A. I. Kopylov

Optical morphology of distant RATAN-600 radio galaxies from subarcsecond resolution NOT images

We present direct imaging data of 22 ultra steep spectrum radio sources obtained at (or near) a subarcsecond seeing. The basic sample of 40 double ra- dio sources was selected from the RATAN-600 catalogue. The FRII-structure has been conrmed with VLA and preliminary optical identications which come from the 6 m-telescope. As the RATAN-600 flux limit at 3.9 GHz ( 10 mJy) is fainter than that of major surveys, the sam- ple may have high-z contents. This is also suggested by the faint magnitudes in the Hubble diagram. The nal aim is to create a homogeneous sample of high-z radio galaxies in a well dened strip around the sky, with faint radio limit and subarcsecond morphology down to mR = 24. We could conrm 16 identications down to mR 24. Most of the extended objects have multicomponent struc- tures as expected from other surveys of high-redshift ra- dio galaxies. We found ve unresolved objects even with a subarcsecond seeing. Of the remaining six objects, three are extremely faint and the other three have such a com- plex environment that further observations are needed to conrm the optical identication.

The program of distant radio galaxies at the special astrophysical observatory of Russia

Abstract The results of optical identification of a sample of ultra steep spectra (USS) RC-catalogue objects with the help of the 6-m Russian telescope are given. The objects were found in the RATAN-600 “Experiment Cold” and investigated with the VLA for morphology and accurate radio positions (“The Big Trio Project”). The USS sources make up about 10% of all of the 1145 RC-catalogue sources in an area of about 100 square degrees. More than 70% of these USS sources have FR II morphology and can be used for investigations of the early universe. With the help of accumulated information on 232 USS sources with Z > 1 the relations R(Z) (R-visual magnitude), LAS(Z) (LAS-the largest angular size) and spectral index α(Z) were constructed and the mean red shift of our sample sources turns out to be 2. All sources of our sample were separated into groups: compact steep spectra (CSS) with radio dimensions smaller than the size of the optical galaxy, sources with largest angular sizes, sources with bright nucleus, a...

RC J1148+0455 identification: Gravitational lens or group of galaxies?

Abstract The structure of the radio source RC B1146+052 of the ‘Cold’ catalogue is investigated by data of the MIT-GB-VLA survey at 4850 MHz. This source belongs to the steep spectrum radio sources subsample of the RC catalogue. Its spectral index is α = -1.04. The optical image of this source obtained with the 6 m telescope is analysed. The possible explanations of the complex structure of the radio components are considered.

RATAN-600 and the early Universe

Abstract We discuss the status of the Russian-USA “the Big Trio” project, based on the steep spectra (SS) FRII RG method of the selection of old and distant galaxies. Some aspects of the integral efforts of high redshift radio galaxies (HZRG) groups and Cosmic Microwave Background (CMB) anisotropy project briefly discussed, and new generation “Sakcharov Oscillation” national project at RATAN-600 shortly mentioned.

RC J0311+0507: A Candidate to Superpowerful Radio Galaxies with z = 4.514

The investigations of the ultra steep spectrum radio source RC J0311+0507 (4C+04.11) in radio (RATAN-600, VLA) and optics (6-m telescope SAO RAS) are presented. The identification of a strong line at 6703 A with Lyα gives a redshift z=4.514. The object belongs to the group of extremely distant radio galaxies of ultrahigh radio luminosity ( P 1400 = 1.3 × 10 29 WHz −1 ).

System to Estimate Ages and Redshifts for Radio Galaxies

The system allowing a user to operate with simulated curves of spectral energy distribution (SED) and to estimate ages and redshifts by photometric data at server {\bf this http URL} is described.

Photometric Study of Radio Galaxies in the RATAN-600 “Cold” Survey

About 100 steep spectrum radio sources from the RATAN--600 RC catalog were mapped by the VLA and identified with optical objects down to 24

BVRI-Photometry of Distant Radio Galaxies from RC Catalogue in SAO RAS

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Observations of the z = 4.514 radio galaxy RC J0311+0507

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VV124 (UGC4879): a new transitional dwarf galaxy in the periphery of the Local Group

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