A precise determination of angular momentum in the black hole candidate GRO J1655-40

Details A precise determination of angular momentum in the black hole candidate GRO J1655-40 A precise determination of angular momentum in the black hole candidate GRO J1655-40

2001-05-04

arxiv.org/abs/astro-ph/0105077v1

Astron.Astrophys.374:L19,2001

Astronomy and Astrophysics

Astrophysics

Scientific paper

10.1051/0004-6361:20010791

We note that the recently discovered 450 Hz frequency in the X-ray flux of the black hole candidate GRO J1655-40 is in a 3:2 ratio to the previously known 300 Hz frequency of quasi-periodic oscillations (QPO) in the same source. If the origin of high frequency QPOs in black hole systems is a resonance between orbital and epicyclic motion of accreting matter, as suggested previously, the angular momentum of the black hole can be accurately determined, given its mass. We find that the dimensionless angular momentum is in the range $0.2

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