ISLE: a general purpose near-infrared imager and medium-resolution spectrograph for the 1.88-m telescope at Okayama Astrophysical Observatory

Kenshi Yanagisawa; Yasuhiro Shimizu; Kiichi Okita; Shogo Nagayama; Yasuhiko Sato; Hisashi Koyano; Takafumi Okada; Ikuru Iwata; Fumihiro Uraguchi; Etsuji Watanabe; Michitoshi Yoshida; Shin-ichiro Okumura; Hidehiko Nakaya; Tomoyasu Yamamuro

doi:10.1117/12.670956

29 June 2006 ISLE: a general purpose near-infrared imager and medium-resolution spectrograph for the 1.88-m telescope at Okayama Astrophysical Observatory

Kenshi Yanagisawa, Yasuhiro Shimizu, Kiichi Okita, Shogo Nagayama, Yasuhiko Sato, Hisashi Koyano, Takafumi Okada, Ikuru Iwata, Fumihiro Uraguchi, Etsuji Watanabe, Michitoshi Yoshida, Shin-ichiro Okumura, Hidehiko Nakaya, Tomoyasu Yamamuro

Author Affiliations +

Proceedings Volume 6269, Ground-based and Airborne Instrumentation for Astronomy; 62693Q (2006) https://doi.org/10.1117/12.670956
Event: SPIE Astronomical Telescopes + Instrumentation, 2006, Orlando, Florida , United States

Abstract

ISLE is a near-infrared (1.0-2.5μm) imager and spectrograph for the Cassegrain focus (f/18) of the 1.88 m telescope at Okayama Astrophysical Observatory. The detector is a HAWAII 1024 × 1024 HgCdTe Array, which covers 4.2 × 4.2 arcmin² field of view with a pixel scale of 0.25 arcsec/pixel. ISLE also provides medium (R=300 - 4800) resolution long-slit (4 arcmin long spectroscopic capabilities using reflection gratings. A dedicated front-end electronics for the detector achieved a readout noise of 8 electrons by the conventional Fowler sampling, and a operation scheme that combined with a number of discarded readout greatly suppressed the reset anomaly. The measured limiting magnitudes were J=18.6 and K=17.7 (imaging of point sources at S/N=10 for 10 min. exposure).

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Kenshi Yanagisawa, Yasuhiro Shimizu, Kiichi Okita, Shogo Nagayama, Yasuhiko Sato, Hisashi Koyano, Takafumi Okada, Ikuru Iwata, Fumihiro Uraguchi, Etsuji Watanabe, Michitoshi Yoshida, Shin-ichiro Okumura, Hidehiko Nakaya, and Tomoyasu Yamamuro "ISLE: a general purpose near-infrared imager and medium-resolution spectrograph for the 1.88-m telescope at Okayama Astrophysical Observatory", Proc. SPIE 6269, Ground-based and Airborne Instrumentation for Astronomy, 62693Q (29 June 2006); https://doi.org/10.1117/12.670956

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