A VLBI survey of peaked spectrum radio sources

Details A VLBI survey of peaked spectrum radio sources A VLBI survey of peaked spectrum radio sources

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984aj.....89.1327h&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 89, Sept. 1984, p. 1327-1331.

Astronomy and Astrophysics

Astronomy

48

Astronomical Spectroscopy, Radio Sources (Astronomy), Spectral Energy Distribution, Very Long Base Interferometry, Self Absorption, Synchrotron Radiation

Scientific paper

VLBI array observations of nine previously unmapped compact radio sources were made at 1.6 GHz. The sources were chosen on the basis of their spectra, which are peaked between 1.0 and 3.0 GHz and are steep at high frequencies. The measured angular sizes are consistent with the spectral turnovers being due to synchrotron self-absorption. None of the sources had widely spaced symmetrical double structure. This is surprising, since nearly all known compact double sources have similar spectral properties. The authors conclude that sources with a compact double morphology constitute a relatively small fraction of all steep-spectrum compact sources with peaked spectra.

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