Peculiar nature of hard X-ray eclipse in SS433 from INTEGRAL observations

Abstract

The analysis of INTEGRAL observations (2003-2008) of superaccreting galactic microquasar SS433 at precessional phases with the maximum disk opening angle is carried out. The shape and width of the primary X-ray eclipse is found to be strongly variable suggesting additional absorption in dense stellar wind and gas outflows from the optical A7I-component. The joint modeling of X-ray eclipse and precessional X-ray variability by a geometrical model suggests the binary mass ratio q=m_x/m_v=0.3, allowing an explnation of peculiarities of the optical variability of SS433, in particular, the substantial precessional variability at the primary optical eclipse minimum. For the mass function of the optical star f_v=0.268 M_\odot as derived from Hillwig and Gies (2008) data, the obtained q yields the masses of the components m_x=5 M_\odot, m_v=15 M_\odot, confirming the black hole nature of the relativistic object in SS433. The independence of the observed hard X-ray spectrum on the precession phase suggests that hard X-ray emission is formed in an extended hot corona. The Monte-Carlo simulations of the broadband X-ray spectrum of SS433 at the maximum disk opening precessional phases allowed us to determine physical parameters of the corona (temperature T_{cor}=20 keV, Thomson optical depth τ=0.2), and to estimate the jet mass outflow rate \dot M_j=3\times 10^{19} g/s yielding the kinetic power of the jets \sim 10^{39} erg/s.

12 pages, 10 figures, Proc. 7th INTEGRAL Workshop, Copenhagen, 8-11 September 2008

References in corpus (4)

• The Nature of SS433 and the Ultraluminous X-ray Sources
• Spectroscopic Observations of the Mass Donor Star in SS 433
• Diagnostics of the black hole candidate SS433 with the RXTE
• Monte-Carlo simulations of the broadband X-ray continuum of SS433

Cited by in corpus (12)

• The Evolution of Compact Binary Star Systems
• Multiwavelength Observations of the SS 433 Jets
• An Extended and More Sensitive Search for Periodicities in RXTE/ASM X-ray Light Curves
• The INTEGRAL view on Black Hole X-ray Binaries
• SS433: a massive X-ray binary at advanced evolutionary stage
• SS433's accretion disc, wind and jets: before, during and after a major flare
• INTEGRAL observations of SS433: system's parameters and nutation of supercritical accretion disk
• Monte-Carlo simulations of the broadband X-ray continuum of SS433
• Searching for Exoplanets Around X-Ray Binaries with Accreting White Dwarfs, Neutron Stars, and Black Holes
• An upper limit on nickel overabundance in the supercritical accretion disk wind of SS 433 from X-ray spectroscopy
• Mass flows and their behaviors in the SS433--W50 system
• Optical Light Curves of Luminous Eclipsing Black Hole X-ray Binaries