The study is about the quasars cosmological evolution. We used the medium-band photometric survey at the 1-m Schmidt telescope of the Byurakan Astrophysical Observatory. The HS47-22 field with an area of 2.38 square degrees has been selected. We have classified objects and composed a sample of quasars using broadband photometric data and morphological classification from the DECaLS survey, infrared photometry from the WISE survey, spectroscopy from the SDSS survey, ROSAT X-ray data, FIRST radio data and stellar parallax data from the GAIA survey. We have compiled a sample of 682 quasars, determined their photometric redshifts from the medium-band photometric data, and calculated the absolute stellar magnitudes. The space density of quasars was calculated for different luminosity ranges at different redshifts using the λ-CDM model with Ωm=0.3 and Ωλ=0.7. In this paper, we present the comparison of our results with other works.
@article{arxiv.2203.02287,
title = {Quasars physical properties study based on the medium-band photometric survey},
author = {Sergey Kotov and Sergey Dodonov and Aleksandra Grokhovskaya},
journal= {arXiv preprint arXiv:2203.02287},
year = {2022}
}