49 citations · 380 across the 29 of their papers we have counts for
30 papers
Photometric and late-time spectropolarimetric observations of GRB 250129A afterglow
A. Ghosh, S. Razzaque, J. Barnard +15
Gamma-Ray Burst (GRB) afterglows arise from the interaction of relativistic ejecta with the circumburst medium and are observed across the electromagnetic spectrum. Afterglow polar…
Here Be SDRAGNs - Spiral Galaxies Hosting Large Double Radio Sources
Jean Tate, William C. Keel, Michael O'Keeffe +16
We present a sample of large double radio sources hosted by spiral galaxies (Spiral Double Radio Active Galactic Nuclei, SDRAGNs). Candidates were selected during Radio Galaxy Zoo,…
Optical Identification and Spectroscopic Redshift Measurements of 216 Galaxy Clusters from the SRG/eROSITA All-Sky Survey
I. A. Zaznobin, R. A. Burenin, A. A. Belinski +34
We present the results of the optical identification and spectroscopic redshift measurements of 216 galaxy clusters detected in the SRG/eROSITA all-sky X-ray survey. The spectrosco…
Small telescopes being effective: MAGIC or not?
Victor L. Afanasiev, Eugene A. Malygin, Elena S. Shablovinskaya +4
The paper describes the MAGIC multi-mode focal reducer (Monitoring of Active Galaxies by Investigation of their Cores), commissioned on the 1-m Zeiss-1000 telescope of the Special…
Polarimetric Reverberation Mapping in Medium-Band Filters
Elena Shablovinskaya, Luka Č. Popović, Roman Uklein +8
Earlier, we suggested the "reload" concept of the polarimetric reverberation mapping of active galactic nuclei (AGN), proposed for the first time more than 10 years ago. We have su…
Observations of the luminous red nova AT 2021biy in the nearby galaxy NGC 4631
Y. -Z. Cai, A. Pastorello, M. Fraser +73
We present an observational study of the luminous red nova (LRN) AT\,2021biy in the nearby galaxy NGC\,4631. The field of the object was routinely imaged during the pre-eruptive st…
Observational insights on the formation scenarios of giant low surface brightness galaxies
Anna Saburova, Igor Chilingarian, Anastasia Kasparova +4
Giant low surface brightness galaxies (gLSBGs) with the disk radii of up to 130 kpc represent a challenge for currently accepted theories of galaxy formation and evolution, because…
The TELPERION Survey for Distant [O III] Clouds around Luminous and Hibernating AGN
William C. Keel, Alexei Moiseev, D. V. Kozlova +5
We present a narrowband [O III] imaging survey of 111 AGN hosts and 17 merging-galaxy systems, in search of distant extended emission-line regions (EELRs) around AGN (either extant…
Observation of a very massive galaxy cluster at z=0.76 in SRG/eROSITA all-sky survey
R. A. Burenin, I. F. Bikmaev, M. R. Gilfanov +16
The results of multiwavelength observations of the very massive galaxy cluster SRGe CL2305.2-2248 detected in X-rays during the first SRG/eROSITA all-sky survey are discussed. This…
Discovery of the most X-ray luminous quasar SRGE J170245.3+130104 at redshift z
G. A. Khorunzhev, A. V. Meshcheryakov, P. S. Medvedev +10
SRGE J170245.3+130104 was discovered by the eROSITA telescope aboard the SRG space observatory on March 13-15, 2020 during the first half-year scan of its all-sky X-ray survey. The…
Measurement of the supermassive black hole masses in two active galactic nuclei by the photometric reverberation mapping method
E. A. Malygin, E. S. Shablovinskaya, R. I. Uklein +1
We present the results of long-term photometric monitoring of two active galactic nuclei, 2MASX J08535955+7700543 (z 0.106) and VII Zw 244 (z 0.131), being investigat…
Stokes-polarimeter for 1-meter telescope
Victor Afanasiev, Elena Shablovinskaya, Roman Uklein +1
We present the "StoP" photometer-polarimeter (Stokes-polarimeter) used for observations with the 1-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sc…
