Compact radio sources in the GB/GB2 sample. I - 10-GHz and 40-GHz observations

Details Compact radio sources in the GB/GB2 sample. I - 10-GHz and 40-GHz observations Compact radio sources in the GB/GB2 sample. I - 10-GHz and 40-GHz observations

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.243..209m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 243, March 15, 1990, p. 209-218.

Astronomy and Astrophysics

Astronomy

5

Astronomical Spectroscopy, Radio Astronomy, Radio Sources (Astronomy), Flux Density, Radio Telescopes, Very Large Array (Vla), Very Long Base Interferometry, Visible Spectrum

Scientific paper

A complete subsample of compact radio sources selected from the flux-density-limited GB/GB2 sample has been observed at 10 and 40 GHz with the NRO 45-m radiotelescope. The resulting high-frequency spectra, together with existing data for these sources, enables us to distinguish different morphological types, i.e., flat-spectrum core-dominated sources, possible strongly projected lobe-dominated doubles and steep-spectrum compact (SSC) sources. Correlations between spectrum, visibility function, structure and optical type are analyzed and discussed. SSC sources constitute about 5-8 percent of the complete (compact + extended) GB/GB2 sample. The SSC phenomenon is evidently unrelated to optical identification of the sources. About 85 percent of the sample consist of sources with projected linear sizes of about 1-10 kpc. The remaining 15 percent are probably very compact sources with sizes from 1 kpc to tenths of a parsec. They are characterized by a self-absorbed 'humped' spectrum, and are candidates for future VLBA or VLBI observations.

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