A&A 380, 520-525 (2001)
DOI: 10.1051/0004-6361:20011413

Reflection and noise in the low spectral state of GX 339-4

M. Revnivtsev^{1, 2}, M. Gilfanov^{1, 2} and E. Churazov<sup>1, 2

1</sup>  Space Research Institute, Russian Academy of Sciences, Profsoyuznaya 84/32, 117810 Moscow, Russia
²  Max-Planck-Institute für Astrophysik, Karl-Schwarzschild-Str. 1, 85740 Garching bei München, Germany

(Received 6 February 2001 / Accepted 4 October 2001 )

Abstract
We analyze RXTE/PCA observations of GX 339-4 in the low spectral state from 1996-1997 and show that the pattern of its spectral and temporal variability is nearly identical to that of Cyg X-1. In particular, a tight correlation exists between the QPO centroid frequency and the spectral parameters. An increase of the QPO centroid frequency is accompanied with an increase of the amplitude of the reflected component and a steepening the slope of the underlying power law. Fourier frequency resolved spectral analysis showed, that the variability of the reflected component at frequencies higher than ~1-10 Hz is suppressed in comparison with that of the primary emission.

Key words: accretion, accretion disks -- black hole physics -- stars: binaries: general -- stars: individual: GX 339-4 -- X-rays: general -- X-rays: stars

Offprint request: M. Revnivtsev, revnivtsev@hea.iki.rssi.ru

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