30 research outputs found
Study of the Power Beam Pattern of RATAN-600 During the Deep RZF Survey (1998-2003)
This paper proposes a method for constructing an experimental power beam
pattern (PB) of RATAN-600 based on the sample of NVSS sources observed in the
process of a deep sky survey near local zenith. The data obtained from
observations of radio sources at wave 7.6 cm in nine bands of the survey (the
2002 and 2003 sets) are used to construct vertical PB of the telescope at
rather large offsets from the central horizontal section of the PB (+/-36').
The experimental PBs obtained using different methods are compared and the
root-mean-square deviations of the experimental PB from the corresponding
computed PB are determined. The stability of the power beam pattern in its
central part (+/-6') during the RATAN-600 Zenith Field (RZF) survey (1998-2003)
and the accuracies of the fluxes of the sources observed within the framework
of this survey and included into the RZF catalog are estimated.Comment: 15 pages, 17 figure
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
The KHOLOD Experiment: A Search for a New Population of Radio Sources
Published data from long-term observations of a strip of sky at declination
+5 degrees carried out at 7.6 cm on the RATAN-600 radio telescope are used to
estimate some statistical properties of radio sources. Limits on the
sensitivity of the survey due to noise imposed by background sources, which
dominates the radiometer sensitivity, are refined. The vast majority of noise
due to background sources is associated with known radio sources (for example,
from the NVSS with a detection threshold of 2.3 mJy) with normal steep spectra
({\alpha} = 0.7-0.8, S \propto {\nu}^{- \alpha}), which have also been detected
in new deep surveys at decimeter wavelengths. When all such objects are removed
from the observational data, this leaves another noise component that is
observed to be roughly identical in independent groups of observations. We
suggest this represents a new population of radio sources that are not present
in known catalogs at the 0.6 mJy level at 7.6 cm. The studied redshift
dependence of the number of steep-spectrum objects shows that the sensitivity
of our survey is sufficient to detect powerful FRII radio sources at any
redshift, right to the epoch of formation of the first galaxies. The inferred
new population is most likely associated with low-luminosity objects at
redshifts z < 1. In spite of the appearance of new means of carrying out direct
studies of distant galaxies, searches for objects with very high redshifts
among steep and ultra-steep spectrum radio sources remains an effective method
for studying the early Universe.Comment: 13 pages, 10 figure
Analysis of the RC catalog sample in the region overlapping with the regions of the FIRST and SDSS surveys: I. Identification of sources with the VLSS, TXS, NVSS, FIRST, and GB6 catalogs
Radio sources of the RC catalog produced in 1980--1985 at RATAN-600 radio
telescope based on a deep survey of a sky strip centered on the declination of
the SS 433 source are optically identified in the region overlapping with FIRST
and SDSS surveys (about 132 square degrees). The NVSS catalog was used as the
reference catalog for refining the coordinates of the radio sources. The
morphology is found for about 75% of the objects of the sample and the ratio of
single, double and multicomponent radio sources is computed based on FIRST
radio maps. The 74, 365, 1400, and 4850 MHz data of the VLSS, TXS, NVSS, FIRST,
and GB6 catalogs are used to analyze the shape of the spectra.Comment: 16 pages, 3 figure