The catalogue of sources for the flight program «Radioastron»

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Astronomy and Astrophysics
1Volvach, AE
1Laboratory of Radio Astronomy, SRI Crimean Astrophysical Observatory, Katsiveli, AR Crimea, Ukraine
Kosm. nauka tehnol. 2009, 15 ;(6):28-43
https://doi.org/10.15407/knit2009.06.028
Publication Language: Russian
Abstract: 
Observations of a sample of sources from the preliminary «Radioastron» catalogue were performed at 22.2 and 36.8 GHz with the RT-22 radio telescope of the Crimean Astro-physical Observatory. We determined the distribution of the source spectral indices between these frequencies. The distribution has a greater dispersion than in the WMAP catalogue for frequencies 23 and 33 GHz due to input parameters of the sample of the sources of the «Radioastron» catalogue. We plotted the log(10ΔN/N0) ‒ logS dependence down to flux levels of about 0.1 Jy using the survey data for near 22 GHz where some reduction in the density of cosmological sources in relation to not evolving Euclidean universe is observed. The variability of individual sources in connection with flare activity is considered.
Keywords: dispersion, frequencies, spectral indices
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