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The Subaru Seminar is usually held in Room 104 of the Hilo Base Facility, adjacent to the main lobby. Everyone is welcome to attend. If you are interested in giving a seminar, please contact Subaru seminar organizers (Tadayuki Kodama, Tomonori Usuda, Nagayoshi Ohashi) by email : sseminar_at_subaru.naoj.org (please change"_at_" to @).

September 13, Thursday, at 2:00 pm

" Development and First Light Observation of GIGMICS (germanium immersion grating mid-infrared cryogenic spectrograph) "

Yasuhiro HIRAHARA

(Nagoya University)


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 micron) in wavelength with maximum resolving power R~40,000. A single crystal germanium echelle immersion grating (30 ~ 30 ~ 72 mm) for collimated beam size of 28 mm (diameter) 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 gfirst lighth 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. As a result, we successfully detected 24 lines of 12CO2 (v1, v2^l, v3, r)=(0, 1^1, 1, 1) <- (1, 1^1, 0, 1) and 11 lines of -13CO2 (0, 0^0, 1, 1) <- (1, 0^0, 0, 1) transitions in Venus. Among these two transitions, 13 lines were detected for the first time. Toward the planetary nebula NGC-7027, We detected [S IV] forbidden line (2P3/2->2P1/2) at 10.510 micron, and investigated the spatial distribution for the first time in the ground based spectroscopic observation.


Seminars are also held at JAC, CFHT, and IfA.



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