Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002bhap.conf..313l&link_type=abstract
BLACK HOLE ASTROPHYSICS 2002 . Proceedings of the Sixth APCTP Winter School . Held 9-12 January 2002 in Pohang, Korea. Edited by
Astronomy and Astrophysics
Astrophysics
Scientific paper
In this talk, we discuss that the soft X-ray transients with black hole primaries may have been the sources of long time scale gamma-ray bursts and hypernovae earlier in their evolution. For soft X-ray transients with evolved companions we are able to reconstruct the preexplosion periods and find that the black-hole mass increases with the orbital period of the binary. This correlation can be understood in terms of angular-momentum support in the helium star progenitor of the black hole, if the systems with shorter periods had more rapidly rotating primaries prior to their explosion: centrifugal support will then prevent more of its mass from collapsing into the black hole on a dynamical time. A natural consequence of the He star rotation is that black holes formed in the short period soft X-ray binaries acquire significant Kerr parameters. This makes them good sources of gamma ray bursts and hypernovae, and thus supports our suggestion for the origin of gammaray bursts in soft X-ray transients. The Blandford-Znajek mechanism is one of the strong candidates as a possible process of energy extraction from rotating black holes.
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