Search Publications
X-ray nova MAXI J1828-249. Evolution of the broadband spectrum during its 2013-2014 outburst
Grebenev, S. A.; Burenin, R. A.; Krivonos, R. A. +2 more
Based on data from the SWIFT, INTEGRAL, MAXI/ISS orbital observatories, and the ground-based RTT-150 telescope, we have investigated the broadband (from the optical to the hard X-ray bands) spectrum of the X-ray nova MAXI J1828-249 and its evolution during the outburst of the source in 2013-2014. The optical and infrared emissions from the nova ar…
Catalog of candidates for quasars at 3 < z < 5.5 selected among X-Ray sources from the 3XMM-DR4 survey of the XMM-Newton observatory
Sazonov, S. Yu.; Khorunzhev, G. A.; Burenin, R. A. +1 more
We have compiled a catalog of 903 candidates for type 1 quasars at redshifts 3 < z < 5.5 selected among the X-ray sources of the "serendipitous" XMM-Newton survey presented in the 3XMMDR4 catalog (the median X-ray flux is ≈5 × 10-15 erg s-1 cm-2 in the 0.5-2 keV energy band) and located at high Galactic latit…
Stellar subsystems of the galaxy NGC 1313
Tikhonov, N. A.; Galazutdinova, O. A.
Based on archival Hubble Space Telescope (HST) ACS/WFC images, we have performed stellar photometry for eight fields of the spiral galaxy NGC 1313 and its satellite, the low-mass Sph/Irr galaxy AM0319-662. Stars of various ages have been identified on the constructed Hertzsprung-Russell diagrams: young supergiants, middle-aged stars, and old stars…
Peculiarities of the accretion flow in the system HL CMa
Lutovinov, A. A.; Revnivtsev, M. G.; Semena, A. N. +2 more
The properties of the aperiodic luminosity variability for the dwarf novaHLCMa are considered. The variability of the system HL CMa is shown to be suppressed at frequencies above 0.7 × 10-2 Hz. Different variability suppression mechanisms related to the radiation reprocessing time, partial disk evaporation, and characteristic variabilit…
Spectroscopic study of the peculiar galaxy IC 883
Burenkov, A. N.; Karataeva, G. M.; Yakovleva, V. A. +3 more
We analyze new optical spectroscopic observations obtained at the 6-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences with the SCORPIO focal reducer (in the modes of a Fabry-Perot interferometer (FPI) and long-slit spectroscopy) and the Multi-Pupil Fiber Spectrograph for the galaxy IC 883. We have confirmed th…
M 101 group galaxies
Tikhonov, N. A.; Galazutdinova, O. A.; Lebedev, V. S.
Based on archival Hubble Space Telescope images, we have performed stellar photometry for the galaxy M 101 and other neighboring galaxies located at a small angular distance from M 101 and having radial velocities similar to that of M 101: M 51, M 63, NGC 5474, NGC 5477, UGC 9405, Ho IV, KUG1413+573, and others. Based on the TRGB method, we have d…
Determination of parameters of Long-Term variability of the X-ray pulsar LMC X-4
Lutovinov, A. A.; Falanga, M.; Molkov, S. V.
We have investigated the temporal variability of the X-ray flux measured from the high-mass X-ray binary LMCX-4 on time scales from several tens of days to tens of years, i.e., exceeding considerably the orbital period (~1.408 days). In particular, we have investigated the 30-day cycle of modulation of the X-ray emission from the source (superorbi…
Steep-spectrum sources of the RCR catalog in the millimeter and submillimeter ranges based on Planck data
Verkhodanov, O. V.; Majorova, E. K.; Zhelenkova, O. P. +2 more
We have investigated the regions of cosmic microwave background maps from the Planck experiment in the neighborhoods of radio sources from the RCR catalog. Based on the measurements of sources from the Planck catalog, we have constructed the calibration curves to determine the brightness of objects. For 34 steep-spectrum objects, for the first tim…
IGR J17463-2854, a possible symbiotic binary system in the galactic center region
Tsygankov, S. S.; Lutovinov, A. A.; Karasev, D. I.
This paper is devoted to determining the nature of the hard X-ray source IGR J17463-2854 located toward the Galactic bulge. Using data from the INTEGRAL and Chandra X-ray observatories, we show that five point X-ray sources with approximately identical fluxes in the 2-10 keV energy band are detected in the error circle of the object under study. I…
JEM-X/INTEGRAL X-ray survey of the galactic center region
Grebenev, S. A.; Mereminskiy, I. A.
An X-ray survey of the Galactic center region with a radius of ~20° has been performed using the data obtained with the JEM-X telescope onboard the INTEGRAL observatory over ~10 years of observations (2003-2013). The exposure at the field center directly toward the Galactic center has reached 4.8 Ms. We have constructed sky maps in the 5-10 and 10…