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Paper: Photometrical Study of Radio Galaxies in RATAN-600 "Cold" survey
Volume: 284, AGN Surveys, IAU Colloquium 184
Page: 310
Authors: Verkhodanov, O. V.; Parijskij, Yurij N.; Soboleva, Natalia S.; Kopylov, Alexander I.; Temirova, Adelina V.; Zhelenkova, Olga P.; Goss, W. M.
Abstract: We use the RATAN-600 radio telescope for picking up distant radio galaxies. About 100 ultra steep spectrum FRII radio galaxies from the RATAN-600 RC-catalog (Parijskij et al., 1991) were mapped by the VLA and identified with optical objects down to 24-25 R mag. by 6m Russian telescope. An updated list of calibrators with the known redshifts of the same class RGs was compiled to estimate photometric redshifts. The mean redshift of the RC USS FRII RG list happened to be > 1. BVRI photometry was made, and by standard model fittings we estimated color redshifts and the ages of stellar systems of the parent gE galaxies. Several objects were found in which active star formation began in the first billion years after the Big Bang.
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