157 citations · 461 across the 43 of their papers we have counts for
45 papers
CoRGI in MaNGA - II. NGC 5717: cold-gas accretion and disk growth in a BGG
Damir Gasymov, Ivan Yu. Katkov, Eva K. Grebel +6
Large-scale stellar counter-rotation, in which two coplanar stellar components rotate in opposite directions, is usually interpreted as a signature of external gas accretion. Such…
Giant Low-Surface Brightness Galaxies in the Global Picture of Galaxy Formation and Evolution
Fedor M. Kolganov, Igor V. Chilingarian, Anna S. Saburova +5
Giant low-surface brightness galaxies (gLSBGs) challenge standard merger-driven galaxy assembly models due to their large, dynamically cold disks, with radii often larger than 100~…
Ram-pressure-induced star formation in low-mass galaxies infalling on-to the Coma cluster: insights from DESI
Kirill A. Grishin, Igor V. Chilingarian, Gary A. Mamon +2
Ram-pressure stripping is a key driver of galaxy morphological transformation in clusters, contributing to the formation of quenched, especially dwarf, populations. Ram-pressure co…
Optical Emission-Line Properties of eROSITA-selected SDSS-V Galaxies
Nadiia G. Pulatova, Evgenii Rubtsov, Igor V. Chilingarian +21
We present and discuss optical emission line properties obtained from the analysis of Sloan Digital Sky Survey (SDSS) spectra for an X-ray selected sample of 3684 galaxies (0.002 <…
A Census of Compact Elliptical Galaxies in the Coma Cluster
Aleksandra V. Sharonova, Kirill A. Grishin, Igor V. Chilingarian +3
Compact elliptical (cE) galaxies are compact stellar systems with stellar masses of and radii typically < 0.6 kpc. Here we investigate the prop…
Broad line region echo from highly accreting intermediate-mass black hole candidate SDSS J144850.08+160803.1. The first probe of intra-night variability and reverberation mapping
Mariia Demianenko, Anton Afanasiev, Evgenii Rubtsov +8
Elusive intermediate-mass black holes (IMBHs) can be used as ``time-squeezing'' machines, enabling studies of AGN geometry via reverberation mapping on much shorter timescales than…
Multi-wavelength study of a hyperluminous X-ray source near NGC 6099: a strong IMBH candidate
Yi-Chi Chang, Roberto Soria, Albert K. H. Kong +3
We report on the intriguing properties of a variable X-ray source projected at the outskirts of the elliptical galaxy NGC 6099 ( Mpc). If truly located near NGC 6099…
NGC 3259: A Signal for an Untapped Population of Slowly Accreting Intermediate-Mass Black Holes
Kirill A. Grishin, Igor V. Chilingarian, Francoise Combes +4
Low-mass active galactic nuclei (AGNs) can provide important constraints on the formation and evolution of supermassive black holes (SMBHs), a central challenge in modern cosmology…
Nonlinear fitting of undersampled discrete datasets in astronomy
Igor Chilingarian, Kirill Grishin
Data analysis and interpretation often relies on an approximation of an empirical dataset by some analytic functions or models. Actual implementations usually rely on a non-linear…
Optical spectroscopy of host-galaxies of intermediate mass black holes: evolution of central black holes
V. Goradzhanov, I. Chilingarian, M. Demianenko +6
Intermediate-mass black holes (IMBHs) with masses below () are pivotal in understanding the origin and growth mechanisms of supermassive black holes (SMBHs…
Spectroscopic confirmation of the galaxy clusters CARLA J0950+2743 at z=2.363, and CARLA-Ser J0950+2743 at z=2.243
Kirill A. Grishin, Simona Mei, Igor V. Chilingarian +6
Galaxy clusters, being the largest gravitationally bound structures in the Universe, are a powerful tool to study mass assembly at different epochs. At z2 they give an unique op…
A closer look at the extended edge-on low-surface brightness galaxies
Anna S. Saburova, Damir Gasymov, Evgenii V. Rubtsov +13
To understand the origin of extended disks of low-surface brightness (LSB) galaxies, we studied in detail 4 such systems with large disks seen edge-on. Two of them are edge-on gian…
