INTEGRAL observations of SS433, a supercritically accreting microquasar with hard spectrum\thanks
Sunyaev, R. A.; Postnov, K. A.; Cherepashchuk, A. M.; Molkov, S. V.; Seifina, E. V.; Panchenko, I. E.
Russia, Germany
Abstract
Observations of SS433 by INTEGRAL carried out in March-May 2003 are presented. SS433 is evidently detected on the INTEGRAL images of the corresponding sky region in the energy bands 25-50 and 50-100 keV. The precessional variability of the hard X-ray flux is clearly seen. The X-ray eclipse caused by the binary orbital motion is also detected. A possible origin of the hard continuum is briefly discussed.
Based on observations with INTEGRAL, an ESA project with instruments and science data centre funded by ESA member states (especially the PI countries: Denmark, France, Germany, Italy, Switzerland, Spain), Czech Republic and Poland, and with the participation of Russia and the USA.