Title:	X-ray emission characteristics of GRS 1915+105 during the two spectral states
Authors:	Rao, A.R. Paul, Biswajit Yadav, J.S. Vadawale, S.V.
Issue Date:	Jan-2001
Publisher:	Elsevier B.V.
Citation:	Advances in Space Research, 2001, Vol. 28, p343-347
Abstract:	We have analyzed X-ray data obtained from the RXTE archives pertaining to the low-hard and high-soft spectral states of GRS 1915+105, to establish the spectral and temporal characteristics during these states. In the high-soft state, the X-ray spectrum is described by the standard model for Galactic black hole candidate sources consisting of a multicolor disk-blackbody and a power-law, whereas the Power Density Spectrum (PDS) is steep without any evidence of QPO. In the low-hard state, the PDS is flat and dominated by a QPO at 0.5-10 Hz. However the X-ray spectrum in the low-hard state requires a different model consisting of a multi-color disk-blackbody and a comptonization due to hot plasma. Also, in the presence of steady radio emission during such state, an additional power-law component is required to describe the spectrum. We attempt to resolve the X-ray light-curves of the individual spectral components and find that the QPO is present only in the Comptonized component.
Description:	Restricted Access
URI:	http://hdl.handle.net/2289/4933
ISSN:	0273-1177
Alternative Location:	http://adsabs.harvard.edu/abs/2001AdSpR..28..343R http://dx.doi.org/10.1016/S0273-1177(01)00431-8
Copyright:	2001 Elsevier B.V.
Appears in Collections:	Research Papers (A&A)

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