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For refcode 1992MNRAS.257..353M:
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Copyright by Royal Astronomical Society. 1992MNRAS.257..353M Observations at arcsecond resolution of steep-spectrum sources which vary at low frequencies F. Mantovani, W. Junor, R. Fanti, L. Padrielli, I. W. A. Browne and T. W. B. Muxlow Istituto di Radioastronomia del CNR, Via Irnerio 46,I-40126 Bologna, Italy National Radio Astronomy Observatory, PO Box 0, Socorro, NM 87801-0387 USA Dipartmento di Fisica, Universita degli Studi, Via Irnerio 46,I-40126, Bologna, Italy Nufflell Radio Astronomy Laboratories, Jodrell Bank, Macclesfleld, Cheshire SK11 9DL Accepted 1992 February 2. Received 1992 January 31; in original form 1991 December 12 SUMMARY We present VLA 5-GHz and MERLIN 408-MHz observations of a sample of steep-spectrum low-frequency-variable sources. The radio observations show that the vast majority of sources have linear sizes typical of the compact steep spectrum sources. A classification based on their arcsecond-scale structure allows us to separate them into two classes, namely sources with an unresolved component and lobe-dominated sources. All but three sources show the existence of compact (subarcsecond) components which are required by models which explain the source variability as due to propagation effects in the interstellar medium. There are indications that the hotspots are the origin of the variability in lobe-dominated sources. Key words: radiative transfer - interstellar medium: general - radio continuum: galaxies.
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