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Spectral and Fourier analyses of X-ray quasi-periodic oscillations in accreting black holes.

Sobolewska, M. A. and Zycki, P. T. (2006) 'Spectral and Fourier analyses of X-ray quasi-periodic oscillations in accreting black holes.', Monthly notices of the Royal Astronomical Society., 370 (1). pp. 405-414.

Abstract

We study energy dependencies of quasi-periodic oscillations (QPOs) from a number of black hole X-ray binaries. The selected sources were observed by RXTE at time periods close to state transitions and showed QPOs in the 1–10 Hz range. We have constructed QPO rms energy spectra, which provide information about underlying physical process leading to QPO generation. These spectra show an interesting anticorrelation with the time-averaged spectra. The QPO rms spectra are harder than the time-averaged spectra when the latter are soft, while they are softer than the time-averaged spectra when the latter are hard. We then discuss these observational results in the context of simple spectral variability models. Hard QPO spectra can be produced by quasi-periodic modulations of the heating rate of the Comptonizing plasma, while soft QPO spectra result from modulations of the cooling rate by soft photons.

Item Type:Article
Keywords:Accretion discs, Instabilities, Radiation thermal mechanisms, X-rays.
Full text:PDF - Other (363Kb)
Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1111/j.1365-2966.2006.10489.x
Publisher statement:The definitive version is available at www.blackwell-synergy.com
Record Created:02 May 2008
Last Modified:11 Aug 2011 15:05

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