INTEGRAL Observations of SS433: Analysis of Precessional and Orbital X-ray Periodicities
A. M. Cherepashchuk, R. A. Sunyaev, E. V. Seifina, E. A. Antokhina, D. I. Kosenko, S. V. Molkov, N. I. Shakura, K. A. Postnov, A. N. Timokhin, I. E. Panchenko
Abstract
Hard X-ray INT observations of SS 433 carried out during 2003-2005 years with an analysis of precessional and orbital variability is presented. The width of X-ray eclipse in the 25-50 keV range at the precessional phase ψ=0.1 (accretion disk is open to observer) is higher than that in the Ginga 18.4-27.6 keV range. This fact suggests existance the presence of hot extended corona around the supercritical accretion disk. Spectrum of hard X-rays in the range 10-200 keV does not change with the precessional phase which also suggests that hard X-ray flux is generated in the hot extended corona around the accretion disk. The parameters of this hot corona are: kT=23-25 keV, τ= 1.8-2.8. Mass ratio estimated from the analysis of the ingress part of the eclipse light curve is in the range q=mx/mv=0.3-0.5.
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