Abstract
Interplanetary scintillating (IPS) radio sources from the Pushchino Survey (PS) in the area of 0.11 sr have been cross-identified with objects from the 7C and FIRST catalogues. We have obtained improved positions of IPS radio sources, which are necessary for their optical identification. The data on sizes and morphology provided by the FIRST catalogue have shown that more than 50% of IPS radio sources are single and compact (<3 00 )a t= 1400 MHz. Most of them belong to the class of compact steep spectrum radio sources. About 15% of IPS radio sources are single partially resolved FIRST objects (sizes of 3 00 9 00 ) and another 11% are double radio sources with compact components. The remaining 22% have larger sizes and, as a rule, a more complex structure too. Because IPS sources certainly contain an appreciable part of their radiation at low frequencies (100 MHz) in very compact (0: 00 1) components and have steep spectra, we hope that a significant part of the
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