Publications (32)
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…
SDSS-V Local Volume Mapper (LVM): Helix Nebula public data, Data Analysis Pipeline data products
S. F. Sánchez, J. E. Méndez-Delgado, A. MejÃa-Narváez +21
We present a spatially resolved spectroscopic analysis of the Helix Nebula (NGC 7293) using data from the SDSS-V Local Volume Mapper (LVM), by applying the recently developed LVM D…
Peering into the heart of darkness with VLBA : Radio Quiet AGN in the JWST North Ecliptic Pole Time-Domain Field
Payaswini Saikia, Ramon Wrzosek, Joseph Gelfand +27
We present initial results from the 4.8 GHz Very Long Baseline Array (VLBA) survey of the JWST North Ecliptic Pole Time-Domain Field (TDF). From 106 radio sources found in the Karl…
Danger Zone: Establishing Buffers for Enhanced Classification in BPT Diagrams
Changhyun Cho, Ahmad Nemer, Ivan Yu. Katkov +1
This study utilizes unsupervised machine learning, specifically the uniform manifold approximation and projection (UMAP) algorithm, to classify optical spectra originating from sta…
Two interacting galaxies hiding as one, revealed by MaNGA
Barbara Mazzilli Ciraulo, Anne-Laure Melchior, Daniel Maschmann +5
Given their prominent role in galaxy evolution, it is of paramount importance to unveil galaxy interactions and merger events and to investigate the underlying mechanisms. The use…
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…
The imprint of the thick stellar disc in the mid-plane of three early-type edge-on galaxies in the Fornax cluster
Ivan Yu. Katkov, Alexei Yu. Kniazev, Anastasia V. Kasparova +1
Galactic stellar discs, such as that of the Milky Way, have usually a complex structure consisting of a thin and a thick component. The study of galactic disc substructures and the…
Stellar CoRGI in MaNGA: Stellar Counterrotating Galaxies Identified in the MaNGA Survey
Damir Gasymov, Ivan Yu. Katkov, Evgenii V. Rubtsov +8
Stellar counterrotating (CR) galaxies are systems hosting two large-scale stellar components rotating in opposite directions -- a main, preexisting galaxy body with an older stella…
SDSS-V LVM: Collisionless Shocks in the Supernova Remnant RCW86
Sumit K. Sarbadhicary, Knox S. Long, John C. Raymond +19
The supernova remnant (SNR) RCW86 is among the few SNRs with Balmer-emission lines containing broad and narrow spectral components that trace fast, non-radiative shocks in partiall…
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 Population of Bona Fide Intermediate Mass Black Holes Identified as Low Luminosity Active Galactic Nuclei
Igor V. Chilingarian, Ivan Yu. Katkov, Ivan Yu. Zolotukhin +4
Nearly every massive galaxy harbors a supermassive black hole (SMBH) in its nucleus. SMBH masses are millions to billions , and they correlate with properties of spheroi…
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…
Isolated lenticular galaxies: properties and evolution
Ivan Yu. Katkov
This work is dedicated to investigation of galaxies that do not fit into a common scenario of galaxy formation - isolated lenticular galaxies. We have studied stellar populations a…
There is no single density: star-forming regions and galaxies hold more dense ionized gas than long assumed
J. Eduardo Méndez-Delgado, Christophe Morisset, William J. Henney +29
Ionized gas fills star-forming regions and galaxies, and nearly everything we know about its temperature, pressure, mass, and composition is inferred from its emission lines [1-3].…
Multi-component parametric inversion of galaxy kinematics and stellar populations using full spectral fitting
Ivan Yu. Katkov, Igor V. Chilingarian
The stellar line-of-sight velocity distribution (LOSVD) can be strongly asymmetric in regions where the light contributions of both disc and bulge in spiral and lenticular galaxies…
An excessively massive thick disc of the enormous edge-on lenticular galaxy NGC7572
Anastasia V. Kasparova, Ivan Yu. Katkov, Igor V. Chilingarian
Galactic discs are known to have a complex multilayer structure. An in-depth study of the stellar population properties of the thin and thick components can elucidate the formation…
