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
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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, Yasuhiro Hirahara, Keishin Aoki, Keishin Aoki, Kanako Ohta, Kanako Ohta, Sho Shibata, Sho Shibata, Tsuyoshi Hirao, Tsuyoshi Hirao, Yoshio Tatamitani, Yoshio Tatamitani, Noboru Ebizuka, Noboru Ebizuka, Koji S. Kawabata, Koji S. Kawabata, Michitoshi Yoshida, Michitoshi Yoshida, Makoto Uemura, Makoto Uemura, Takashi Oosugi, Takashi Oosugi, Kentaro Kawaguchi, Kentaro Kawaguchi, Ryuji Fujimori, Ryuji Fujimori, Hiroki Ohiwa, Hiroki Ohiwa, Hisayuki Nagahiro, 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); doi: 10.1117/12.925734; https://doi.org/10.1117/12.925734
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