Physics – Optics
Scientific paper
Sep 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002pasp..114.1006f&link_type=abstract
The Publications of the Astronomical Society of the Pacific, Volume 114, Issue 799, pp. 1006-1015.
Physics
Optics
4
Instrumentation: Adaptive Optics, Methods: Data Analysis
Scientific paper
A data set of adaptive optics images has been analyzed in order to study the effects of angular anisoplanatism and to characterize Mauna Kea nighttime turbulence. The data set consists of a selection of Galactic center images obtained with the adaptive optics instrument Hokupa`a and the near-infrared camera QUIRC on the Gemini-North 8 m telescope. Using the Strehl ratio and the FWHM as tracers for anisoplanatism in the images, it is possible to draw conclusions about the effective turbulence height h by model-fitting synthetic data. From the relatively small statistical sample, we obtain a median h=3.5 km, with 10th and 90th percentiles being 2.2 and 5.6 km. The implications of these findings for a turbulence-conjugated adaptive optics system are addressed. We also find the Zernike modal equivalent of Hokupa`a to be N~18, i.e., on the average slightly better than 4 radial degrees. Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the Particle Physics and Astronomy Research Council (United Kingdom), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), CNPq (Brazil), and CONICET (Argentina). The Adaptive Optics System Hokupa`a/QUIRC was developed and operated by the University of Hawaii Adaptive Optics Group, with support from the National Science Foundation.
Flicker Ralf C.
Rigaut Francois J.
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