|
Speaker |
Slany, Petr |
|
Co-autors |
Z. Stuchlik |
|
Talk Title |
Mass and spin estimates of two near-extreme Kerr black hole candidates GRS 1915+105 and XTE J1650-500 from the Extended Orbital Resonance Model for high-frequency QPOs |
|
Abstract |
Humpy profile of the LNRF-related orbital velocity was found for accretion discs orbiting rapidly rotating Kerr black holes with a spin a>0.9953. The positive rate of change of the orbital velocity in terms of the proper radial distance is used to define a local frequency in the disc. Comparing the "humpy frequency" with epicyclic frequencies of the orbital motion, it was shown that in Keplerian discs orbiting specific near-extreme Kerr black holes (a>0.998) the radial epicyclic frequency and the humpy frequency are in the ratio of small integers. The model was applied to two X-ray variable sources. In the case of GRS 1915+105, the model is able to address the whole set of reported QPOs, giving the mass and spin of the black hole: a=0.9998, M=14.8M_sun. For XTE J1650-500, similar ideas give values a=0.9982, M=5.1M _sun. |
|
Talk view |
|
|
|
|