Metre-wavelength fine structure in 30 extragalactic radio sources with sizes of a few arcsec

Astronomy and Astrophysics – Astronomy

Scientific paper

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Extragalactic Radio Sources, Radio Astronomy, Scintillation, Very Long Base Interferometry, Evolution (Development), Interplanetary Medium, Radiant Flux Density, Size (Dimensions)

Scientific paper

Interplanetary scientillation (IPS) observations at 327 MHz of an unbiased sample of 30 extragalactic radio sources having overall sizes between 1 and 4 arcsec, and flux densities greater than 1 Jy at 327 MHz are reported. From VLBI observations, these sources have been reported to contain compact components of sizes not more than about 0.02 arcsec contributing on an average about 25 per cent of the total emission at 5 GHz. The IPs observations show that about 45 per cent of the total emission at 327 MHz arises from structures of sizes between 0.05 and 0.5 arcsec (corresponding typically to 0.5 to 5 kpc). A comparison of the VLBI and IPS results indicates that the VLBI anad IPS components probably refer to the same physical features in these sources; and that these features are probably either hotspots or steep-spectrum kiloparsec cores for about two-thirds of the sources and may be flat-spectrum compact components for the rest.

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