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Australia Telescope 20 GHz survey (AT20G): An Update

Australia Telescope 20 GHz survey (AT20G): An Update. Ron Ekers (ATNF, PI),Sarah Burke(Haverford-Swinburne), Mark Calabretta (ATNF), Gianfranco De Zotti (Padua), Paul Hancock (U Sydney), Carole Jackson (ATNF), Michael Kesteven (ATNF), Marcella Massardi (SISSA-ATNF),

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Australia Telescope 20 GHz survey (AT20G): An Update

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  1. Australia Telescope 20 GHz survey (AT20G): An Update Ron Ekers (ATNF, PI),Sarah Burke(Haverford-Swinburne), Mark Calabretta (ATNF), Gianfranco De Zotti (Padua), Paul Hancock (U Sydney), Carole Jackson (ATNF), Michael Kesteven (ATNF), Marcella Massardi (SISSA-ATNF), Tara Murphy (U Sydney), Katherine Newton-McGee (U Sydney), Chris Phillips (ATNF), Roberto Ricci (ATNF), Elaine Sadler (U Sydney), Lister Staveley-Smith (ATNF), Mark Walker (MAW Tech), Jasper Wall (UBC), Warwick Wilson (ATNF) http://www.atnf.csiro.au/research/AT20G - VSOP-2 09 Mar 2007

  2. Motivations ATCA ALMA SKA • Radio Source population studies • CMB Missions WMAP & PLANCK • Calibrator manuals for radiotelescopes

  3. Existing Surveys at high frequency Project Freq. Source no. Area (sq. deg.) Slim (mJy) Taylor et al.2001 15 GHz 66 60 20 Waldram et al. 2003 (9C) 15 (33) GHz 465 520 25 Hinshaw et al. 2006 (WMAP3) 22.8 GHz 323 All sky 1000 Ricci et al. 2004 18 GHz 126 1216 100 AT20G AT20G 4406 15,288 38% sky 40

  4. WBCORR • Wide Band analogue correlator • Frequency range 16-24 GHz • Bandwidth 8GHz (8 frequency channels) • All sky in 10(15)degree declination regions • includes galactic plane • No delay correction possible • scan along the meridian • High scan rate: 15 deg./min

  5. Sky Coverage Missing Data

  6. Combine the scans to make maps Candidate Sources

  7. Blind scan Calibration Map making Selection criteria The Survey LIST OF CANDIDATES Follow up @ 20GHz Observation of the candidates LIST OF SOURCES Follow up @ 4.8 and 8.6 GHz low frequency observations of the confirmed sources DATA ON EACH SOURCE PIPELINE of data analysis flagging calibration data reduction polarization analyses imaging AT20G CATALOGUE

  8. Equal area sky maps of the AT20G follow-up sources (2004-2006) Polar projection Aitoff projection 4406 extragalactic sources detected in 15288 sq. deg.

  9. AT20G source counts Normalized differential counts Integral source counts

  10. Spectral index from AT20G 2004-2006 All AT20G sample Bright Sample (S20 > 0.5 Jy) 8% 20% 11% 13% 53% 22% 29% 43% 3737 extragalactic sources 280 extragalactic sources Massardi et al. 2007 in prep.

  11. AT20G Polarization Properties • S20>500mJy; d < -30º • ~200 sources observed 5GHz 8GHz 18GHz Burke et al. 2007 in preparation

  12. Gravitational lens search -0.5 0 1 Amp(6)/Amp(no6) 0619-2054 0.5 1755-2144 0711-1951 PKS1830-211 Spectral index (4.8-8.6 GHz) Plot courtesy of R.Chhetri

  13. The Future of AT20G • Clean-up follow-ups (C1049: -90°<dec< -15º) • Follow-up of galactic objects (UCHII: Murphy et al. 2007 in prep.) • 3mm follow-up (C1392: Sadler et al. 2007 in prep.) • Variability studies (2002-2004: Sadler et al. 2006) • Polarization studies (C1633: Burke et al. 2007 in prep.) • Upcoming data release (BSS: Massardi et al. 2007 in prep.) • Search for grav. lenses(CLASS in the South: Chhetri et al.) • ...

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