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An Upper Limit on Nickel Overabundance in the Supercritical Accretion Disk Wind of SS 433 from X-ray Spectroscopy
Medvedev, P. S.; Tsygankov, S. S.; Sazonov, S. Yu. +2 more
We analyze a long (with a total exposure time of 120 ks) X-ray observation of the unique Galactic microquasar SS 433 carried out by the XMM-Newton space observatory with the goal of searching for the fluorescent line of neutral (or weakly ionized) nickel at energy 7.5 keV. We consider two models for the formation of fluorescent lines in the spectr…
Optical Identification of X-ray Sources from the 14-Year INTEGRAL All-Sky Survey
Medvedev, P. S.; Lutovinov, A. A.; Eselevich, M. V. +6 more
We present the results of our optical identifications of several hard X-ray sources from the INTEGRAL all-sky survey obtained over 14 years of observations. Having improved the positions of these objects in the sky with the X-ray telescope (XRT) of the Swift observatory and the XMMNewton observatory, we have identified their counterparts using opt…
X-ray Luminosity Function of Quasars at 3 < z < 5 from XMM-Newton Serendipitous Survey Data
Sazonov, S. Yu.; Khorunzhev, G. A.; Burenin, R. A.
The X-ray luminosity function of distant (3 < z < 5.1) type 1 quasars has been measured. A sample of distant high-luminosity (1045 erg s-1 ≤ L X,2-10 < 7.5×1045 erg s-1 in the 2-10 keV energy band) quasars from the catalog by Khorunzhev et al. (2016) compiled from the data of the 3XMM…