The UTR-2 Very Low-Frequency Sky Survey Data (Braude+ 1978-1982)

Details The UTR-2 Very Low-Frequency Sky Survey Data (Braude+ 1978-1982) The UTR-2 Very Low-Frequency Sky Survey Data (Braude+ 1978-1982)

Sep 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997ycat.8041....0b&link_type=abstract

VizieR On-line Data Catalog: VIII/41. Originally published in: 1978Ap&SS..54...37B; 1979Ap&SS..64...73B; 1981Ap&SS..74..409B; 1

Astronomy and Astrophysics

Astronomy

2

Radio Sources

Scientific paper

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° to -2°, 0° to 20°, and 41° to 60°. 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. (2 data files).

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