PoS - Proceedings of Science
Volume 425 - The Multifaceted Universe: Theory and Observations - 2022 (MUTO2022) - Cosmology and physics of galaxies
Sources of the experiment "Cold" surveys in different ranges of the electromagnetic spectrum
O.P. Zhelenkova*, N.S. Soboleva, E.K. Majorova, A.V. Temirova and N.N. Bursov
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The study of the panchromatic properties of radio sources makes it possible to research the evolution of active galactic nuclei and their relationship with the environment. A study was made of a complete sample of radio sources in terms of flux density from surveys of the "Cold" experiment carried out on the RATAN-600 radio telescope at a frequency of 3.94 GHz in 1980–2000. We have found hosts for 95\% of these radio sources. According to radio luminosity estimates, most of the sources are powerful FRII type radio sources. Based on photometric data and color indices, among the hosts, we have identified groups of quasars, early-type galaxies, and late-type galaxies. Additionally, early-type galaxies are subdivided into a smaller group with a relatively low radio loudness index and a large group with a high index.

For the sources, a comparison was made of the absolute magnitude and radio luminosity, their ratios, and the number of quasars and the number of galaxies were calculated depending on the radio luminosity. Correlations are found, the behavior of which can be explained by a change in the geometry of the dust torus, i.e. the screening properties of the torus decrease with increasing radio luminosity.

Long-term variability was found with varying degrees of confidence in 18\% of the radio sources. The hosts of these sources with magnitude R$\leq$18$^m$ exhibit variability in the optical range as well.

According to the multi-frequency maps of the Planck mission, for 70\% of the sources of the RCR catalog, at a level $\lesssim$4$\sigma$, a positive signal was found at least at one frequency. Spectral studies confirm the connection of these positive spots with radio sources.
To search for the Sunyaev-Zel'dovich (SZ) effect, studies of the properties of "hot" and "cold" spots near sources were carried out. 16\% of radio sources have signs of the SZ-effect at level $\lesssim$4$\sigma$. One fifth of them are in the catalogs of galaxy clusters, which confirms the applicability of our technique for searching for the effect in faint sources.
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