Completion of the optical identification of RC catalog objects with ultra steep spectra and estimation of their redshifts

Details Completion of the optical identification of RC catalog objects with ultra steep spectra and estimation of their redshifts Completion of the optical identification of RC catalog objects with ultra steep spectra and estimation of their redshifts

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998arep...42..425p&link_type=abstract

Astronomy Reports, Volume 42, Issue 4, July 1998, pp.425-438

Astronomy and Astrophysics

Astronomy

4

Scientific paper

The results of optical identification of the third subsample of RC catalog objects with ultra steep spectra (USS) using the 6-m telescope of the Special Astrophysical Observatory are presented. These objects were discovered in the KHOLOD-80 (`Cold-80') experiment on the RATAN-600 radio telescope, and subsequently studied using the Very Large Array to obtain refined coordinates and morphological classifications (the `Big Trio' project). USS sources make up about 10% of the total number of RC objects (1145 sources in an area of about 100 square degrees). More than 70% of the USS sources have properties corresponding to powerful FRII radio galaxies, making them suitable for investigations of the early Universe. All available information for such objects (232 USS sources with Z > 1) are used to construct the redshift dependences of the visual magnitude Z(R) largest angular size Z(LAS), and spectral index Z(alpha); these distributions are then used to estimate the redshifts of the USS sources in our sample with accuracy to about 30%. The mean redshift obtained using various methods is two; the mean redshift for bright objects is about one. Maximum possible redshift values are also estimated. The sample sources are separated into compact steep spectrum sources, whose radio dimensions are smaller than the sizes of their optical host galaxies, objects with anomalously large angular sizes at large photometric redshifts, objects with powerful nuclear radio emission, and so on. The 32 best candidates for very distant galaxies are identified for subsequent deep spectroscopic investigations. Five objects with large photometric redshifts are located in groups of galaxies, which could be poor groups or the brightest members of distant clusters.

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