Computer Science
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001adspr..28..343r&link_type=abstract
Advances in Space Research, Volume 28, Issue 2-3, p. 343-347.
Computer Science
1
Scientific paper
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.
Paul Biswajit
Rao Ravi A.
Vadawale Santosh V.
Yadav J. S.
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