SIMBAD references

2006MNRAS.369..305B - Mon. Not. R. Astron. Soc., 369, 305-310 (2006/June-2)

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

BELLONI T., SOLERI P., CASELLA P., MENDEZ M. and MIGLIARI S.

Abstract (from CDS):

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.

Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS

Journal keyword(s): accretion, accretion discs - X-rays: binaries

Simbad objects: 8

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2021.03.05-00:01:32

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