Search Publications
GRB 231115A—a Magnetar Giant Flare in the M82 Galaxy
Minaev, P. Yu.; Pozanenko, A. S.; Grebenev, S. A. +5 more
The results of a study of the short gamma-ray burst GRB 231115A in the X-ray and gamma-ray ranges are presented, based on data from the INTEGRAL and Fermi space observatories. The source of the burst is localized by the IBIS/ISGRI telescope of INTEGRAL observatory with an accuracy of ${≤}1.\!\!^'5$, it is located in the Cigar Galaxy (M 82). Early …
Study of the Carbon Star T Draconis
Tatarnikov, A. M.; Shenavrin, V. I.; Zheltoukhov, S. G. +2 more
We present the results of the infrared photometric observations in the $JHKLM$ bands and infrared spectroscopic observations in the range 1-2.5 $µ$m for the carbon Mira star T Dra performed from 2019 to 2023. An analysis of the photometric observations shows the presence of both pulsational brightness fluctuations with an amplitude falling f…
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…
Humps on the Profiles of the Radial-Velocity Distribution and the Age of the Galactic Bar
Melnik, A. M.; Podzolkova, E. N.
We studied the model of the Galaxy with a bar which reproduces well the distributions of the observed radial, VR, and azimuthal, VT, velocities derived from the Gaia DR3 data along the Galactocentric distance R. The model profiles of the distributions of the velocity VR demonstrate a periodic increase and the forma…
Deep Hard X-ray Survey of the M81 Field Based on INTEGRAL1 Data
Sazonov, S. Yu.; Mereminskiy, I. A.; Krivonos, R. A.
We have carried out a deep survey of the M81 field in the 25-60 keV energy band based on long-term (2003-2023) INTEGRAL observations. A record sensitivity of 0.16 mCrab at a detection significance of $4σ$ has been achieved in the central part of the field owing to the long accumulated exposure (19.2 Ms). The total area of the survey is 1004 deg${}…
Parameters of the Possible Companion of the Neutron Star toward the Supernova Remnant G315.4–2.30
Pakhomov, Yu. V.
Based on low-resolution (
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…