Non-negative matrix factorization approach to sky subtraction for optical spectroscopy
Fedor Kolganov, Igor Chilingarian, Kirill Grishin
Numerous sky background subtraction techniques have been developed since the first implementations of computer-based reduction of spectra. Kurtz & Mink (2000) described a singular…
Color Transformations of Photometric Measurements of Galaxies in Optical and Near-Infrared Wide-Field Imaging Surveys
Victoria A. Toptun, Igor V. Chilingarian, Kirill A. Grishin +1
Over the past 2 decades, wide-field photometric surveys in optical and infrared domains reached a nearly all-sky coverage thanks to numerous observational facilities operating in b…
Dark matter content and dynamical masses of ultra-diffuse galaxies in the Coma cluster
Igor Chilingarian, Kirill Grishin, Anton V. Afanasiev +6
Ultra-diffuse galaxies (UDGs) are spatially extended, low surface brightness stellar systems with regular elliptical-like morphology found in large numbers in galaxy clusters and g…
Dwarf early-type galaxies in the Coma cluster: internal dynamics, stellar populations
Igor Chilingarian, Kirill Grishin, Anton V. Afanasiev +6
We present preliminary results from our spectroscopic survey of low-luminosity early-type galaxies in the Coma cluster conducted with the Binospec spectrograph at the 6.5~m MMT. Fr…
YOLO-CL: Galaxy cluster detection in the SDSS with deep machine learning
Kirill Grishin, Simona Mei, Stéphane Ilic
(Abridged) Galaxy clusters are a powerful probe of cosmological models. Next generation large-scale optical and infrared surveys will reach unprecedented depths over large areas an…
New Generation Stellar Spectral Libraries in the Optical and Near-Infrared I: The Recalibrated UVES-POP Library for Stellar Population Synthesis
Sviatoslav Borisov, Igor Chilingarian, Evgenii Rubtsov +8
We present re-processed flux calibrated spectra of 406 stars from the UVES-POP stellar library in the wavelength range 320-1025 nm, which can be used for stellar population synthes…
The volume density of giant low surface brightness galaxies
Anna S. Saburova, Igor V. Chilingarian, Andrea Kulier +5
Rare giant low surface brightness galaxies (gLSBGs) act as a stress test for the current galaxy formation paradigm. To answer the question `How rare are they?' we estimate their vo…
KDG 64: a large dwarf spheroidal or a small ultradiffuse satellite of Messier 81
Anton V. Afanasiev, Igor V. Chilingarian, Kirill A. Grishin +5
Low-mass early-type galaxies, including dwarf spheroidals (dSph) and brighter dwarf ellipticals (dE), dominate the galaxy population in groups and clusters. Recently, an additional…
Optical Variability of "Light-weight" Supermassive Black Holes at a Few Percent Level from ZTF Forced-Photometry Light Curves
Mariia Demianenko, Kirill Grishin, Victoria Toptun +4
Large time-domain surveys provide a unique opportunity to detect and explore variability of millions of sources on timescales from days to years. Broadband photometric variability…
Optical spectroscopic observations of intermediate-mass black holes and their host galaxies: the relation
Vladimir Goradzhanov, Igor Chilingaryan, Ivan Katkov +4
Intermediate-mass black holes (IMBHs; ) in galaxy centers are cruciel for painting a coherent picture of the formation and growth of supermassive black…
Confirmation of intermediate-mass black holes candidates with X-ray observations
Victoria Toptun, Igor Chilingarian, Kirill Grishin +5
The origin of supermassive black holes (SMBH) in galaxy centers still remains uncertain. There are two possible ways of their formation - from massive () and…
Optical light curves of light-weight supermassive black holes produced by the Zwicky Transient Facility Forced Photometry Service
Mariia Demianenko, Igor Chilingarian, Kirill Grishin +4
In this paper, we present an algorithm to correct optical light curves obtained using The Zwicky Transient Facility Forced Photometry Service and its application to the analysis of…