ISLE: near-infrared imager/spectrograph for the 1.88m Telescope at Okayama Astrophysical Observatory

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

doi:10.1117/12.788905

9 July 2008 ISLE: near-infrared imager/spectrograph for the 1.88m Telescope at Okayama Astrophysical Observatory

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

Author Affiliations +

Proceedings Volume 7014, Ground-based and Airborne Instrumentation for Astronomy II; 701437 (2008) https://doi.org/10.1117/12.788905
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

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.

Citation Download Citation

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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