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 (