The Parkes quarter-Jansky flat-spectrum sample. I. Sample selection and source identifications

Details The Parkes quarter-Jansky flat-spectrum sample. I. Sample selection and source identifications The Parkes quarter-Jansky flat-spectrum sample. I. Sample selection and source identifications

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...386...97j&link_type=abstract

Astronomy and Astrophysics, v.386, p.97-113 (2002)

Astronomy and Astrophysics

Astrophysics

47

Catalogues, Radio Continuum: Galaxies, Bl Lac Objects: General, Galaxies: General, Quasars: General

Scientific paper

We present a new sample of quarter-Jansky flat-spectrum radio sources selected to search for high-redshift quasars and to study the evolution of the flat-spectrum quasar population. The sample comprises 878 radio sources selected from the Parkes catalogues with spectral indices alpha 5 GHz_2.7 GHz >=-0.4 where Snu ~ nu alpha . The sample covers all right ascensions and the declination range from -80fdg0 to +2fdg5 , excluding low galactic latitudes (mid b mid < 10deg) and the Magellanic Cloud regions. We have obtained improved radio source positions, firstly to reconfirm the majority of the existing identifications, and secondly, using digitized sky-survey data and deep B, Gunn-i and Gunn-z CCD-imaging, to find optical identifications for 223 previously-unidentified sources. We present the final catalogue of 878 flat-spectrum sources: 827 are compact radio sources identified with galaxies, quasars and BL Lac objects, 38 have either extended radio structure or are identified with Galactic objects (PN, HII or non-compact radio source), 4 are obscured by Galactic stars, and 9 (1 per cent of the total sample) remain unidentified. Full Appendices A-D are only available in electronic form at http://www.edpsciences.org

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