========================================================================== VIII/80 The UTR-2 Very Low-Frequency Sky Survey Data (Braude+ 1978-2002) The following files can be converted to FITS (extension .fit .fgz or .fiZ) mean.dat data.dat ========================================================================== Query from: http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=VIII/80 ==========================================================================
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Beginning of ReadMe : VIII/80 The UTR-2 Very Low-Frequency Sky Survey Data (Braude+ 1978-2002) ================================================================================ The UTR-2 Very Low-Frequency Sky Survey Data Decametric survey of discrete sources in the northern sky. II. Source catalogue in the range of declinations +10 to +20 Braude S.Ya., Megn A.V., Rashokovski S.L., Ryabov B.P., Sharykin N.K., Sokolov K.P., Tkatchenko A.P., Zhouk I.N. <Astrophys. Space Sci., 54, 37 (1978)> =1978Ap&SS..54...37B Decametric survey of discrete sources in the northern sky. V. Source catalogue in the range of declinations 0 to +10. Braude S.Ya., Megn A.V., Sokolov K.P., Tkatchenko A.P., Sharykin N.K. <Astrophys. Space Sci., 64, 73 (1979)> =1979Ap&SS..64...73B Decametric survey of discrete sources. VII. Source catalogue in the range of declination -2 to -13. Braude S.Ya., Miroshnitchenko A.P., Sokolov K.P., Sharykin N.K. <Astrophys. Space Sci., 74, 409 (1981)> =1981Ap&SS..74..409B Decametric survey of discrete sources in the northern sky. IX. Source catalogue in the declination range 52 to 60. Braude S.Ya., Sharykin N.K., Sokolov K.P., Zakcharenko S.M. <Astrophys. Space Sci., 111, 1 (1985)> =1985Ap&SS.111....1B Decametric survey of discrete sources in the northern sky. XI. The results of the UTR-2 very low-frequency sky survey in the declination range 41 deg. to 52 Braude S.Ya., Sokolov K.P., Zakcharenko S.M. <Astrophys. Space Sci., 213, 1 (1994)> =1994Ap&SS.213....1B Decametric survey of discrete sources in the northern sky. XIIIa. The catalogue of sources in declination range +30deg. to +40deg. Braude S.Y., Rashkovsky S.L., Sidorchuk K.M., Sidorchuk M.A., Sokolov K.P., Sharykin N.K., Zakharenko S.M. <Astrophys. Space Sci., 280, 235 (2002)> =2002Ap&SS.280..235B ================================================================================ ADC_Keywords: Radio sources Description: 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 -13deg to -2deg, 0deg to 20deg, 30deg to 40deg, and 41deg to 60deg. 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.