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

Radio spectra of Gigahertz Peaked Spectrum radio sources

W.H. de Vries ^{1, 2}, P.D. Barthel ¹ and C.P. O'Dea <sup>2

1</sup> 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

Abstract

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

SIMBAD Objects

Contents

• 1. Introduction
• 2. Sample and selection
• 3. Sample properties
  • 3.1. Canonical radio spectrum
  • 3.2. Turnover frequency vs. radio luminosity
  • 3.3. Angular sizes
  • 3.4. Physical sizes
• 4. Summary and conclusions
• Acknowledgements
• References

© European Southern Observatory (ESO) 1997

Online publication: June 30, 1998
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