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High‐Frequency Quasi‐periodic Oscillations in the Black Hole X‐Ray Transient XTE J1650−500

J. HomanINAF-Osservatorio Astronomico di Brera, Via E. Bianchi 46, 23807 Merate (LC)M. Klein‐WoltAstronomical Institute Anton Pannekoek, University of Amsterdam, and Center for High Energy Astrophysics, Kruislaan 403, 1098 SJ, Amsterdam, NetherlandsSabrina RossiINAF-Osservatorio Astronomico di Brera, Via E. Bianchi 46, 23807 Merate (LC)J. M. MïllerHarvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138R. WijnandsSchool of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews Fife, KY16 9SS, Scotland, UKT. BelloniINAF-Osservatorio Astronomico di Brera, Via E. Bianchi 46, 23807 Merate (LC)M. van der KlisAstronomical Institute Anton Pannekoek, University of Amsterdam, and Center for High Energy Astrophysics, Kruislaan 403, 1098 SJ, Amsterdam, NetherlandsW. H. G. LewinCenter for Space Research and Department of Physics, Massachusetts Insitute of Technology, Cambridge, MA 02139-4307

2003en

ABI

Annotatsiya

We report the detection of high frequency variability in the black hole X-ray transient XTE J1650-500. A quasi-periodic oscillation (QPO) was found at 250 Hz during a transition from the hard to the soft state. We also detected less coherent variability around 50 Hz, that disappeared when the 250 Hz QPO showed up. There are indications that when the energy spectrum hardened the QPO frequency increased from ~110 Hz to ~270 Hz, although the observed frequencies are also consistent with being 1:2:3 harmonics of each other. Interpreting the 250 Hz as the orbital frequency at the innermost stable orbit around a Schwarzschild black hole leads to a mass estimate of 8.2 Msun. The spectral results by Miller et al.(2002, ApJ, 570, L69), which suggest considerable black hole spin, would imply a higher mass.

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DOI: 10.1086/367699

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