Mass estimate of the XTE J1650-500 black hole from the Extended Orbital Resonance Model for high-frequency QPOs - AstrophysicsReport as inadecuate




Mass estimate of the XTE J1650-500 black hole from the Extended Orbital Resonance Model for high-frequency QPOs - Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: XTE J1650-500 is a Galactic black-hole binary system for which at least onehigh-frequency QPO at 250Hz was reported. Moreover there are indications thatthe system harbours a near-extreme Kerr black-hole with the spin near 0.998 andmass M<7.3M sun. Recently it was discovered that the orbital 3-velocity ofKeplerian geodesical discs orbiting Kerr black holes with the spin a>0.9953,being analyzed in the locally non-rotating frames, reveals a hump near themarginally stable orbit. Further it was suggested that the hump could excitethe epicyclic motion of particles near the ISCO with frequencies typical forhigh-frequency QPOs. Characteristic frequency of the hump-induced oscillationswas defined as the maximal positive rate of change of the LNRF-related orbitalvelocity with the proper radial distance. If the characteristic -humpyfrequency- and the radial epicyclic frequency are commensurable, strongresonant phenomena are expected. For the Kerr black hole with the spin a=0.9982the -humpy frequency- and the radial epicyclic frequency are in ratio 1:3.Identifying the radial epicyclic frequency with the observed 250Hz QPO, we getthe mass of the black hole in XTE J1650-500 near 5.1M sun.



Author: Petr Slany, Zdenek Stuchlik

Source: https://arxiv.org/



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