The AT20G high-angular-resolution catalogue
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We present the high-angular-resolution catalogue for the Australia Telescope 20 GHz (AT20G) survey, using the high-angular-resolution 6-km antenna data at the baselines of~4500mof the Australia Telescope Compact Array. We have used the data to produce the visibility catalogue that separates the compact active galactic nuclei (AGNs) from the extended radio sources at the 0.15 arcsec angular scale, corresponding to the linear size scale of 1 kpc at redshifts higher than 0.7. We find the radio population at 20 GHz to be dominated by compact AGNs constituting 77 per cent of the total sources in the AT20G. We introduce the visibility-spectra diagnostic plot, produced using the AT20G cross-matches with lower frequency radio surveys at 1 GHz [the NRAO VLA Sky Survey (NVSS) and the Sydney University Molonglo Sky Survey (SUMSS)], that separates the 20 GHz population into distinct sub-populations of the compact AGNs, the compact steep-spectrum (CSS) sources, the extended AGN-powered sources and extended flat-spectrum sources. The extended flat-spectrum sources include a local thermal emitting population of high-latitude planetary nebulae and also gravitational lens and binary black hole candidates among the AGNs. We find a smooth transition in properties between the CSS sources and the AGN populations. The visibility catalogue, together with the main AT20G survey, provides an estimate of angular size scales for sources in the AT20G and an estimate of the flux arising from central cores of extended radio sources. The identification of the compact AGNs in the AT20G survey provides high-quality calibrators for high-frequency radio telescope arrays and very large baseline interferometry observations. ©2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.
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Spectral properties and the effect on redshift cut-off of compact active galactic nuclei from the AT20G surveyChhetri, R.; Ekers, Ronald; Mahony, E.; Jones, P.; Massardi, M.; Ricci, R.; Sadler, E. (2012)Spectral index has been traditionally used to separate extragalactic radio sources into compact and extended populations, with the spectral transition placed variably between -0.4 and -0.6. We use high angular resolution ...
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Murphy, T.; Sadler, E.; Ekers, Ronald; Massardi, M.; Hancock, Paul; Mahony, E.; Ricci, R.; Burke-Spolaor, S.; Calabretta, M.; Chhetri, R.; De Zotti, G.; Edwards, P.; Ekers, J.; Jackson, Carole; Kesteven, M.; Lindley, E.; Newton-McGee, K.; Phillips, C.; Roberts, P.; Sault, R.; Staveley-Smith, L.; Subrahmanyan, R.; Walker, M.; Wilson, W. (2010)We present the full source catalogue from the Australia Telescope 20 GHz (AT20G) Survey. The AT20G is a blind radio survey carried out at 20 GHz with the Australia Telescope Compact Array (ATCA) from 2004 to 2008, and ...