Determining the spin of two stellar-mass black holes from disc reflection signatures

Details Determining the spin of two stellar-mass black holes from disc reflection signatures Determining the spin of two stellar-mass black holes from disc reflection signatures

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009mnras.395.1257r&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 395, Issue 3, pp. 1257-1264.

Physics

25

Accretion, Accretion Discs, Black Hole Physics, X-Rays: Individual: J1753.5-0127, J1655-40

Scientific paper

We present measurements of the dimensionless spin parameters and inner-disc inclination of two stellar-mass black holes. The spin parameter of SWIFT J1753.5-0127 and GRO J1655-40 is estimated by modelling the strong reflection signatures present in their XMM-Newton observations. Using a newly developed, self-consistent reflection model which includes the blackbody radiation of the disc as well as the effect of Comptonization, blurred with a relativistic line function, we infer the spin parameter of SWIFT J1753.5-0127 to be 0.76+0.11-0.15. The inclination of this system is estimated at 55°+2-7. For GROJ1655-40, we find that the disc is significantly misaligned to the orbital plane, with an innermost inclination of 30°+5-10. Allowing the inclination to be a free parameter, we find a lower limit for the spin of 0.90, this value increases to that of a maximal rotating black hole when the inclination is set to that of the orbital plane of J1655-40. Our technique is independent of the black hole mass and distance, uncertainties in which are among the main contributors to the spin uncertainty in previous works.

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