Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-08-27
Astronomy and Astrophysics
Astrophysics
12 pages, 6 figures, PASJ 58 (in press)
Scientific paper
We have proposed in previous papers that the high-frequency pair QPOs observed in black-hole binaries with frequency ratio 3:2 are inertial-acoustic oscillations (nearly horizontal oscillations with no node in the vertical direction) or g-mode oscillations, which are resonantly excited on warped relativistic disks. The resonance occurs through horizontal motions. In this model the dimensionless spin parameter $a_*$ of the central sources can be estimated when their masses are known from other observations. This estimate is done for three sources (GRO J1665-40, XTE J1550-564, GRS 1915+105). For all of them we have $a_*\leq 0.45$.
Fukue Jun
Kato Shoji
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