Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21743214g&link_type=abstract
American Astronomical Society, AAS Meeting #217, #432.14; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The Spin of the Black Hole in the Soft X-ray Transient A0620-00. A0620-00 is the prototype soft X-ray transient, which is an eruptive type of X-ray binary. We have recently determined accurate values for the black hole mass, orbital inclination angle, and distance. Building on these results, we measured the radius of the inner edge of the accretion disk around the black hole primary by fitting its thermal continuum spectrum to our version of the relativistic Novikov-Thorne thin-disk model. We thereby estimated the spin parameter of the BH: a/M = 0.12 ± 0.19, with a/M -0.59 at the 3σ level of confidence. This result takes into account all sources of observational and model-parameter uncertainties. Despite the low spin, the intensity and properties of the radio counterpart, both in outburst and quiescence, attest to the presence of a strong jet. If jets are driven by BH spin, then current models indicate that jet power should be a steeply increasing function of spin. Consequently, the low spin of A0620-00 suggests that its jet may be disk driven.
Bailyn Charles
Cantrell Andrew
Gou Lijun
McClintock Jeffrey
Narayan Ramesh
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