5 papers
Compact and Diffuse Sources in the Galactic Center Region
E. Churazov, M. Gilfanov, R. Sunyaev +1
The 10 by 10 degrees region around dynamic center of our Galaxy is known to host a large number of bright X-ray sources, most of which are low mass binary systems. While high lumin…
Scattering of X-ray emission lines by a helium atom
L. Vainshtein, R. Sunyaev, E. Churazov
The differential cross section for scattering of the astrophysically important X-ray emission lines by a helium atom is calculated with an accuracy sufficient for astrophysical app…
SIGMA observations of X-ray Nova Velorum 1993 (GRS 1009-45)
P. Goldoni, M. Vargas, A. Goldwurm +13
We report on hard X-ray observations of X-ray Nova Velorum 1993 (GRS 1009-45) performed with the SIGMA coded mask X-ray telescope in January 1994. The source was clearly detected w…
Properties Of The Hard X-ray Emission From The Black Hole Candidates: Cygnus X-1 And 1E1740.7-2942
S. Kuznetsov, M. Gilfanov, E. Churazov +13
The entire dataset of the GRANAT/SIGMA observations of Cyg X-1 and 1E1740.7-2942 in 1990-1994 was analyzed in order to search for correlations between primary observational charact…
Scattering of X-ray emission lines by the neutral and molecular hydrogen in the Sun's atmosphere and in the vicinity of active galactic nuclei and compact sources
R. Sunyaev, E. Churazov
In many astrophysical objects an account for scattering of the X-ray fluorescent and resonance lines of iron ions by the electrons, bound in atomic and molecular hydrogen is import…