Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/99492
Title: High-frequency quasi-periodic oscillations from GRS 1915+105 in its C state
Author: Belloni, T.
Soleri, P.
Casella, P.
Méndez, M.
Migliari, Simone
Keywords: Observacions astronòmiques
Astronomia de raigs X
Oscil·lacions
Astronomical observations
X-ray astronomy
Oscillations
Issue Date: Jun-2006
Publisher: Royal Astronomical Society
Abstract: We report the results of a systematic timing analysis of RXTE observations of GRS 1915+105 when the source was in its variability class θ, characterized by alternating soft and hard states on a time-scale of a few hundred seconds. The aim was to examine the high-frequency part of the power spectrum in order to confirm the hectohertz quasi-periodic oscillations (QPO) previously reported from observations from mixed variability behaviours. During the hard intervals (corresponding to state C in the classification of Belloni et al.), we find a significant QPO at a frequency of ~170 Hz, although much broader (Q~2) than previously reported. No other significant peak is observed at frequencies >30 Hz. A time-resolved spectral analysis of selected observations shows that the hard intervals from class θ show a stronger and steeper (Γ = 2.8-3.0) power-law component than hard intervals from other classes. We discuss these results in the framework of hectohertz QPOs reported from GRS 1915+105 and other black hole binaries.
Note: Reproducció del document publicat a: http://dx.doi.org/10.1111/j.1365-2966.2006.10286.x
It is part of: Monthly Notices of the Royal Astronomical Society, 2006, vol. 369, num. 1, p. 305-310
Related resource: http://dx.doi.org/10.1111/j.1365-2966.2006.10286.x
URI: http://hdl.handle.net/2445/99492
ISSN: 0035-8711
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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