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Proceedings Paper

ISLE: near-infrared imager/spectrograph for the 1.88m Telescope at Okayama Astrophysical Observatory
Author(s): Kenshi Yanagisawa; Kiichi Okita; Yasuhiro Shimizu; Masaaki Otsuka; Shogo Nagayama; Ikuru Iwata; Shinobu Ozaki; Michitoshi Yoshida; Hidehiko Nakaya; Akito Tajitsu; Shin-ichiro Okumura; Tomoyasu Yamamuro
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Paper Abstract

ISLE is a near-infrared imager and spectrograph for the Cassegrain focus (f/18) of the 1.88 m telescope at Okayama Astrophysical Observatory. It is upgraded instrument with a new detector, HAWAII-1 HgCdTe array and new optics. ISLE provides imaging capabilities which covers 4.2 × 4.2 arcmin2 field-of-view at 0.25 arc-sec/ pixel and long-slit (4 arcmin) spectroscopic capabilities at λ/Δλ = 1000 - 4000 using reflection gratings. The noise performance of the detector is excellent. The read noise of 2.5 electrons with 25 Fowler pairs has been achieved, that is one of the world's lowest level among the instruments which use HAWAII-1 array as the detector. We discuss the technical performance of ISLE and examine the upgrade effectiveness.

Paper Details

Date Published: 9 July 2008
PDF: 12 pages
Proc. SPIE 7014, Ground-based and Airborne Instrumentation for Astronomy II, 701437 (9 July 2008); doi: 10.1117/12.788905
Show Author Affiliations
Kenshi Yanagisawa, Okayama Astrophysical Observatory, National Astronomical Observatory of Japan (Japan)
Kiichi Okita, Okayama Astrophysical Observatory, National Astronomical Observatory of Japan (Japan)
Yasuhiro Shimizu, Okayama Astrophysical Observatory, National Astronomical Observatory of Japan (Japan)
Masaaki Otsuka, Okayama Astrophysical Observatory, National Astronomical Observatory of Japan (Japan)
Shogo Nagayama, Okayama Astrophysical Observatory, National Astronomical Observatory of Japan (Japan)
Ikuru Iwata, Okayama Astrophysical Observatory, National Astronomical Observatory of Japan (Japan)
Shinobu Ozaki, Okayama Astrophysical Observatory, National Astronomical Observatory of Japan (Japan)
Michitoshi Yoshida, Okayama Astrophysical Observatory, National Astronomical Observatory of Japan (Japan)
Hidehiko Nakaya, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Akito Tajitsu, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Shin-ichiro Okumura, Japan Space Guard Association (Japan)
Tomoyasu Yamamuro, OptCraft (Japan)


Published in SPIE Proceedings Vol. 7014:
Ground-based and Airborne Instrumentation for Astronomy II
Ian S. McLean; Mark M. Casali, Editor(s)

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