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/AT20Ghttp://www.atnf.csiro.au/research/AT20G - VSOP-2 09 Mar 2007

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

3. CMB foreground removal Extragalactic radio source contamination

4. Number of pointings  2 Flux S  -0.7 Time per pointing  S -2 Survey time  3.4 1.2 cm survey takes 240 x 6cm survey Surveying problem

5. 100121612618 GHzRicci et al. 2004 AT20G 22.8 GHz 15 (33) GHz 15 GHz Freq. 4015,288 38% sky 4406 AT20G 1000All sky323Hinshaw et al. 2006 (WMAP3) 25520465Waldram et al. 2003 (9C) 206066Taylor et al.2001 S lim (mJy)Area (sq. deg.)Source no.Project Existing Surveys at high frequency

6. 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 High scan rate: 15 deg./min

7. Sky Coverage Missing Data

8. Combine the scans to make maps Candidate Sources

9. The Survey Blind scan Calibration Map making Selection criteria LIST OF CANDIDATES Follow up @ 20GHz Observation of the candidates LIST OF SOURCES 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

10. AT20G follow-up 20 GHz FU: 21-27 Oct 2004, H214 array, 18-21 GHz, BW 128 MHz - region -30/-50 deg => 1400 sources confirmed at 5 sigma Spectra FU: 03-06 Nov 2004, 1.5 array, 4.8/8.6 GHz, BW 128 MHz 20 GHz FU: 26-30 Oct 2005, H168 array, 18-21 GHz, BW 128 MHz - region -50/-90 deg => 1300 sources confirmed at 5 sigma Spectra FU: 11-14 Nov 2005, 1.5 array, 4.8/8.6 GHz, BW 128 MHz 20 GHz FU: 29 Apr-03 May 2006, H214 array, 18-21 GHz, 128 MHz -region -50/-90 deg => 1200 sources confirmed at 5 sigma Spectra FU: 19-22 June 2006, 1.5 array, 4.8/8.6 GHz, 128 GHz 20 GHz FU: 14-17 Oct 2006, H214 array, 18-21 GHz, 128 MHz -region -30/-15 deg => 1400 sources confirmed at 15 sigma Spectra FU: 09-12 Nov 2006, 1.5B array, 4.8/8.6 GHz, 128 MHz

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

12. AT20G source counts Integral source counts Normalized differential counts

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

14. AT20G Polarization Properties 5GHz8GHz18GHz Mean2.43%2.63%2.83% Median2.19%2.18%2.10% Max8.02%9.38%10.66% S 20 >500mJy;  < -30º ~200 sources observed 5GHz8GHz18GHz Burke et al. 2007 in preparation

15. Gravitational lens search Spectral index (4.8-8.6 GHz) -0.50 1 0.5 Amp(6)/Amp(no6) 0619-2054 1755-2144 PKS1830-211 0711-1951 Plot courtesy of R.Chhetri

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