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Energy spectra of X-ray quasi-periodic oscillations in accreting black hole binaries

Published online by Cambridge University Press:  01 August 2006

P. T. Życki ,
M. A. Sobolewska  and
A. Niedźwiecki
P. T. Życki
Affiliation:
Nicolaus Copernicus Astronomical Center, Bartycka 18, 00-716 Warsaw, Poland email: [email protected]
M. A. Sobolewska
Affiliation:
Department of Physics, University of Durham, South Road, Durham DH1 3LE, UK
A. Niedźwiecki
Affiliation:
Łódź University, Department of Physics, Pomorska 149/153, 90-236 Łódź, Poland
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Abstract

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We investigate the energy dependencies of X-ray quasi-periodic oscillations in black hole X-ray binaries. We analyze RXTE data on both the low- and high-frequency QPO. We construct the low-f QPO energy spectra, and demonstrate that they do not contain the thermal disk component, even though the latter is present in the time averaged spectra. The disk thus does not seem to participate in the oscillations. Moreover the QPO spectra are harder than the time averaged spectra when the latter are soft, which can be modeled as a result of modulations occurring in the hot plasma. The QPO spectra are softer than the time averaged spectra when the latter are hard. The absence of the disk component in the QPO spectra is true also for the high-frequency (hecto-Hz) QPO observed in black hole binaries. We compute the QPO spectra expected from the model of disk resonances.

Keywords

Accretionaccretion disks – relativity – X-rays: binaries
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S238: Black Holes from Stars to Galaxies – Across the Range of Masses , August 2006 , pp. 13 - 18
Copyright
Copyright © International Astronomical Union 2007

References

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