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

Belloni, T. et al.

Monthly notices of the Royal Astronomical Society. VOL 369; NUMBER 1, ; 2006, 305-310 -- Blackwell Publishing Ltd (pages 305-310) -- 2006

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  • Title:
    High-frequency quasi-periodic oscillations from GRS 1915+105 in its C state
  • Author: Belloni, T.;
    Soleri, P.;
    Casella, P.;
    Mendez, M.;
    Migliari, S.
  • Found In: Monthly notices of the Royal Astronomical Society. VOL 369; NUMBER 1, ; 2006, 305-310
  • Journal Title: Monthly notices of the Royal Astronomical Society.
  • Subjects: Astronomy; LCC: QB1; Dewey: 520
  • Publication Details: Blackwell Publishing Ltd
  • Language: English
  • Abstract: 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 , 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 (Q2) 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 show a stronger and steeper (G= 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.
  • Identifier: Journal ISSN: 0035-8711
  • Publication Date: 2006
  • Physical Description: Electronic
  • Shelfmark(s): 5943.000000
  • UIN: ETOCRN188077910

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