Publication date: Jun 2013
Abstract:
The multi-resonance orbital model of high-frequency quasi-periodic
oscillations (HF QPOs) enables precise determination of the black hole
dimensionless spin a if observed set of oscillations demonstrates three
(or more) commensurable frequencies. The black hole spin a is related to
the frequency ratio only, while its mass M is related to the frequency
magnitude. The model is applied to the triple frequency set of HF QPOs
observed in Sgr A* source with frequency ratio 3:2:1. Acceptable
versions of the multi-resonance model are determined by the restrictions
on the Sgr A* supermassive black hole mass. The version of strong
resonances related to the black hole „magic“ spin a=0.983 is acceptable
but the version demonstrating the best agreement with the mass
restrictions predicts spin a=0.980.
Authors:
Kotrlová, A.; Stuchlík, Z.; Török, G.;