First light observation of GIGMICS (germanium immersion grating mid-infrared cryogenic spectrograph) by Kanata 1.5-m Telescope at Higashi-Hiroshima Observatory

Yasuhiro Hirahara; Keishin Aoki; Kanako Ohta; Sho Shibata; Tsuyoshi Hirao; Yoshio Tatamitani; Noboru Ebizuka; Koji S. Kawabata; Michitoshi Yoshida; Makoto Uemura; Takashi Oosugi; Kentaro Kawaguchi; Ryuji Fujimori; Hiroki Ohiwa; Hisayuki Nagahiro

doi:10.1117/12.925734

24 September 2012 First light observation of GIGMICS (germanium immersion grating mid-infrared cryogenic spectrograph) by Kanata 1.5-m Telescope at Higashi-Hiroshima Observatory

Yasuhiro Hirahara, Keishin Aoki, Kanako Ohta, Sho Shibata, Tsuyoshi Hirao, Yoshio Tatamitani, Noboru Ebizuka, Koji S. Kawabata, Michitoshi Yoshida, Makoto Uemura, Takashi Oosugi, Kentaro Kawaguchi, Ryuji Fujimori, Hiroki Ohiwa, Hisayuki Nagahiro

Author Affiliations +

Proceedings Volume 8446, Ground-based and Airborne Instrumentation for Astronomy IV; 84463Y (2012) https://doi.org/10.1117/12.925734
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

We have developed a germanium immersion grating mid-infrared cryogenic spectrograph (GIGMICS) designed for the Nasmyth focus stage of NAOJ Subaru 8.2-m telescope, which operates at N-band (8-13 μm) in wavelength (λ) with maximum resolving power R（≡λ/Δλ） ~ 50,000. A single crystal germanium echelle immersion grating (30 × 30 × 72 mm) for collimated beam size of 28 mmφ was fabricated by utilizing ultra precision micro-grinding method coupled with the ELID (ELectrolytic In-process Dressing) technique (Ohmori, H. 1992, Ebizuka et al. 2003, Tokoro et al. 2003). After the critical test for the application to the laboratory gas-phase IR high-resolution spectroscopy(Hirahara et al. 2010), we have conducted the “first light” astronomical observation of GIGMICS by the Kanata 1.5-m telescope at Higashi- Hiroshima Observatory from January to April, 2011. Toward many astronomical objects such as the Moon, Venus, Jupiter, circumstellar envelopes of late-type stars, proto-planetary nebulae, and interstellar molecular clouds in the vicinity of star-forming regions, we conducted spectroscopic observations in the N-band region.

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Yasuhiro Hirahara, Keishin Aoki, Kanako Ohta, Sho Shibata, Tsuyoshi Hirao, Yoshio Tatamitani, Noboru Ebizuka, Koji S. Kawabata, Michitoshi Yoshida, Makoto Uemura, Takashi Oosugi, Kentaro Kawaguchi, Ryuji Fujimori, Hiroki Ohiwa, and Hisayuki Nagahiro "First light observation of GIGMICS (germanium immersion grating mid-infrared cryogenic spectrograph) by Kanata 1.5-m Telescope at Higashi-Hiroshima Observatory", Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84463Y (24 September 2012); https://doi.org/10.1117/12.925734

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