COMPARISON OF TIME/PHASE LAGS IN THE HARD STATE AND PLATEAU STATE OF GRS 1915+105
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Pahari-2013-Comparison of time_p.pdf
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Author(s)
Pahari, Mayukh
Yadav, J. S.
Misra, Ranjeev
Uttley, Phil
Neilsen, Joseph M. G.
Date Issued
November 2013
Journal
The Astrophysical Journal
Publisher
IOP Publishing
Citation
Pahari, Mayukh, Joseph Neilsen, J. S. Yadav, Ranjeev Misra, and Phil Uttley. “COMPARISON OF TIME/PHASE LAGS IN THE HARD STATE AND PLATEAU STATE OF GRS 1915+105.” The Astrophysical Journal 778, no. 2 (November 12, 2013): 136. © 2013 The American Astronomical Society
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Final published version
Abstract
We investigate the complex behavior of energy- and frequency-dependent time/phase lags in the plateau state and the radio-quiet hard (χ) state of GRS 1915+105. In our timing analysis, we find that when the source is faint in the radio, quasi-periodic oscillations (QPOs) are observed above 2 Hz and typically exhibit soft lags (soft photons lag hard photons), whereas QPOs in the radio-bright plateau state are found below 2.2 Hz and consistently show hard lags. The phase lag at the QPO frequency is strongly anti-correlated with that frequency, changing sign at 2.2 Hz. However, the phase lag at the frequency of the first harmonic is positive and nearly independent of that frequency at ~0.172 rad, regardless of the radio emission. The lag energy dependence at the first harmonic is also independent of radio flux. However, the lags at the QPO frequency are negative at all energies during the radio-quiet state, but lags at the QPO frequency during the plateau state are positive at all energies and show a "reflection-type" evolution of the lag energy spectra with respect to the radio-quiet state. The lag energy dependence is roughly logarithmic, but there is some evidence for a break around 4-6 keV. Finally, the Fourier-frequency-dependent phase lag spectra are fairly flat during the plateau state, but increase from negative to positive during the radio-quiet state. We discuss the implications of our results in light of some generic models.
MIT Department
MIT Kavli Institute for Astrophysics and Space Research
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DOI of Published Version
https://doi.org/10.1088/0004-637X/778/2/136
