25 July 2008 First light of UT 15-band dichroic-mirror camera
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Abstract
A dichroic mirror/filter can divide light into two different wavelength bands by the principle of interference. We proposed to use more than a dozen of these mirrors, and make a simultaneous imager in many color bands. This also enables us to make a powerful spectrograph which uses many CCDs. We here report the first light of UT 15-band Dichroic-Mirror Camera. We successfully obtained the first light at the Cassegrain focus of the 1.5-m Kanata telescope in May 2007. We also carried out the second observing run in March 2008. Our instrument covers a wide wavelength range (390-930nm), and the field of view is about 4.5 arcmin in diameter with 0.27arcsec/pixel. Image quality was limited by seeing (~1.2 arcsec at best). We describe basic design, characteristics, and performance of our instrument as well as early observational results. Future prospect of dichroic mirrors instruments will also be briefly discussed.
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Mamoru Doi, Junji Hayano, Hiroyuki Utsunomiya, Yutaka Ihara, Kouichi Tokita, Shigeyuki Sako, Sadanori Okamura, Naohiro Takanashi, Tomoki Morokuma, Hisanori Furusawa, Hidehiko Nakaya, Yutaka Komiyama, Masafumi Yagi, Norio Okada, Akira Arai, Makoto Uemura, Koji S. Kawabata, Takuya Yamashita, Takashi Ohsugi, Hiroko Ito, Hanindyo Kuncarayakti, Masanao Abe, Sunao Hasegawa, Norihide Takeyama, Tomoyasu Yamamuro, Satoru Iwamura, "First light of UT 15-band dichroic-mirror camera", Proc. SPIE 7014, Ground-based and Airborne Instrumentation for Astronomy II, 70140F (25 July 2008); doi: 10.1117/12.788554; https://doi.org/10.1117/12.788554
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