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Getting lucky with adaptive optics: fast adaptive optics image selection in the visible with a large telescope

Law, N. M. and Mackay, C. D. and Dekany, R. G. and Ireland, M. and Lloyd, J. P. and Moore, A. M. and Robertson, J. G. and Tuthill, P. and Woodruff, H. C. (2009) Getting lucky with adaptive optics: fast adaptive optics image selection in the visible with a large telescope. Astrophysical Journal, 692 (1). pp. 924-930. ISSN 0004-637X. doi:10.1088/0004-637X/692/1/924.

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We describe the results from a new instrument which combines Lucky Imaging and adaptive optics (AO) to give the first routine direct diffraction-limited imaging in the visible on a 5 m telescope. With fast image selection and alignment behind the Palomar AO system we obtained Strehl ratios of 5%-20% at 700 nm in a typical range of seeing conditions, with a median Strehl of approximately 12% when 10% of the input frames are selected. At wavelengths around 700 nm the system gave diffraction-limited 35 mas full width at half-maxima (FWHMs). At 950 nm the output Strehl ratio was as high as 36% and at 500 nm the FWHM resolution was as small as 42 mas, with a low Strehl ratio but with resolution improved by a factor of ~20 compared to the prevailing seeing. To obtain wider fields we also used multiple Lucky Imaging guide stars in a configuration similar to a ground layer AO system. With eight guide stars but very undersampled data we obtained 300 mas resolution across a 30" × 30" field of view in the i' band.

Item Type:Article
Related URLs:
URLURL TypeDescription
Law, N. M.0000-0001-9380-6457
Ireland, M.0000-0002-6194-043X
Moore, A. M.0000-0002-2894-6936
Additional Information:© 2009 The American Astronomical Society. Received 2008 May 13; accepted 2008 October 21; published 2009 February 20. We particularly thank the PALMAO team, especially Jenny Roberts and Antonin Bouchez, for all their help during the design, setup, and operation of the instrument. Thanks also go to the Palomar Observatory team for great assistance throughout our run. We thank Chris Koresko for providing the ADC design. Facilities: Hale.
Subject Keywords:instrumentation: adaptive optics; instrumentation: high angular resolution; methods: data analysis; techniques: high angular resolution; techniques: image processing
Issue or Number:1
Record Number:CaltechAUTHORS:20090420-145533425
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:14033
Deposited By: Tony Diaz
Deposited On:22 Apr 2009 18:20
Last Modified:08 Nov 2021 22:42

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