Scientific results

The accretion of matter by compact objects can be inhibited by radiation pressure if the luminosity exceeds a critical value known as the Eddington limit. read more →

The flux density spectra of cyclotron sources above the sunspots were obtained by observations with RATAN-600 in the range of 1.7–10 cm with high spectral resolution and their spectral indices were estimated.  read more →

The article discusses the prospects for developing the observational base at the Special Astrophysical Observatory of the Russian Academy of Sciences (SAO RAS) for astrophysical research in the millimeter-wave range.  read more →

The results of the analysis of 205 brightest sources, which were found in the sky survey at the declination of the pulsar in the Crab Nebula, are presented. read more →

We present a study of the radio variability of bright, S1.4≥100 mJy, high-redshift quasars at z≥3 on timescales of up to 30–40 yrs. The study involved simultaneous RATAN-600 measurements at the frequencies of 2.3, 4.7, 8.2, 11.2, and 22.3 GHz in 2017–2020.  read more →

We carry out the long-term multi-frequency monitoring of the Galactic microquasars with the RATAN-600 radio telescope almost daily in 2024 at 1.24-30 GHz. We have detected the activity from the microquasar Cygnus X-3 on 27 March after the long period of the very low hard X-ray state at 15-50 keV, named by a hyper-soft state, as according to the Swift/BAT public domain data. read more →

Based on the collected multiwavelength data, namely in the radio (NVSS, FIRST, RATAN-600), IR (WISE), optical (Pan-STARRS), UV (GALEX), and X-ray (ROSAT, Swift-XRT) ranges, we have performed a cluster analysis for the blazars of the Roma-BZCAT catalog. read more →

The microquasar Cyg X-3 entered in the hyper-soft X-ray state in mid January 2024 (Swift/BAT monitor). Bright radio flares of different intensity were observed by the Nasu telescope array (ATels #16455, #16520) and with the Allen Telescope Array (ATA; ATel #16466) in February 2024. read more →

Context : Understanding the mechanisms that launch and shape powerful relativistic jets from supermassive black holes (SMBHs) in high-redshift active galactic nuclei (AGN) is crucial for probing the co-evolution of SMBHs and galaxies over cosmic time. read more →

The blazar Ton 599 showed the strongest radio flares in its history almost a year ago, in February 2023 (#ATels 15872, 15873, 15894).  read more →

We present the results of our observations using the Giant Meterwave Radio Telescope (GMRT) to investigate the radio continuum and OH line emission of 10 OHM candidates from the Arecibo Legacy Fast ALFA (ALFALFA) survey.  read more →

Eurasian patent for an invention has been received: Method for generating a catalog of measurements of radio emission parameters from blazars. read more →

Patent has been received for an invention: Method for measuring the parameters of radio emission from blazars to form a catalog of them. read more →

<div>Study of high-redshift radio galaxies (HzRGs) can shed light on the active galactic nuclei (AGNs) evolution in massive elliptical galaxies. The vast majority of observed high-redshift AGNs are quasars, and there are very few radio galaxies at redshifts z>3.</div>
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Aims. The X-ray luminous and radio-loud AGN SRGE J170245.3+130104 discovered at z ∼ 5.5 provides unique chances to probe the SMBH growth and evolution with powerful jets in the early Universe. 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 →