Gemini South Adaptive Optics Imager

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Gemini South Adaptive Optics Imager

• Peter McGregor
• Research School of Astronomy Astrophysics
• The Australian National University

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GSAOI for Gemini South
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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)

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Adaptive Optics
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Natural Seeing
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Classical Adaptive Optics
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Multi-Conjugate Adaptive Optics
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Multi-Conjugate Adaptive Optics
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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 Lya filters at J?
• Four HAWAII-2RG detectors
• 40804080 pixels

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On-Detector Guide Windows
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GSAOI Guide Star Geometry

• 5 LGS
• 1-3 Opt. NGS
• 1-4 NIR NGS

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GSAOI Guide Star Geometry

• 5 LGS
• 1-3 Opt. NGS
• 1-4 NIR NGS

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GSAOI Performance
Z J H K
Time (s) 3600 3600 3600 3600
SNR 10 10 10 10
Aperture (") 0.08 0.08 0.08 0.08
Seeing (") 0.4 0.4 0.4 0.4
Strehl 0.2 0.2 0.4 0.6
Magnitude (star) 25.6 24.1 24.1 23.7
ODGW (10 ms) 15.1 14.2 14.5 13.5
ODGW (30 s) 22.7 21.2 21.0 20.2
http//www.mso.anu.edu.au/gsaoi
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Bulk Motions from SBF
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Star Formation Histories