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SRGe J194401.8+284452—an X-ray Cataclysmic Variable in the Field of the Gamma-Ray Source 4FGL J1943.9+2841
Irtuganov, E. N.; Kolbin, A. I.; Karpova, A. V. +19 more
We have carried out multiwavelength spectroscopic and photometric studies of the object SRGe J194401.8+284452 (2RXS J194401.4+284456, XMMSL2 J194402.0+284451, 2SXPS J194401.7+284450), the brightest X-ray source in the position uncertainty ellipse of the unidentified gamma-ray source 4FGL J1943.9+2841, with the goal of determining its nature and th…
New Active Galactic Nuclei Detected by the ART-XC and eROSITA Telescopes during the First Five SRG All-Sky X-ray Surveys
Gilfanov, M. R.; Medvedev, P. S.; Sunyaev, R. A. +8 more
We present the results of our identification of 14 X-ray sources detected in the eastern Galactic sky ($0^{\circ}<l<180^{\circ}$) in the 4-12 keV energy band on the combined map of the first five all-sky surveys (from December 2019 to March 2022) with the Mikhail Pavlinsky ART-XC telescope onboard the SRG observatory. All 14 sources are reli…
SRG/ART-XC Galactic Plane Survey near Galactic Longitude L 20°: Catalog of Sources
Sazonov, S. Yu.; Lutovinov, A. A.; Karasev, D. I. +11 more
We present a catalog of sources detected by the Mikhail Pavlinsky ART-XC telescope onboard the SRG space observatory during the observations of the Galactic plane region near a longitude l~20° (L20 field) in October 2019. The L20 field was observed four times in the scanning mode, which provided a uniform coverage of the sky region with a total ar…
X-ray Properties of the Luminous Quasar PG 1634+706 at z=1.337 from SRG and XMM-Newton Data
Gilfanov, M. R.; Sunyaev, R. A.; Sazonov, S. Yu. +2 more
In the fall of 2019, during the in-flight calibration phase of the SRG observatory, the onboard eROSITA and Mikhail Pavlinsky ART-XC telescopes carried out a series of observations of PG 1634+706 — one of the most luminous (an X-ray luminosity ${∼}10^{46}$ erg s${}^{-1}$) quasars in the Universe at $z<2$. Approximately at the same dates this qu…
SRGz: Building an Optical Cross-Match Model for the X-ray SRG/eROSITA Sources Using the Lockman Hole Data
Gilfanov, M. R.; Medvedev, P. S.; Meshcheryakov, A. V. +1 more
We present a probabilistic model built for the optical cross-match between the SRG/eROSITA X-ray sources and photometric data from the DESI Legacy Imaging Surveys. The model relies both on positional and photometric information on optical objects nearby X-ray sources and allows performing selection with precision and recall ${≈}94%$ (for $F_{\text…
Optical Cross-Match of SRG/eROSITA X-ray Sources Using the Deep Lockman Hole Survey as an Example
Gilfanov, M. R.; Belvedersky, M. I.; Bykov, S. D.
We present a method for the optical cross-match of sources detected in wide-field X-ray sky surveys. For this purpose, we have constructed and trained a neural network model to characterize the photometric attributes of the populations of optical counterparts of X-ray sources and optical field objects. The photometric information processing result…
Study of the X-ray Pulsar IGR J21343+4738 Based on NuSTAR, Swift, and SRG Data
Lutovinov, A. A.; Molkov, S. V.; Semena, A. N. +1 more
We present the results of our study of the X-ray pulsar IGR J21343+4738 based on NuSTAR, Swift, and SRG observations in the wide energy range 0.3-79 keV. The absence of absorption features in the energy spectra of the source, both averaged and phase-resolved ones, has allowed us to estimate the upper and lower limits on the magnetic field of the n…
Search for Magnetars in the Galaxy M31 as Periodic X-ray Sources Based on XMM-Newton Data
Popov, S. B.; Pshirkov, M. S.; Zolotukhin, I. Yu.
Several years ago a series of powerful millisecond radio bursts with close dispersion measures was detected toward the galaxy M31. Taking the hypothesis about the possible association of these radio bursts with a magnetar in M31 as a starting point, we have searched for periodic X-ray signal sources using data from the XMM-Newton X-ray telescope. …
Spectral Properties of Heavily Obscured Seyfert Galaxies from the INTEGRAL All-Sky Survey
Sazonov, S. Yu.; Krivonos, R. A.; Semena, A. N.
We have investigated the X-ray spectral properties of the ten heavily obscured nearby ( z < 0.1) active galactic nuclei (AGNs) IGR J00256+6821, NGC 1194, CGCG 420-015, IGR J09253+6929, NGC 3281, NGC 4939, IGR J14175-4641, NGC 5643, NGC 5728, and ESO 137-G034 from the catalogue of hard X-ray sources detected during the INTEGRAL seven-year all-sk…
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…