Observational insights on the origin of giant low surface brightness galaxies
Anna Saburova, Igor Chilingarian, Anastasia Kasparova +4
Giant low surface brightness galaxies (gLSBGs) with dynamically cold stellar discs reaching the radius of 130 kpc challenge currently considered galaxy formation mechanisms. We ana…
Unveiling the origin of giant low surface brightness discs: results of the long-slit spectral observations
Anna S. Saburova, Igor V. Chilingarian, Anastasia V. Kasparova +3
Giant low surface brightness galaxies (gLSB) with radii of discs as large as 130 kpc challenge galaxy formation scenarios and it is still not well understood how they form and evol…
Medium-band photometric reverberation mapping of AGNs at . Techniques and sample
Eugene Malygin, Roman Uklein, Elena Shablovinskaya +2
The most popular method of the broad-line region size estimation in active galactic nuclei (AGN) is the reverberation mapping based on measuring the time delay between the continuu…
Photometric reverberation mapping of AGNs at 0.1 < z < 0.8: I. Observational technique
Roman Uklein, Eugene Malygin, Elena Shablovinskaya +2
The improvement of the calibration relation for determining the size of the broad-line region from the observed optical luminosity of active galactic nuclei (AGN) is a necessary ta…
3D structure of HII region Sh2-235 from tunable-filter optical observations
M. S. Kirsanova, P. A. Boley, A. V. Moiseev +2
We present observations of the H-alpha, H-beta, [SII] 6716, 6731 and [NII] 6583 emission lines in the galactic HII region Sh2-235 with the Mapper of Narrow Galaxy Lines (MaNGaL), a…
UGC 1378 -- a Milky Way-sized galaxy embedded in a giant low-surface brightness disc
Anna Saburova, Igor Chilingarian, Anastasia Kasparova +3
The dominant physical processes responsible for the formation and longevity of giant gaseous and stellar discs in galaxies remain controversial. Although they are rare (less than 1…
A Malin 1 'cousin' with counter-rotation: internal dynamics and stellar content of the giant low surface brightness galaxy UGC 1922
Anna S. Saburova, Igor V. Chilingarian, Ivan Yu. Katkov +5
The formation scenario for giant low surface brightness (gLSB) galaxies with discs as large as 100 kpc still remains unclear. These stellar systems are rare and very hard to observ…
SCORPIO-2 Guiding and Calibration System in the Prime Focus of the 6-m Telescope
Victor L. Afanasiev, Vladimir R. Amirkhanyan, Alexei V. Moiseev +2
We describe a device (adapter) for off-axis guiding and photometric calibration of wide-angle spectrographs operating in the prime focus of the 6-m telescope of the Special Astroph…
The study of two barred galaxies with curious kinematical features
A. S. Saburova, I. Yu. Katkov, S. A. Khoperskov +2
We performed long-slit spectral observations of two SB-type galaxies: NGC 5347, UGC 1344. They were previously suspected as the galaxies with unusually low mass-to-light ratios (on…
Interacting galaxy NGC4656 and its unusual dwarf companion
Anatoly V. Zasov, Anna S. Saburova, Oleg V. Egorov +1
We studied the nearby edge-on galaxy NGC4656 and its dwarf low surface brightness companion with the enhanced UV brightness, NGC4656UV, belonging to the interacting system NGC4631/…
Stellar counter-rotation in lenticular galaxy NGC 448
Ivan Yu. Katkov, Olga K. Sil'chenko, Igor V. Chilingarian +2
The counter-rotation phenomenon in disc galaxies directly indicates a complex galaxy assembly history which is crucial for our understanding of galaxy physics. Here we present the…
Long-slit spectral observations and stellar mass-to-light ratio of spiral galaxy UGC11919
A. Saburova, A. Zasov, R. Uklein +1
We performed the long-slit observations of spiral galaxy UGC11919 with the Russian 6-m telescope to study its kinematics and stellar population. The previous studies gave basis to…