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.

中文翻译：

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北半球111 MHz明亮紧凑型无线电源的研究

摘要

使用该方法从Pushchino目录中搜索了强（\（{{S} _ {{{\ text {int}}}} \ geqslant 5 \） Jy在102.5 MHz上的离散无线电源的紧凑组件行星际闪烁。总共检查了3620个源，发现其中812个源包含紧凑（闪烁）成分。这些紧凑组件的通量密度波动的估计是从对应于25°伸长率的闪烁指数（\（{{m} _ {{\ max}}} \）得出的。估计了具有紧凑组件的178个光源的角度大小和紧凑性。与压缩分量（\（{{m} _ {0}} \）相对应的源的闪烁索引）和紧凑型组件的通量密度。结果表明，行星际等离子体空间分布的缓慢变化与太阳活动的11年周期有关，可能会对源角大小的估算产生系统性的影响。使用强度波动的统计分布的不对称系数，找到了角度大小估计中补偿太阳风的球形对称性偏差的系数。样品中源参数之间的相关性研究表明，闪烁指数的最大值随着积分通量的增加而减小，而角度大小对积分通量没有明显的依赖性。