The AT20G Survey
The AT20G Survey is a blind 20 GHz survey of the entire southern sky with |b|>1.5°. Observations were carried out using the Australia Telescope Compact Array (ATCA) from 2004-2008. The final AT20G catalogue consists of 5,890 sources above a 20 GHz flux density limit of 40 mJy and includes near-simultaneous observations at 4.8 and 8.6 GHz for most sources south of -15°.
A full description of the survey and resulting catalogue is presented in the source catalogue paper: Murphy, T. et al. 2010, MNRAS, 402, 2403. A detailed analysis of the AT20G sample is presented in Massardi, M. et al., 2011, MNRAS, 412, 318.
The distribution of sources, divided into 20 GHz flux bins. The empty patches near the equator at approximately 18 hrs are due to poor weather during the observations.
Data Catalogues
The AT20G catalogue
Version 1 of the AT20G catalogue was made publicly available on the 3rd of November, 2009. A description of the catalogue format can be found here. The survey strategy, observations and results can be found in Murphy, T. et al. 2010, MNRAS, 402, 2403. while a more detailed analysis of the sample is presented in Massardi, M. et al., 2011, MNRAS, 412, 318.
The AT20G Bright Source Sample
Comprises 320 of the brightest (20 GHz flux above 500 mJy) AT20G sources south of -15 degrees. The AT20G-BSS catalogue is described in detail in Massardi et al., 2008 MNRAS, 384, 775.
Optical properties of AT20G sources
Optical identifications were found by cross-matching the AT20G survey with the SuperCOSMOS database. Using the optical positions, redshifts were found from either the literature, the 6dF Galaxy Survey or additional spectroscopic observations carried out on a range of telescopes including the ANU 2.3m telescope, ESO’s New Technology Telescope (NTT) or Gemini-South. The AT20G-optical catalogue is presented in Mahony E.K. et al., 2011, MNRAS, 417, 2651.
AT20G-1FGL (1 year Fermi-LAT catalogue) matches
Crossmatching the AT20G survey with the 1st-year data release of the Fermi-LAT point source catalogue (1FGL, Abdo et al., 2010, ApJS, 188, 405) resulted in 240 identifications, corresponding to 43% of the extragalactic, southern Fermi sources. The AT20G-1FGL catalogue presented in Mahony E.K. et al., 2010, ApJ, 718, 587.
Publications
- Spectral properties and the effect on redshift cut-off of compact active galactic nuclei from the AT20G survey, Chhetri, R. et al.
2012, MNRAS, 422, 2274. - Australia Telescope 20 GHz survey: hardware, observing strategy, and scanning survey catalog, Hancock, P.J. et al. 2011, Experimental Astronomy, Volume 32, Issue 2, pp.147.
- Optical Properties of High-Frequency Radio Sources from the Australia Telescope 20 GHz (AT20G) Survey, Mahony E.K. et al.
2011, MNRAS, 417, 2651. - The Australia Telescope 20GHz (AT20G) Survey: analysis of the extragalactic source sample, Massardi, M. et al. 2011, MNRAS, 412, 318.
- Observations and properties of candidate high-frequency GPS radio sources in the AT20G survey, Hancock, P.J. et al. 2010, MNRAS, 408, 1187.
- High-frequency Radio Properties of Sources in the Fermi-LAT 1 year Point Source Catalog, Mahony, E.K. et al. 2010, ApJ, 718, 587.
- Ultra- and hyper-compact HII regions at 20 GHz, Murphy, T. et al. 2010, MNRAS, 405, 1560.
- The Australia Telescope 20 GHz Survey: The Source Catalogue, Murphy, T. et al. 2010, MNRAS, 402, 2403.
- e-VLBI observations of GHz-Peaked Spectrum (GPS) radio sources in nearby galaxies from the AT20G survey, Hancock, P.J. et al.
2009, MNRAS, 397, 2030. - Wide-field imaging and polarimetry for the biggest and brightest in the 20-GHz southern sky, Burke-Spolaor, S. et al. 2009, MNRAS, 395, 504.
- High Frequency GPS sources in the AT20G Survey, Paul Hancock. Paper presented at the 4th CSS/GPS conference, Italy, May 2008. Published in Astronomische Nachrichten.
- The extragalactic radio-source population at 95GHz, Sadler et al. 2008, MNRAS, 385, 1656.
- The Australia Telescope 20 GHz (AT20G) Survey: The Bright Source Sample, Massardi et al. 2008 MNRAS, 384, 775.
- AT20G: an all sky blind survey at 20GHz, Ron Ekers, Marcella Massardi and Elaine Sadler. Paper presented at “The Modern Radio Universe”, Manchester, UK, Oct 2007. Published in Proceedings of Science.
- High-frequency large-area surveys of extragalactic sources and their relevance for CMB experiments, Ron Ekers, Elaine Sadler and Roberto Ricci. Paper presented at “CMB and Physics of the Early Universe”, Ischia, Italy, April 21 2006. Published in Proceedings of Science.
- The properties of extragalactic radio sources selected at 20GHz, Sadler et al. 2006, MNRAS, 371, 898.
- First results from the ATCA 18GHz pilot survey, Ricci et al. 2004, MNRAS, 354, 305.
People
Members
- Ron Ekers (ATNF, PI)
- Sarah Burke-Spolaor (ATNF, Swinburne), now at JPL
- Mark Calabretta (ATNF)
- Rajan Chhetri (UNSW)
- Gianfranco De Zotti (INAF-OAPD)
- Paul Hancock (U Sydney)
- Carole Jackson (ATNF)
- Michael Kesteven (ATNF)
- Elizabeth Mahony (U Sydney, ATNF)
- Marcella Massardi (INAF-OAPD), now at INAF-IRA, Bologna
- Tara Murphy (U Sydney)
- Katherine Newton-McGee (U Sydney)
- Chris Phillips (ATNF)
- Roberto Ricci (U Calgary), now at INAF-IRA, Bologna
- Elaine Sadler (U Sydney)
- Lister Staveley-Smith (UWA)
- Ravi Subrahmanyan (Raman Research Institute)
- Mark Walker (Manly Astrophysics)
- Warwick Wilson (ATNF)
Associate members
- Martin Cohen (UC Berkeley)
- Bruce Partridge (Haverford)
- Jasper Wall (UBC)
- David McConnell (ATNF)