERGLOW ASTRONOMY 2001: A Workshop Celebrating the First Year of the HETE Mission. AIP Conference Proceed
Astronomy and Astrophysics
Astronomy
3
Gamma-Ray Sources, Gamma-Ray Bursts, Neutron Stars, Black Holes
Scientific paper
We report on ongoing investigations of the merger model for the central engine of gamma-ray bursts and show first results of a new set of simulations for neutron star black hole binaries. The masses of the neutron star and black hole are the same in all cases, but we change the numerical resolution and the gravitational potential of the black hole by using descriptions that follow [12] and [1]. Since our code is basically Newtonian, this procedure is supposed to mimic the general relativistic effects that are associated with the existence of an innermost stable orbit and the variation of this orbit and of the horizon radius with the spin and the growing mass of the accreting black hole. The neutron star, which initially is in orbit about the black hole, is tidally disrupted but in several cases the remnant manages to temporarily move to a more eccentric orbit. A second and final episode of mass transfer follows, producing the standard outcome of a high-density torus around the black hole. Our simulations still need to be analysed with respect to the neutrino-antineutrino annihilation luminosities, but we expect similar values as in the double neutron star models.
Janka H.-Th.
Ruffert Max
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