Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2011-11-10
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
Submitted to ApJ Letters. 12 manuscript pages and 4 figures; spin results have been updated
Scientific paper
During its 2003 outburst, the black-hole X-ray transient H1743-322 produced two-sided radio and X-ray jets. Applying a simple and symmetric kinematic model to the trajectories of these jets, we determine the source distance, 8.5 \pm 0.8 kpc, and the inclination angle of the jets, 75 \pm 3 degrees. Using these values, we estimate the spin of the black hole by fitting its RXTE spectra, obtained during the 2003 outburst, to a standard relativistic accretion-disk model. For its spin, we find a*=0.2 \pm 0.3 (68% limits); -0.3 < a* < 0.7 at 90% confidence. We rule strongly against an extreme value of spin: a* < 0.92 at 99.7% confidence. H1743-322 is the third known microquasar (after A0620-00 and XTE J1550-564) that displays large-scale ballistic jets and has a moderate value of spin. Our result, which depends on an empirical distribution of black hole masses, takes into account all known sources of measurement error.
McClintock Jeffrey E.
Reid Mark J.
Steiner James F.
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