Disc-corona interaction in the heartbeat state of GRS 1915+105

Abstract

Timing analysis provides information about the dynamics of matter accreting on to neutron stars and black holes, and hence is crucial for studying the physics of the accretion flow around these objects. It is difficult, however, to associate the different variability components with each of the spectral components of the accretion flow. We apply several new methods to two Rossi X-ray Timing Explorer observations of the black hole binary GRS 1915+105 during its heartbeat state to explore the origin of the X-ray variability and the interactions of the accretion-flow components. We offer a promising window into the disc--corona interaction through analysing the formation regions of the disc aperiodic variabilities with different time-scales via comparing the corresponding transition energies of the amplitude-ratio spectra. In a previous paper, we analysed the Fourier power density as a function of energy and frequency to study the origin of the aperiodic variability, and combined that analysis with the phase lag as a function of frequency to derive a picture of the disc--corona interaction in this source. We here, for the first time, investigate the phase lag as a function of energy and frequency, and display some interesting details of the disc--corona interaction. Besides, the results from the shape of amplitude-ratio spectrum and from several other aspects suggest that the quasi-periodic oscillation originates from the corona.

12 pages, 7 figures

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Cited by in corpus (6)

• Variability and phase lags of the type-C quasi-periodic oscillation of MAXI J1348-630 with NICER
• A hidden quasi-periodic oscillation in Cygnus X-1 revealed by NICER
• Time-resolved spectroscopy on the heartbeat state of GRS 1915+105 using AstroSat
• Discovery of a new flaring class in GRS 1915+105 using AstroSat
• Black-hole X-ray binary Swift J1727.8$-$1613 shows simultaneous Type-B and Type-C quasi-periodic oscillations across the hard-intermediate and soft-intermediate states
• NICER Spectral and Timing Analysis of 4U 1630$-$47 and its Heartbeat State