The UTR-2 Very Low-Frequency Sky Survey Data Virtual Observatory Resource

Authors
  1. Braude S.Ya.
  2. Megn A.V.
  3. Rashokovski S.L.
  4. Ryabov B.P.
  5. Sharykin N.K.,Sokolov K.P.
  6. Tkatchenko A.P.
  7. Zhouk I.N.
  8. Published by
    CDS
Abstract

The results of the very-low frequency (16.7MHz) survey of discrete sources made with the UTR-2 radio telescope is presented. The survey concerns the declination zones -13{deg} to -2{deg}, 0{deg} to 20{deg}, 30{deg} to 40{deg}, and 41{deg} to 60{deg}. The UTR-2 radio source catalogue contains an estimate of the coordinates and flux densities of 1819 sources measured at a number of the lowest frequencies used in contemporary radio astronomy within the range from 10 to 25 MHz. The catalogue is made of two parts: mean.dat: the averaged values of the coordinates and the corresponding errors, the source flux-density at the middle UTR-2 frequency 16.7 MHz as obtained from measured spectrum of the source at all UTR-2 frequencies and its error, the value of measured low-frequency spectral index with respect to which the estimate of has been obtained, the parameter W characterizing the integral reliability of the obtained source estimates and the corresponding object name from higher-frequency radio survey provided the source has been identified. To indicate the integral readability of the source parameters obtained we used the symbols A, B and C. These reliability estimates take into account the total number of measurements, coordinate scatter, number of frequencies and hour-angle settings at which the source parameters have been evaluated. The highly reliable observation results have been marked with symbol A . The sources whose parameters can be used without an additional analysis are marked with B and sources whose parameters are to be used with care have been marked with C. data.dat: this file contains the experimental estimates of the source coordinates and flux densities as well as their errors at each operating frequency of the UTR-2 in the order of their increasing; the total number (N) of successive observations according to which the estimates were obtained and the number of different hour-angle settings (NRA) of the reception pattern at which the source was observed. In cases when the observations did not allow us to obtain a reliable estimates of a source flux density the catalogue contains only their upper limits which are not accompanied by errors. The approximated values of as well as low-frequency spectral indices are presented only for those sources which have flux density estimates obtained at not less than three different UTR-2 frequencies.

Keywords
  1. Radio sources
Bibliographic source Bibcode
1978Ap&SS..54...37B
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/VIII/80
IVOA Identifier IVOID
ivo://CDS.VizieR/VIII/80

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=VIII/80
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=VIII/80
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=VIII/80
IVOA Table Access TAP
http://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
http://vizier.cds.unistra.fr/viz-bin/conesearch/VIII/80/mean?
https://vizier.iucaa.in/viz-bin/conesearch/VIII/80/mean?
http://vizieridia.saao.ac.za/viz-bin/conesearch/VIII/80/mean?
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
http://vizier.cds.unistra.fr/viz-bin/conesearch/VIII/80/data?
https://vizier.iucaa.in/viz-bin/conesearch/VIII/80/data?
http://vizieridia.saao.ac.za/viz-bin/conesearch/VIII/80/data?

History

2007-06-30T09:20:19Z
Resource record created
2007-06-30T09:20:19Z
Created
2007-06-30T09:23:00Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr