Search Publications
Recurrent Symbiotic Nova T Coronae Borealis before Outburst
Strakhov, I. A.; Tatarnikov, A. M.; Shenavrin, V. I. +5 more
The results of photometric and spectral observations of T CrB obtained in a wide range of wavelengths in 2011-2023 are presented. We use the near-IR light curves to determine a new ephemeris $JD_{\textrm{min}}=2455828.9+227.55E$ for the times of light minima when the red giant is located between the observer and the hot component. The flux ratio H…
Peculiarities of Open Star Clusters with High Vertical Velocities from the Region of the Sco-Cen OB Association
Bobylev, V. V.; Bajkova, A. T.
We have studied the kinematics of a unique sample of young open star clusters (OSCs) with high vertical velocities, $15<W<40$ km s${}^{-1}$. The characteristics of these clusters were taken from the catalogue by Hunt and Reffert (2023), where their mean proper motions, line-of-sight velocities, and distances were calculated using Gaia DR3 da…
New Interstellar Extinction Maps Based on Gaia and Other Sky Surveys
Savchenko, S. S.; Gontcharov, G. A.; Il'in, V. B. +5 more
We present new three-dimensional (3D) interstellar extinction maps in the $V$ and Gaia $G$ filters within 2 kpc of the Sun, a 3D differential extinction (dust spatial distribution density) map along lines of sight in the same space, a 3D map of variations in the ratio of the extinctions in the $V$ and Gaia $G$ filters within 800 pc of the Sun, and…
Determination of the Spiral Pattern Speed in the Milky Way from Young Open Star Clusters
Bobylev, V. V.; Bajkova, A. T.
We have estimated the spiral pattern speed in the Galaxy $Ωp$ from a large sample of young open star clusters (OSCs). For this purpose, we have used 2494 OSCs younger than 50 Myr. Their mean proper motions, line-of-sight velocities, and distances were calculated by Hunt and Reffert (2023) based on data from the Gaia DR3 catalogue. Three…
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…
Determination of the Spiral Pattern Speed in the Galaxy from Three Samples of Stars
Bobylev, V. V.; Bajkova, A. T.
We invoke the estimates of the amplitudes of the velocity perturbations $fR$ and $f_{θ}$ caused by the influence of a spiral density wave that have been obtained by us previously from three stellar samples. These include Galactic masers with measured VLBI trigonometric parallaxes and proper motions, OB2 stars, and Cepheids. From these d…
Search for AGNs in Dwarf Galaxies in the the M81 Field with INTEGRAL Data
Sazonov, S. Yu.; Karachentsev, I. D.; Mereminskiy, I. A. +1 more
Using long-term INTEGRAL hard X-ray observations, we have put upper limits on the bolometric luminosity ($L_{\textrm{bol}}\lesssim 10^{41}$ erg s${}^{-1}$) of the nuclei of 72 nearby dwarf galaxies located in the M81 field. This has allowed us to constrain the fraction of galaxies in which the central black hole accretes matter at a rate above 0.1…
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…
Chromatic Afterglow of GRB 200829A
Minaev, P. Yu.; Pozanenko, A. S.; Volnova, A. A. +16 more
We present the results of our analysis of multiwavelength observations for the long gamma-ray burst GRB 200829A. The burst redshift $z≈ 1.29± 0.04$ has been determined photometrically at the afterglow phase. In gamma rays the event is one of the brightest (in isotropic equivalent), $E_{\textrm{iso}}\gtrsim 10^{54}$ erg. The multicolor light curve …
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…