157 citations · 461 across the 43 of their papers we have counts for
15 papers · 1 filter
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…
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…
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…
Fast interactive web-based data visualizer of panoramic spectroscopic surveys
Ivan Katkov, Damir Gasymov, Joseph D. Gelfand +7
Panoramic IFU spectroscopy is a core tool of modern observational astronomy and is especially important for galaxy physics. Many massive IFU surveys, such as SDSS MaNGA (10k target…
RCSEDv2: homogenization of multi-wavelength photometric data
Victoria Toptun, Igor Chilingarian, Ivan Katkov +6
RCSEDv2 (https://rcsed2.voxastro.org/), the second Reference Catalog of Spectral Energy Distributions of galaxies includes the largest homogeneously processed photometric dataset f…
RCSEDv2: Open-source web tools for visualization of imaging and spectral data
Vladislav Klochkov, Ivan Katkov, Igor Chilingarian +6
We present a set of open-source web tools for visualization of spectral and imaging data, which we use in the second Reference Catalogue of Spectral Energy Distributions of galaxie…
RCSEDv2: the largest database of galaxy properties from a homogeneously processed multi-wavelength dataset
Igor Chilingarian, Sviatoslav Borisov, Vladimir Goradzhanov +6
The Reference Catalog of Spectral Energy Distributions of 800,000 galaxies (RCSED) includes the results of uniform re-processing of 800,000 SDSS DR7 galaxies at redshifts $0.007<z<…
RCSEDv2: Processing and analysis of 4+ million galaxy spectra
Vladimir Goradzhanov, Igor Chilingarian, Evgenii Rubtsov +6
RCSEDv2 (https://rcsed2.voxastro.org/), the second Reference Catalog of Spectral Energy Distributions of galaxies, provides the largest homogeneously analyzed collection of optical…
RCSEDv2: analytic approximations of k-corrections for galaxies out to redshift
Anastasia Kasparova, Igor Chilingarian, Sviatoslav Borisov +6
To compare photometric properties of galaxies at different redshifts, we need to correct fluxes for the change of effective rest-frame wavelengths of filter bandpasses, called -…
Hybrid minimization algorithm for computationally expensive multi-dimensional fitting
Evgenii Rubtsov, Igor Chilingarian, Ivan Katkov +3
Multi-dimensional optimization is widely used in virtually all areas of modern astrophysics. However, it is often too computationally expensive to evaluate a model on-the-fly. Typi…
Observing, calibrating and reducing near-infrared imaging mosaics
Kirill Grishin, Igor Chilingarian
In near-infrared bands, co-adding and tiling of astronomical imaging datasets require a sufficiently high calibration quality (flat fielding, background subtraction). Here we prese…
Multi-segment and Echelle stellar spectra processing issues and how to solve them
Sviatoslav Borisov, Igor Chilingarian, Evgenii Rubtsov +7
High-quality stellar spectra are in great demand now - they are the most important ingredient in the stellar population synthesis to study galaxies and star clusters. Here we descr…
Estimating Statistical Uncertainties of Internal Kinematics of Galaxies and Star Clusters Derived Using Full Spectrum Fitting
Igor V. Chilingarian, Kirill A. Grishin
Pixel-space full spectrum fitting exploiting non-linear minimization became a \emph{de facto} standard way of deriving internal kinematics from absorption line spectra of gal…
The recalibration of the UVES-POP stellar spectral library
Svyatoslav Borisov, Igor Chilingarian, Eugene Rubtsov +3
We have re-reduced all spectra from the UVES-POP stellar spectral library using the version 5.5.7 of the UVES pipeline and an algorithm we designed, which allows us to remove rippl…