Title:	Astrosat/laxpc reveals the high-energy variability of GRS 1915+105 in the χ class
Authors:	Yadav, J.S. Misra, Ranjeev Paul, Biswajit Ishwara-Chandra, C.H. +9 Co-authors
Keywords:	accretion black hole physics
Issue Date:	10-Dec-2016
Publisher:	IOP Sciences for The American Astronomical Society
Citation:	Astrophysical Journal, 2016, Vol. 833, p 27
Abstract:	We present the first quick look analysis of data from nine AstroSat's Large Area X-ray Proportional Counter (LAXPC) observations of GRS 1915+105 during 2016 March when the source had the characteristics of being in the Radio-quiet χ class. We find that a simple empirical model of a disk blackbody emission, with Comptonization and a broad Gaussian Iron line can fit the time-averaged 3–80 keV spectrum with a systematic uncertainty of 1.5% and a background flux uncertainty of 4%. A simple dead time corrected Poisson noise level spectrum matches well with the observed high-frequency power spectra till 50 kHz and as expected the data show no significant high-frequency ($\gt 20\,\mathrm{Hz}$) features. Energy dependent power spectra reveal a strong low-frequency (2–8 Hz) quasi-periodic oscillation and its harmonic along with broadband noise. The QPO frequency changes rapidly with flux (nearly 4 Hz in ~5 hr). With increasing QPO frequency, an excess noise component appears significantly in the high-energy regime ($\gt 8$ keV). At the QPO frequencies, the time-lag as a function of energy has a non-monotonic behavior such that the lags decrease with energy till about 15–20 keV and then increase for higher energies. These first-look results benchmark the performance of LAXPC at high energies and confirms that its data can be used for more sophisticated analysis such as flux or frequency-resolved spectro-timing studies.
Description:	Open Access
URI:	http://hdl.handle.net/2289/6681
ISSN:	0004-637X 1538-4357-(Online)
Alternative Location:	http://adsabs.harvard.edu/abs/2016ApJ...833...27Y http://arxiv.org/abs/1608.07023 http://dx.doi.org/10.3847/0004-637X/833/1/27
Copyright:	2016, The American Astronomical Society.
Appears in Collections:	Research Papers (A&A)

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