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…
The Diversity of Thick Galactic Discs
Anastasia V. Kasparova, Ivan Yu. Katkov, Igor V. Chilingarian +3
Although thick stellar discs are detected in nearly all edge-on disc galaxies, their formation scenarios still remain a matter of debate. Due to observational difficulties, there i…
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…
Determining the nature of IC 10 X-2: A comprehensive study of the Optical/Infrared emission from an extragalactic BeHMXB
Jwaher Alnaqbi, Joseph D. Gelfand, Payaswini Saikia +7
We present a comprehensive analysis of the optical and infrared (IR) properties of high-mass X-ray binary (HMXB) IC 10 X-2, classified as a super-giant HMXB and super-fast X-ray tr…
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…
An Accreting, Anomalously Low Mass Black Hole at the Center of Low Mass Galaxy IC 750
Ingyin Zaw, Michael J. Rosenthal, Ivan Yu. Katkov +5
We present a multi-wavelength study of the active galactic nucleus in the nearby ( Mpc) low mass galaxy IC 750, which has circumnuclear 22 GHz water maser emission. The mas…
The impact of low luminosity AGN on their host galaxies: A radio and optical investigation of the kpc-scale outflow in MaNGA 1-166919
Aisha Al Yazeedi, Ivan Yu. Katkov, Joseph D. Gelfand +3
One way an Active Galactic Nucleus (AGN) influences the evolution of their host galaxy is by generating a large-scale (kpc-scale) outflow. The content, energetics, and impact of su…
Kinematics And Stellar Population In Isolated Lenticular Galaxies
Ivan Yu. Katkov, Alexei Yu. Kniazev, Olga K. Sil'chenko
By combining new long-slit spectral data obtained with the Southern African Large Telescope (SALT) for 9 galaxies with previously published our observations for additional 12 galax…
Stars and ionized gas in S0 galaxy NGC 7743: an inclined large-scale gaseous disk
Ivan Yu. Katkov, Alexei V. Moiseev, Olga K. Sil'chenko
We used deep long-slit spectra and integral-field spectral data to study the stars and ionized gas kinematics and stellar population properties in the lenticular barred galaxy NGC…
Lenticular galaxy IC 719: current building of the counterrotating large-scale stellar disk
Ivan Yu. Katkov, Olga K. Sil'chenko, Victor L. Afanasiev
We have obtained and analyzed long-slit spectral data for the lenticular galaxy IC 719. In this gas-rich S0 galaxy, its large-scale gaseous disk counterrotates the global stellar d…
A new method for reconstructing the density distribution of matter in the disks of spiral galaxies from the rotation velocity curve in it
Alexander Shatskiy, Igor Novikov, Olga K. Sil'chenko +2
In this paper we propose a new method for reconstructing the surface density of matter in flat disks of spiral galaxies. The surface density is expressed through observational rota…
Long-period eclipsing binaries: towards the true mass-luminosity relation. I. The test sample, observations and data analysis
Alexei Yu. Kniazev, Oleg Yu. Malkov, Ivan Yu. Katkov +1
The mass-luminosity relation is a fundamental law of astrophysics. We have suggested that the currently used mass-luminosity relation is not correct for the M/M_sun > 2.7 range of…
Double-peak emission line galaxies in the SDSS catalogue. A minor merger sequence
Daniel Maschmann, Anne-Laure Melchior, Gary A. Mamon +2
Mergers can be detected as double-peak narrow emission line galaxies but they are difficult to disentangle from disc rotations and gas outflows. We aim to properly detect such gala…
A new sky subtraction technique for low surface brightness data
Ivan Yu. Katkov, Igor V. Chilingarian
We present a new approach to the sky subtraction for long-slit spectra suitable for low-surface brightness objects based on the controlled reconstruction of the night sky spectrum…
Reconstructing star formation histories of recently formed ultra-diffuse galaxies
Kirill A. Grishin, Igor V. Chilingarian, Anton V. Afanasiev +1
Observational studies of ultra-diffuse galaxies (UDGs) represent a significant challenge because of their very low surface brightnesses. A feasible approach is to identify "future"…
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…