Abstract
Millimeter- and submillimeter-wave maps are used to select potential candidate objects with the Sunyaev–Zeldovich effect in the vicinity of RCR (RATAN Cold Refined) radio sources. The properties of “hot” and “cold” spots in the right-ascension interval 2h ≤ RA ≤ 17h and the declination strip \({\text{De}}{{{\text{c}}}_{{2000}}} = 45^\circ .9' \pm 15'\) are studied. In the entire strip a total of 135 candidate objects with the Sunyaev–Zeldovich effect are found. A total of 86 objects are located within 7′ from RCR catalog sources. The effect shows up most conspicuously in the vicinity of 25 RCR sources. Clusters of galaxies or radio sources are found near the overwhelming majority of spots with the Sunyaev–Zeldovich effect. The distributions of radio spectral indices of the objects and the signal on microwave maps in the direction of radio sources are statistically analyzed. It is shown that when observed at microwave frequencies a number of objects are associated with sources with inverted spectra.
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Notes
Hereinafter, we will call them “hot spots.”
http://www.rssd.esa.int/Planck/.
http://pla.esac.esa.int/.
When constructing the radio source spectra we used all available flux information available via CATS (Verkhodanov et al., 2005b), Vizier (Ochsenbein et al., 2000) and NED (NASA/IPAC Extragalactic Database resources).
The median spectral indices at 3.94 GHz are equal to Sp.Ind.3.94 = –0.77 and Sp.Ind.3.94 = –1.12 for the sources of the SS and USS groups, respectively. The fractions of SS and USS sources were found to be equal to 52% and 14% of all objects, respectively.
The most distant radio galaxy and quasar among RCR sources have the redshifts of z = 4.514 (Kopylov et al., 2006) and z = 3.345, respectively.
http://www.glesp.nbi.dk.
A spot at 100 GHz must be “colder” than a spot at 143 Ghz.
The full Table 1 is available at: http://www.sao.ru/hq/len/Cluster/Tabl_1/.
The amplitudes of most of the spots that we investigate on Planck maps do not exceed 4σ.
Its z-band magnitude is mz = 23.2, and this galaxy is not observed in other optical bands (the data of the NOAO Legasy Survey).
The sources for which no redshift z is listed are faint optical objects and in some cases the optical object cannot be detected at all.
They are marked by letters Pl in Table 1 (column (11)).
The full Table 2 is available at: http://www.sao.ru/hq/len/Cluster/Tabl_2/.
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ACKNOWLEDGMENTS
We are grateful to European Space Agency for providing open access to the results of observations and data reduction in Planck Legacy Archive. We used the CATS database of astronomical catalogs (Verkhodanov et al., 2005b, 2009) when reconstructing the radio spectra. This study also used the FADPS system for the processing of radio-astronomical data and GLESP scheme for analyzing extended radiation on the sphere.
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Majorova, E.K., Verkhodanov, O.V. & Zhelenkova, O.P. Search for Candidate Objects with the Sunyaev–Zeldovich Effect on Planck Maps in the Neighborhood of RCR Catalog Radio Sources. Astrophys. Bull. 75, 77–92 (2020). https://doi.org/10.1134/S1990341320020091
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DOI: https://doi.org/10.1134/S1990341320020091