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 PathScience Path LGS WFS Path

Multi-Conjugate Adaptive Optics

GSAOI Specifications

Used with MCAO system Field-of-view: 8585 Spatial pixel size: 0.020.02 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

Z J H K

Time (s) 3600 3600 3600 3600SNR 10 10 10 10Aperture (") 0.08 0.08 0.08 0.08Seeing (") 0.4 0.4 0.4 0.4Strehl 0.2 0.2 0.4 0.6Magnitude (star) 25.6 24.1 24.1 23.7ODGW (10 ms) 15.1 14.2 14.5 13.5ODGW (30 s) 22.7 21.2 21.0 20.2

http://www

.mso.anu.e

du.au/gsao

i

Bulk Motions from SBF

Local Group

Virgo

Great Attractor

Star Formation Histories

And V - GMOS