34 research outputs found
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
radio sources was selected from the RATAN-600 catalogue. The FRII-structure has
been confirmed with VLA and preliminary optical identifications which come from
the 6 m-telescope. As the RATAN-600 flux limit at 3.9 GHz ( 10mJy) is
fainter than that of major surveys, the sample may have high- contents. This
is also suggested by the faint magnitudes in the Hubble diagram. The final aim
is to create a homogeneous sample of high- radio galaxies in a well defined
strip around the sky, with faint radio limit and subarcsecond morphology down
to .
We could confirm 16 identifications down to 24. Most of the
extended objects have multicomponent structures as expected from other surveys
of high-redshift radio galaxies. We found five unresolved objects even with a
subarcsecond seeing. Of the remaining six objects, three are extremely faint
and the other three have such a complex environment that further observations
are needed to confirm the optical identification.Comment: A&AS in pres
RC J1148+0455 identification: gravitational lens or group of galaxies ?
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 = -1.04. The optical image of this source obtained with 6m
telescope is analysed. The radio source center is situated in a group of 8
galaxies of about 24 in the R-filter. The possible explanations of the
complex structure of radio components are considered.Comment: 6 pages, 5 figures, uses psfig.sty. This was the poster as presented
on Gamow Memorial Internat. Conference GMIC'99 "Early Universe: Cosmological
Problems and Instrumental Technologies" in St.Petersburg, 23-27 Aug., 1999.
Submitted to Proceedings to be published in A&A Transaction
RATAN-600 7.6-cm Deep Sky Strip Surveys at the Declination of the SS433 Source During the 1980-1999 Period. Data Reduction and the Catalog of Radio Sources in the Right-Ascension Interval 7h < R.A. < 17h
We use two independent methods to reduce the data of the surveys made with
RATAN-600 radio telescope at 7.6 cm in 1988-1999 at the declination of the
SS433 source. We also reprocess the data of the "Cold" survey (1980-1981). The
resulting RCR (RATAN COLD REFINED) catalog contains the right ascensions and
fluxes of objects identified with those of the NVSS catalog in the
right-ascension interval 7h < R.A. < 17h. We obtain the spectra of the radio
sources and determine their spectral indices at 3.94 and 0.5 GHz. The spectra
are based on the data from all known catalogs available from the CATS, Vizier,
and NED databases, and the flux estimates inferred from the maps of the VLSS
and GB6 surveys. For 245 of the 550 objects of the RCR catalog the fluxes are
known at two frequencies only: 3.94 GHz (RCR) and 1.4 GHz (NVSS). These are
mostly sources with fluxes smaller than 30 mJy. About 65% of these sources have
flat or inverse spectra (alpha > -0.5). We analyze the reliability of the
results obtained for the entire list of objects and construct the histograms of
the spectral indices and fluxes of the sources. Our main conclusion is that all
10-15 mJy objects found in the considered right-ascension interval were already
included in the decimeter-wave catalogs.Comment: 26 pages, 18 figure