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Astron. Astrophys. 321, 105-110 (1997)

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Radio spectra of Gigahertz Peaked Spectrum radio sources

W.H. de Vries 1, 2, P.D. Barthel 1 and C.P. O'Dea 2

1 Kapteyn Astronomical Institute, P.O.Box 800, 9700 AV Groningen, The Netherlands
2 Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA

Received 19 October 1995 / Accepted 18 October 1996


A well defined sample of 72 Gigahertz Peaked Spectrum radio sources is compiled, having turnover frequencies in the range of 0.5 - 10 GHz. Using this sample, the canonical GPS radio spectrum is constructed, which is found to have a constant shape, independent of AGN type, redshift or radio luminosity. A possible deficiency of low turnover frequencies at high redshift is found, which may reflect a physical mechanism where turnover frequency and radio luminosity are correlated.

Key words: galaxies: active – radio continuum: galaxies – quasars: general

Send offprint requests to: P.D. Barthel

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© European Southern Observatory (ESO) 1997

Online publication: June 30, 1998