ANALYSIS OF THE UPDATE SAMPLE OF USS OBJECTS AND SEARCH OF CANDIDATES TO GPS SOURCES IN THE RZF SURVEY
Аннотация и ключевые слова
Аннотация (русский):
A deep RATAN-600 Zenith Field (RZF) survey at wavelength λ = 7.6 cm on the declination of the 3C84 radio source. In the center of the survey region, 448 objects were detected, and 73 of them have ultra-steep spectra (USS), which are the main indicator for finding possible candidates for distant galaxies. Optical identifications for 31 of the USS objects were made using the SDSS surveys have been used. It turns out that 23 objects are galaxies and 8 are star-forming objects. Photometric redshifts (zph) and radio luminosities at 3.9 and 1.4 GHz (L3.9 and L1.4) are determined for 31 objects with spectral indices α<1.1, Sννα for objects with published photometric data. In the sample of USS objects, 15 galaxies have zph<0.5, and 8 of them have relatively high L1.4>1026 W/Hz of type FR II. Seven galaxies at zph>0.5 are also of type FR II. Five sources are of intermediate type FR I-FR II. Only three radio galaxies at zph<0.5 turned out to be a rare nearby galaxy with relatively low L1.4<1025 W/Hz (FR I). These radio sources are either located in the dense intergalactic medium of rich clusters or are confined within their host galaxies. Almost all of these sources can be observed with the SAO 6-m telescope. Galaxies with L1.4>1026 W/Hz (FR II) have magnitudes $18
Ключевые слова:
surveys; radio continuum: general; radio continuum: galaxies; galaxies: active
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