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Journal of Astronomical Telescopes, Instruments, and Systems

Point spread function reconstruction validated using on-sky CANARY data in multiobject adaptive optics mode
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Paper Abstract

In preparation of future multiobject spectrographs (MOS) whose one of the major role is to provide an extensive statistical studies of high redshifted galaxies surveyed, the demonstrator CANARY has been designed to tackle technical challenges related to open-loop adaptive optics (AO) control with jointed Natural Guide Star and Laser Guide Star tomography. We have developed a point spread function (PSF) reconstruction algorithm dedicated to multiobject adaptive optics systems using system telemetry to estimate the PSF potentially anywhere in the observed field, a prerequisite to postprocess AO-corrected observations in integral field spectroscopy. We show how to handle off-axis data to estimate the PSF using atmospheric tomography and compare it to a classical approach that uses on-axis residual phase from a truth sensor observing a natural bright source. We have reconstructed over 450 on-sky CANARY PSFs and we get bias/1-σ standard-deviation (std) of 1.3/4.8 on the H-band Strehl ratio (SR) with 92.3% of correlation between reconstructed and sky SR. On the full-width at half-maximum, we get, respectively, 2.94 mas, 19.9 mas, and 88.3% for the bias, std, and correlation. The reference method achieves 0.4/3.5/95% on the SR and 2.71 mas/14.9 mas/92.5% on the FWHM for the bias/std/correlation.

Paper Details

Date Published: 31 October 2016
PDF: 10 pages
J. Ast. Inst. Sys. 2(4) 048001 doi: 10.1117/1.JATIS.2.4.048001
Published in: Journal of Astronomical Telescopes, Instruments, and Systems Volume 2, Issue 4
Show Author Affiliations
Olivier A. Martin, Lab. d'Astrophysique de Marseille (France)
Carlos M. Correia, Lab. d'Astrophysique de Marseille (France)
Eric Gendron, Univ. Paris 7-Denis Diderot (France)
Gerard Rousset, Univ. Paris 7-Denis Diderot (France)
Damien Gratadour, Lab. d'Etudes Spatiales et d'Instrumentation en Astrophysique (France)
Fabrice Vidal, Lab. d'Etudes Spatiales et d'Instrumentation en Astrophysique (France)
Tim J. Morris, Durham Univ. (United Kingdom)
Alastair G. Basden, Durham Univ. (United Kingdom)
Richard M. Myers, Durham Univ. (United Kingdom)
Benoit Neichel, Lab. d'Astrophysique de Marseille (France)
Thierry Fusco, Aix Marseille Univ. (France)
ONERA (France)

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