Scientific results

Numerical simulations of a propagating slow magnetoacoustic wave guided by a field-aligned low-β plasma nonuniformity are performed in terms of ideal magnetohydrodynamics, aiming at modeling propagating extreme ultraviolet (EUV) emission disturbances observed in the solar corona. read more →

We present an optical-to-radio study of the BL Lac object S4 0954+658 observations during 1998-2023. read more →

This article presents the results of evaluating the possibility of conducting radio astronomy studies in the windows of atmospheric transparency ~100, ~230, and ~350 GHz using the optical Big Telescope Alt-Azimuthal (BTA) of the Special Astrophysical Observatory of the Russian Academy of Sciences (SAO RAS). read more →

We present the results of our study of cross-correlations between long-term multi-band observations of the radio variability of the blazar 3C 279.  read more →

We have received a new physical characteristics fitting based on actual observational data from the Swift mission's long-duration gamma-ray bursts (LGRBs).  read more →

The development of methods for the radio frequency interference mitigation becomes a fundamental challenge for any radio astronomy research.  read more →

In this paper, the first in a series of four articles, the scientific goals of the Metron project are highlighted, and the characteristics of the cosmic objects available for study within its framework are provided.  read more →

We report on a campaign on the bright black hole X-ray binary Swift J1727.8 − 1613 centered around five observations by the Imaging X-ray Polarimetry Explorer (IXPE).  read more →

The existence of high-energy astrophysical neutrinos has been unambiguously demonstrated, but their sources remain elusive. IceCube reported an association of a 290-TeV neutrino with a gamma-ray flare of TXS 0506+056, an active galactic nucleus with a compact radio jet pointing to us. read more →

We have almost daily observed the black hole candidate X-ray binary Swift J1727.8-1613 on 14-30 September 2023 with the ''Southern Sector and Flat mirror'' antenna and later from 1 October 2003 with the ''Northern Sector'' antenna of the RATAN-600 radio telescope (SAO RAS) using the similar radiometers at 4.7, 8.2, 11.2 and 22.3 GHz, but also we have 2.3 GHz radiometer at the second antenna. read more →

The paper presents results of calculating the RATAN-600 beam pattern (BP) and BP drift scans of point radio sources in the West Sector radio telescope operation mode at a frequency of 4.7 GHz. read more →

Earlier, we showed that according to the nature of the location of sources of preflare X-ray pulsations relative to the main solar flare, events are divided into at least two types: in type I events, the sources of pulsations and the main flare are in the same active region (AR) and in type II events they are in different regions. read more →

An important and interesting issue is brought to notice in the standard linear theory of the magnetoacoustic waves in the homogeneous magnetic flux tubes with an abrupt magnetic boundary, which are representative of the coronal, chromospheric, and photospheric loops of the solar atmosphere. read more →

We have detected beginning of a bright flare from the microquasar GRS1915+105 in the daily monitoring of microquasars with the RATAN-600 radio telescope. read more →

The Square Kilometre Array Observatory (SKAO) will explore the radio sky to new depths in order to conduct transformational science. SKAO data products made available to astronomers will be correspondingly large and complex, requiring the application of advanced analysis techniques to extract key science findings. read more →

The process of Compton scattering by a free electron with subsequent reemission of one or two photons is considered in the assumption of finite interaction time. read more →

We have been carrying out daily observations of bright microquasars at 1.2–20 GHz with the Northern sector of the RATAN-600 radio telescope for more than ten years. read more →

We study the broadband emission of the TeV blazar Mrk501 using multi-wavelength (MWL) observations from 2017 to 2020 performed with a multitude of instruments, involving, among others, MAGIC, Fermi-LAT, NuSTAR, Swift, GASP-WEBT, and OVRO. read more →

The modulation of the intensity of microwave emission from a plasma slab caused by a standing linear kink fast magnetoacoustic wave is considered. read more →

We report the historical high flux density level for the blazar of unknown type MG2 J144640+3110 at 5-22 GHz.Simultaneous radio spectrum of MG2 J144640+3110 after its gamma-ray activity read more →

We present the measurement results for the spectral flux densities of 19 calibration sources observed with the RT-22 single-dish telescope of the Crimean Astrophysical Observatory of the Russian Academy of Sciences at 22.2 and 36.8 GHz in 2017-2020. read more →