Statistical Study of Central Radio Sources in Regions with the Sunyaev-Zeldovich Effect

Solovyov D. I., Verkhodanov O. V., Ulakhovich O. S., Verkhodanova N. V., Khabibullina M. L.

We investigate the statistical properties of radio sources from the WENSS catalog, in the direction to which the Sunyaev-Zeldovich (SZ) effect is detected in the multifrequency microwave maps of the Planck space mission. The continuous radio spectra of objects are constructed and the distributions of the spectral indices and the response of the cosmic microwave background (CMB) radiation in the region of radio sources are studied. Background objects are calculated in areas with SZ effect. We show that a negative response is predominantly observed in the CMB anisotropy map in the direction to the radio source with the SZ effect. A subsample of radio sources identified with objects of the Pan-STARRS optical survey is constructed. The statistical difference between the properties of the objects from the subsample and the complete list under study is shown. For radio sources with optical identification, the absolute value of the radio spectral index is lower on average, and the minimum of temperature anisotropy in the CMB map is deeper. The effect can be used to select candidates for distant galaxy clusters. Original →