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Date and Time of the Query: 2019-08-18 T07:18:34 PDT
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For refcode 2008A&A...489...49V:
Retrieve 219 NED objects in this reference.
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2008A&A...489...49V Quasi-simultaneous multi-frequency observations of inverted-spectrum GPS candidate sources Vollmer, B.; Krichbaum, T. P.; Angelakis, E.; Kovalev, Y. Y. Abstract. Context: Gigahertz-Peaked Spectrum (GPS) sources are likely the precursors of local radio galaxies. Existing GPS source samples are small (<200). Aims: We aim to extend the available sample of the Gigahertz-Peaked Spectrum (GPS) and High Frequency Peaker (HFP) sources in order to study their nature with greater detail and higher statistical significance. Methods: A sample of 214 radio sources, which were extracted from the SPECFIND catalog and show an inverted radio spectrum, were observed quasi-simultaneously at 4.85, 10.45, and 32 GHz with the 100-m Effelsberg radio telescope. Using the VLBA calibrator survey (VCS) we have investigated the parsec-scale morphology of the sources. Results: About 45% of the sources in our sample are classified as GPS or HFP candidates. We add 65 new GPS/HFP candidates to existing samples. We confirm the expected tendency that HFP are more compact on a milliarcsecond scale than the "classical" GPS sources, which peak at lower frequencies. Conclusions: The data mining of the SPECFIND database represents a promising tool for the discovery of new GPS/HFP sources. Key words: radio continuum: galaxies
Retrieve 219 NED objects in this reference.
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