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

GSAOI for Gemini South

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)

Adaptive Optics

Natural Seeing

Classical Adaptive Optics

Multi-Conjugate Adaptive Optics

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

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

On-Detector Guide Windows

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

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

GSAOI Performance ZJHK Time (s) 3600 SNR 10 Aperture ( " ) 0.08 Seeing ( " ) 0.4 Strehl Magnitude (star) ODGW (10 ms) ODGW (30 s)

Bulk Motions from SBF Local Group Virgo Great Attractor

Star Formation Histories And V - GMOS