QPO Evolution in 2005 Outburst of the Galactic Nano Quasar GRO J1655-40

Details QPO Evolution in 2005 Outburst of the Galactic Nano Quasar GRO J1655-40 QPO Evolution in 2005 Outburst of the Galactic Nano Quasar GRO J1655-40

2009-03-09

arxiv.org/abs/0903.1328v1

AIP Conf.Proc.1053:171,2008

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

5 Pages, 2 Figures, Proceeding of the 2nd Kolkata Conference on "Observational Evidence for the Black Holes in the Universe",

Scientific paper

10.1063/1.3009477

GRO J1655-40 showed significant X-ray activity in the last week of February, 2005 and remained active for the next 260 days. The rising and the decline phases of this particular outburst show evidence for systematic movements of the Comptonizing region, assumed to be a CENBOL, which causes the Quasi-periodic Oscillations or QPOs. We present both the spectral and the timing results of the RXTE/PCA data taken from these two hard spectral states. Assuming that the QPOs originate from an oscillating shock CENBOL, we show how the shock slowly moves in through the accretion flow during the rising phase at a constant velocity and accelerate away outward during the later part of the decline phase. By fitting the observed frequencies with our solution, we extract time variation of various disk parameters such as the shock locations, velocity etc.

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