Phase-Resolved Timing Analysis of GRS 1915+105 in Its ρ State

Abstract

We made a phase-resolved timing analysis of GRS 1915+105 in its ρ state and obtained detailed ρ cycle evolutions of the frequency, the amplitude and the coherence of low-frequency quasi-periodic oscillation (LFQPO). We combined our timing results with the spectral study by Neilsen et al. to perform an elaborate comparison analysis. Our analyses show that the LFQPO frequency does not scale with the inner disk radius, but it is related to the spectral index, indicating a possible correlation between the LFQPOs and the corona. The LFQPO amplitude spectrum and other results are naturally explained by tying the LFQPO to the corona. The similarities of the spectra of variability parameters between the LFQPO from ρ state and those from more steady states indicate that the LFQPOs of GRS 1915+105 in very different states seem to share the same origin.

21 pages, 4 figures, accepted for publication in ApJ

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Cited by in corpus (7)

• Disk-Wind Connection During the Heartbeats of GRS 1915+105
• A Statistical Study on the Low-Frequency QPO Amplitude Spectrum and Amplitude in GRS 1915+105
• Transitions and Origin of the Type-B Quasi-Periodic Oscillation in the Black Hole X-ray Binary MAXI~ J1348--630
• A timing view of the heartbeat state of GRS 1915+105
• Disc-corona interaction in the heartbeat state of GRS 1915+105
• The X-ray view of black-hole candidate Swift J1842.5-1124 during its 2008 outburst
• The NuSTAR View of a QPO Evolution of GRS 1915+105