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29 June 2006 ISLE: a general purpose near-infrared imager and medium-resolution spectrograph for the 1.88-m telescope at Okayama Astrophysical Observatory
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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).
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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