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High-frequency quasi-periodic oscillations from GRS 1915+105 in its C state

By T. Belloni, P. Soleri, P. Casella, M. Méndez and Simone Migliari

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

Topics: Observacions astronòmiques, Astronomia de raigs X, Oscil·lacions, Astronomical observations, X-ray astronomy, Oscillations
Publisher: Royal Astronomical Society
Year: 2016
DOI identifier: 10.1111/j.1365-2966.2006.10286.x
OAI identifier: oai:diposit.ub.edu:2445/99492
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