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9 July 2008 ISLE: near-infrared imager/spectrograph for the 1.88m Telescope at Okayama Astrophysical Observatory
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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.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Kenshi Yanagisawa, Kiichi Okita, Yasuhiro Shimizu, Masaaki Otsuka, Shogo Nagayama, Ikuru Iwata, Shinobu Ozaki, Michitoshi Yoshida, Hidehiko Nakaya, Akito Tajitsu, Shin-ichiro Okumura, and Tomoyasu Yamamuro "ISLE: near-infrared imager/spectrograph for the 1.88m Telescope at Okayama Astrophysical Observatory", Proc. SPIE 7014, Ground-based and Airborne Instrumentation for Astronomy II, 701437 (9 July 2008); https://doi.org/10.1117/12.788905
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