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Proceedings Paper

ISLE: a general purpose near-infrared imager and medium-resolution spectrograph for the 1.88-m telescope at Okayama Astrophysical Observatory
Author(s): 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
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Paper 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).

Paper Details

Date Published: 29 June 2006
PDF: 12 pages
Proc. SPIE 6269, Ground-based and Airborne Instrumentation for Astronomy, 62693Q (29 June 2006); doi: 10.1117/12.670956
Show Author Affiliations
Kenshi Yanagisawa, Okayama Astrophysical Observatory, National Astronomical Observatory of Japan (Japan)
Yasuhiro Shimizu, Okayama Astrophysical Observatory, National Astronomical Observatory of Japan (Japan)
Kiichi Okita, Okayama Astrophysical Observatory, National Astronomical Observatory of Japan (Japan)
Shogo Nagayama, Okayama Astrophysical Observatory, National Astronomical Observatory of Japan (Japan)
Yasuhiko Sato, Tokyo Univ. of Science (Japan)
Okayama Astrophysical Observatory, National Astronomical Observatory of Japan (Japan)
Hisashi Koyano, Okayama Astrophysical Observatory, National Astronomical Observatory of Japan (Japan)
Takafumi Okada, Okayama Astrophysical Observatory, National Astronomical Observatory of Japan (Japan)
Ikuru Iwata, Okayama Astrophysical Observatory, National Astronomical Observatory of Japan (Japan)
Fumihiro Uraguchi, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Etsuji Watanabe, Okayama Astrophysical Observatory, National Astronomical Observatory of Japan (Japan)
Michitoshi Yoshida, Okayama Astrophysical Observatory, National Astronomical Observatory of Japan (Japan)
Shin-ichiro Okumura, Bisei Space Guard Ctr., Japan Space Guard Association (Japan)
Okayama Astrophysical Observatory, National Astronomical Observatory of Japan (Japan)
Hidehiko Nakaya, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Tomoyasu Yamamuro, Genesia Corp. (Japan)


Published in SPIE Proceedings Vol. 6269:
Ground-based and Airborne Instrumentation for Astronomy
Ian S. McLean; Masanori Iye, Editor(s)

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