On the harmonics of the low-frequency quasi-periodic oscillation in GRS 1915+105
arXiv:1203.3582 · doi:10.1111/j.1365-2966.2012.20906.x
Abstract
GRS 1915+105 is a widely studied black hole binary, well known because of its extremely fast and complex variability. Flaring periods of high variability alternate with "stable" phases (the plateaux) when the flux is low, the spectra are hard and the timing properties of the source are similar to those of a number of black hole candidates in hard spectral state. In the plateaux the power density spectra are dominated by a low frequency quasi periodic oscillation (LFQPO) superposed onto a band limited noise continuum and accompanied by at least one harmonic. In this paper we focus on three plateaux, presenting the analysis of the power density spectra and in particular of the LFQPO and its harmonics. While plotting the LFQPO and all the harmonics together on a frequency-width plane, we found the presence of a positive trend of broadening when the frequency increases. This trend can shed light in the nature of the harmonic content of the LFQPO and challenges the usual interpretation of these timing features.
10 pages, 8 figures. Accepted for publication in MNRAS
References in corpus (2)
Cited by in corpus (7)
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- Fast infrared variability from the black-hole candidate MAXI J1535571 and tight constraints on the modelling
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- Timing analysis of the black-hole candidate Swift J1727.8-1613: detection of a dip-like feature in the high-energy cross spectrum
- On the modulation of low frequency Quasi-Periodic Oscillations in black-hole transients