Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.257..353m&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 257, no. 2, July 15, 1992, p. 353-367.
Astronomy and Astrophysics
Astronomy
30
Astronomical Spectroscopy, Radio Galaxies, Variability, Astronomical Models, Low Frequencies, Radio Emission, Very Large Array (Vla)
Scientific paper
VLA 5-GHz and MERLIN 408-MHz observations of a sample of steep-spectrum low-frequency-variable sources are presented. 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 arcsec-scale structure allows separating them into two classes, namely sources with an unresolved component and lobe-dominated sources. All but three sources show the existence of compact (subarcsec) 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.
Browne Ian W. A.
Fanti Roberto
Junor William
Mantovani Fabio
Muxlow Thomas W. B.
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