1303.0085 (Shu-Ping Yan et al.)

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

Shu-Ping Yan, Na Wang, Guo-Qiang Ding, Jin-Lu Qu

We made a phase-resolved timing analysis of GRS 1915+105 in its {\rho} state and obtained detailed {\rho} cycle evolutions of frequency, amplitude and coherence of low-frequency quasi-periodic oscillation (LFQPO). We combined our timing results with the spectral study by Neilsen et al. (2011) to do 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 LFQPO 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 {\rho} 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.

View original: http://arxiv.org/abs/1303.0085