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Simultaneous seeing measurement through the Subaru Telescope in the visible and near-infrared bands for the wavelength dependence evaluation |
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| Authors: | Shin Oya Hiroshi Terada Yutaka Hayano Makoto Watanabe Masayuki Hattori Yosuke Minowa |
| Institution: | 1.TMT-J Project Office,National Astronomical Observatory of Japan,Mitaka,Japan;2.Thirty Meter Telescope Project,National Astronomical Observatory of Japan,Pasadena,USA;3.Advanced Technology Center / TMT-J Project Office,National Astronomical Observatory of Japan,Mitaka,Japan;4.Department of Applied Physics,Okayama University of Science,Okayama,Japan;5.Spectrography and Bioimaging Facility,National Institute for Basic Biology,Okazaki,Japan;6.Subaru Telescope,Hilo,USA |
| Abstract: | Stellar images have been obtained under natural seeing at visible and near-infrared wavelengths simultaneously through the Subaru Telescope at Mauna Kea. The image quality is evaluated by the full-width at the half-maximum (FWHM) of the stellar images. The observed ratio of FWHM in the V-band to the K-band is 1.54 ± 0.17 on average. The ratio shows tendency to decrease toward bad seeing as expected from the outer scale influence, though the number of the samples is still limited. The ratio is important for simulations to evaluate the performance of a ground-layer adaptive optics system at near-infrared wavelengths based on optical seeing statistics. The observed optical seeing is also compared with outside seeing to estimate the dome seeing of the Subaru Telescope. |
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