Extragalactic radio sources selected at 20GHz (Sadler+, 2006)

Computer Science

Scientific paper

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Surveys, Radio Sources

Scientific paper

We present some first results on the variability, polarization and general properties of radio sources selected at 20GHz, the highest frequency at which a sensitive radio survey has been carried out over a large area of sky. Sources with flux densities above 100 mJy in the Australia Telescope Compact Array 20GHz pilot survey at declination 60{deg} to 70{deg} were observed at up to three epochs during 2002-04, including near-simultaneous measurements at 5, 8 and 18GHz in 2003. Of the 173 sources detected, 65 per cent are candidate QSOs or BL Lac objects, 20 per cent galaxies and 15 per cent faint (bJ>22mag) optical objects or blank fields.
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