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Hokupa'a anisoplana...
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Flicker, RalfLund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science
(author)
Hokupa'a anisoplanatism and Mauna Kea turbulence characterization
- Article/chapterEnglish2002
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LIBRIS-ID:oai:lup.lub.lu.se:13e35d8d-1c7a-4b95-9597-b63c91047754
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https://lup.lub.lu.se/record/330255URI
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https://doi.org/10.1086/342183DOI
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Language:English
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Summary in:English
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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) over bar by model-fitting synthetic data. From the relatively small statistical sample, we obtain a median (h) over bar =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 Napproximate to18, i.e., on the average slightly better than 4 radial degrees.
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Rigaut, FJ
(author)
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Astronomi - Genomgår omorganisationInstitutionen för astronomi och teoretisk fysik - Genomgår omorganisation
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In:Publications of the Astronomical Society of the Pacific: IOP Publishing114:799, s. 1006-10151538-38730004-6280
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