Search Publications
Cutoff in the hard X-ray spectra of the ultraluminous X-ray sources HoIX X-1 and M82 X-1
Sazonov, S. Yu.; Lutovinov, A. A.; Krivonos, R. A.
Using data from the XMM-Newton and INTEGRAL observatories, we have detected a cutoff at energies above 10 keV in the X-ray spectra of the ultraluminous X-ray sources HoIX X-1 and M82 X-1. The spectra obtained can be described by amodel of Comptonization of radiation in a gas cloud of moderate temperature ( kT ∼ 2-3 keV) and high optical depth ( τ …
Aperiodic X-ray flux variability of EX Hya and the area of the base of the accretion column at the white dwarf surface
Revnivtsev, M. G.; Semena, A. N.
The goal of this paper is to determine the characteristic cooling time of the accretion flowmatter near the surface of the magnetic white dwarf in the binary system EX Hya. Most of the X-ray photons in such binary systems are produced in an optically thin hot plasma with a temperature above 10 keV heated when the matter passes through the shock ne…