Search Publications
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…
Residual HCRF rotation relative to the inertial coordinate system
Bobylev, V. V.
VLBI measurements of the absolute proper motions of 23 radio stars have been collected from published data. These are stars with maser emission, or very young stars, or asymptotic-giant-branch stars. By comparing these measurements with the stellar proper motions from the optical catalogs of the Hipparcos Celestial Reference Frame (HCRF), we have …
Determining the nature of faint X-ray sources from the ASCA Galactic center survey
Bikmaev, I. F.; Tsygankov, S. S.; Lutovinov, A. A. +6 more
We present the results of the the identification of six objects from the ASCA Galactic center and Galactic plane surveys: AX J173548-3207, AX J173628-3141, AX J1739.5-2910, AX J1740.4-2856, AX J1740.5-2937, and AX J1743.9-2846. Chandra, XMM-Newton, and XRT/Swift X-ray data have been used to improve the positions of the optical counterparts to thes…
QPO and LFN in the power spectrum of rapid variability for the X-ray nova SWIFT J174510.8-262411
Grebenev, S. A.; Prosvetov, A. V.
Results of the study of the X-ray nova SWIFT J174510.8-262411 by the INTEGRAL, SWIFT, and VLA observatories in September-October 2012 at the early outburst phase are presented. Attention is focused on analyzing the power spectrum of X-ray flux fluctuations of the source in which a powerful quasi-periodic oscillation (QPO) peak has been detected. T…