Abstract
The search for compact components of strong (\({{S}_{{{\text{int}}}}} \geqslant 5\) Jy at 102.5 MHz) discrete radio sources from the Pushchino catalogue was carried out using the method of interplanetary scintillation. A total of 3620 sources were examined, and 812 of them were found to harbor compact (scintillating) components. Estimates of fluctuations of the flux density of these compact components were derived from the scintillation index (\({{m}_{{\max}}}\)) corresponding to an elongation of 25°. The angular size and compactness of 178 sources with compact components were estimated. Scintillation indices of sources corresponding to the compact component (\({{m}_{0}}\)) and flux densities of compact components were determined. It was demonstrated that slow variations of the spatial distribution of interplanetary plasma, which are related to the 11-year cycle of solar activity, may exert a systematic influence on the estimates of angular sizes of sources. Coefficients compensating the deviation from the spherical symmetry of solar wind in the estimates of angular sizes were found using the coefficient of asymmetry of the statistical distribution of intensity fluctuations. The study of correlations between the parameters of sources in the sample revealed that the maximum value of the scintillation index decreases as the integrated flux increases, while the angular size has no marked dependence on the integrated flux.
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Funding
This study was supported by program no. KP19-270 “Issues of the Origin and Evolution of the Universe with Ground-Based Observations and Space Research” of the Presidium of the Russian Academy of Sciences.
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CATALOGUE OF COMPACT RADIO SOURCES
CATALOGUE OF COMPACT RADIO SOURCES
The designation of a source given in the Pushchino catalogue of discrete sources is indicated in the first column. The following parameters averaged over a 5‑year interval are listed in columns 2–6: maximum scintillation index (\({{m}_{{\max}}}\)), angular size of a source (\({{\theta }_{0}}\)), its compactness (fraction of energy in the compact component, \(x\)), observed flux-density fluctuations at the scintillation maximum (\(\Delta {{S}_{{\max}}}\)), and flux density of the compact component (\({{S}_{c}}\)) determined in accordance with (2). The integrated flux density (\({{S}_{{{\text{int}}}}}\)) recalculated from 102.5 to 110.3 MHz under the assumption that all the studied sources have a spectral index of 0.9 is given in the seventh column. A dash indicates that the angular size of a certain source could not be determined; other parameters requiring an angular size value to be determined are also not indicated for such sources.
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Tyul’bashev, S.A., Chashei, I.V., Subaev, I.A. et al. Study of Bright Compact Radio Sources of the Northern Hemisphere at 111 MHz. Astron. Rep. 64, 406–424 (2020). https://doi.org/10.1134/S1063772920060062
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DOI: https://doi.org/10.1134/S1063772920060062