1. Gemini South Adaptive Optics Imager Peter McGregor Research School of Astronomy & Astrophysics The Australian National University

2. GSAOI for Gemini South

3. GSAOI Status  Under construction at Mt. Stromlo Obs., ANU  Completed “zeroeth” cool down for thermal tests  First cool down with mechanisms in July 2004  One science detector and two eng. detectors  Shipment scheduled for October 2005  Commissioning January 2006 (after MCAO-1)

4. Adaptive Optics

5. Natural Seeing

6. Classical Adaptive Optics

7. Multi-Conjugate Adaptive Optics

8. NGS WFS Path Science Path LGS WFS Path Multi-Conjugate Adaptive Optics

9. GSAOI Specifications  Used with MCAO system  Field-of-view: 85  85   Spatial pixel size: 0.02  0.02   Broad band filters: Z, J, H, Ks, K', K  Narrow band filters: 1.5% wide zero- redshift emission-line filters  Narrow band Lyα filters at J ?  Four HAWAII-2RG detectors 4080×4080 pixels

10. On-Detector Guide Windows

11. GSAOI Guide Star Geometry  5 LGS  1-3 Opt. NGS  1-4 NIR NGS

12. GSAOI Guide Star Geometry  5 LGS  1-3 Opt. NGS  1-4 NIR NGS

13. GSAOI Performance ZJHK Time (s) 3600 SNR 10 Aperture ( " ) 0.08 Seeing ( " ) 0.4 Strehl 0.2 0.40.6 Magnitude (star) 25.624.1 23.7 ODGW (10 ms) 15.114.214.513.5 ODGW (30 s) 22.721.221.020.2 http://www.mso.anu.edu.au/gsaoi

14. Bulk Motions from SBF Local Group Virgo Great Attractor

15. Star Formation Histories And V - GMOS