Volume 382, Number 1, JanuaryIV 2002
|Page(s)||53 - 59|
|Section||Cosmology (including clusters of galaxies)|
|Published online||15 January 2002|
Optical identifications of High Frequency Peakers*
Dipartimento di Astronomia, Università degli Studi, via Ranzani 1, 40127 Bologna, Italy
2 Istituto di Radioastronomia – CNR, via Gobetti 101, 40129 Bologna, Italy
3 Osservatorio Astronomico, Vicolo dell'Osservatorio 5, 35122 Padova, Italy
4 Istituto di Radioastronomia – CNR, C.P. 141, 96017 Noto (SR), Italy
Corresponding author: D. Dallacasa, firstname.lastname@example.org
Accepted: 8 November 2001
We present CCD observations of 13 objects from a complete sample of 55 bright High Frequency Peaker (HFP) radio sources, and provide optical identification for 12 of them. Images in R and V filters have been used to derive some additional information concerning the host of the radio source. Three hosts are likely to be galaxies, one resulted slightly extended, while the remaining 8 are likely distant quasars. Based on these identifications and those available in the literature, we find that the fraction of quasars in our HFP sample is significantly higher than in samples of Compact Steep-Spectrum and GHz-Peaked Spectrum radio sources.
Key words: galaxies: active / radio continuum: galaxies / quasars: general
Based on observations made with the Italian Telescopio Nazionale Galileo (TNG) operated on the island of La Palma by the Centro Galileo Galilei of the CNAA (Consorzio Nazionale per l'Astronomia e l'Astrofisica) at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias.
© ESO, 2002
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