ИСТИНА

RCSEDv2 is the second version of the RCSED catalog (Chilingarian et al, 2017) – A Value-added Reference Catalog of Spectral Energy Distributions (https://rcsed2.voxastro.org/). It is based on spectral and photometric data for more than 4 million extragalactic sources collected from several publicly available spectral (SDSS, LAMOST, Hectospec, 2dF, etc.) and photometric (SDSS, UKIDSS, GALEX, WISE, etc.) all-sky surveys in a wide wavelength range. To analyze them, we used the NBursts full spectrum fitting technique developed by the authors (Chilingarian et al, 2007), with additional capabilities for analyzing emission lines. Analysis of such large samples of objects is only possible in automatic mode, for which procedures have been developed for detection, classification and selection of emission lines templates with several possible action scenarios. The properties of the stellar components (age and metallicity) were determined using stellar population models (PEGASE, MILES, X-SHOOTER, etc.). If emission lines were detected in the spectrum, the following scenarios were checked: a single set of lines, a set of narrow lines with a broad lines component (NLR+BLR) and a double set of narrow lines (DP/outflow). The emission lines profiles were described both parametrically and non-parametrically. From the resulting fluxes, gas properties (metallicity and ionization parameter) were assessed using the IZI procedure (Blanc et al, 2015). As a result, for a large number of extragalactic sources, we obtained a complete and homogeneous set of analysis results, which can be used for further statistical analysis and study of the evolution of galaxies.