Physics
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...727...29m&link_type=abstract
The Astrophysical Journal, Volume 727, Issue 1, article id. 29 (2011).
Physics
1
Binaries: Close, Black Hole Physics, Gamma-Ray Burst: General, Supernovae: General, X-Rays: Binaries
Scientific paper
Recent measurements of the Kerr parameters a sstarf for two black hole binaries in our Galaxy, GRO J1655-40 and 4U 1543-47, of a sstarf = 0.65-0.75 and a sstarf = 0.75-0.85, respectively, fit the predictions of Lee et al. of a sstarf cong 0.8. They predicted a sstarf>0.5 for 80% of the soft X-ray transient (SXT) sources. The maximum available energy in the Blandford-Znajek formalism for a sstarf>0.5 gives E>3 × 1053 erg, orders of magnitude larger than the energy needed for the gamma-ray burst (GRB) and hypernova explosion. We interpret the SXTs to be relics of GRBs and hypernovae. We find that most galactic SXTs were subluminous given that they could use only a small part of the available rotational energy.
Brown Gerald E.
Lee Chang-Hwan
Moreno Méndez Enrique
Walter Frederick M.
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