ANIR: Atacama near-infrared camera for the 1.0 m miniTAO telescope

被引:24
|
作者
Konishi, Masahiro [1 ]
Motohara, Kentaro [1 ]
Tateuchi, Ken [1 ]
Takahashi, Hidenori [1 ]
Kitagawa, Yutaro [1 ]
Kato, Natsuko [1 ]
Sako, Shigeyuki [1 ]
Uchimoto, Yuka K. [1 ,2 ]
Toshikawa, Koji [1 ]
Ohsawa, Ryou [3 ]
Yamamuro, Tomoyasu [4 ]
Asano, Kentaro [1 ]
Ita, Yoshifusa [2 ,5 ]
Kamizuka, Takafumi [1 ]
Komugi, Shinya [5 ,6 ,7 ]
Koshida, Shintaro [1 ,8 ,9 ]
Manabe, Sho [10 ]
Matsunaga, Noriyuki [3 ]
Minezaki, Takeo [1 ]
Morokuma, Tomoki [1 ]
Nakashima, Asami [3 ,5 ,12 ]
Takagi, Toshinobu [6 ]
Tanabe, Toshihiko [1 ]
Uchiyama, Mizuho [1 ]
Aoki, Tsutomu [11 ]
Doi, Mamoru [1 ]
Handa, Toshihiro [1 ,13 ]
Kato, Daisuke [3 ]
Kawara, Kimiaki [1 ]
Kohno, Kotaro [1 ]
Miyata, Takashi [1 ]
Nakamura, Tomohiko [1 ,3 ,14 ]
Okada, Kazushi [1 ]
Soyano, Takao [11 ]
Tamura, Yoichi [1 ]
Tanaka, Masuo [1 ]
Tarusawa, Ken'ichi [11 ]
Yoshii, Yuzuru [1 ]
机构
[1] Univ Tokyo, Inst Astron, Mitaka, Tokyo 1810015, Japan
[2] Tohoku Univ, Astron Inst, Aoba Ku, Sendai, Miyagi 9808578, Japan
[3] Univ Tokyo, Dept Astron, Bunkyo Ku, Tokyo 1130033, Japan
[4] OptCraft, Midori Ku, Sagamihara, Kanagawa 2520144, Japan
[5] Natl Astron Observ Japan, Mitaka, Tokyo 1818588, Japan
[6] Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Chuo Ku, Sagamihara, Kanagawa 2525210, Japan
[7] Joint ALMA Observ, Santiago 7630355, Chile
[8] Pontificia Univ Catolica Chile, Dept Elect Engn, Santiago, Chile
[9] Pontificia Univ Catolica Chile, Ctr Astro Engn, Santiago, Chile
[10] Kobe Univ, Fac Sci, Dept Earth & Planetary Sci, Nada Ku, Kobe, Hyogo 6578501, Japan
[11] Univ Tokyo, Sch Sci, Inst Astron, Kiso Observ, Kiso, Nagano 3970101, Japan
[12] Nagoya City Sci Museum, Naka Ku, Nagoya, Aichi 4600008, Japan
[13] Kagoshima Univ, Fac Sci, Kagoshima, Kagoshima 8908580, Japan
[14] Japan Sci & Technol Agcy, Ctr Low Carbon Soc Strategy, Chiyoda Ku, Tokyo 1020076, Japan
基金
美国国家航空航天局; 美国国家科学基金会; 日本学术振兴会;
关键词
atmospheric effects; infrared: general; instrumentation: detectors; site testing; OPTICAL/INFRARED ASTRONOMICAL QUALITY; INTEGRAL FIELD SPECTROSCOPY; PASCHEN-ALPHA SURVEY; MAUNA-KEA; STAR-FORMATION; FILTER SET; MAGELLANIC-CLOUD; WATER-VAPOR; EXTINCTION; GALAXIES;
D O I
10.1093/pasj/psu148
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We have developed a near-infrared camera called ANIR (Atacama Near-InfraRed camera) for the University of Tokyo Atacama Observatory 1.0 m telescope (miniTAO) installed at the summit of Cerro Chajnantor (5640 m above sea level) in the north of Chile. The camera provides a field of view of 5'.1 x 5'.1 with a spatial resolution of 0 ''.298 pixel(-1) in the wavelength range of 0.95 to 2.4 mu m, using Offner relay optics and a PACE HAWAII-2 focal plane array. Taking advantage of the dry site, the camera is capable of narrow-band imaging observations at the hydrogen Paschen-alpha (Pa alpha, lambda = 1.8751 mu m in air) wavelength ground-based observations of which have been quite difficult due to deep atmospheric absorption, mainly from water vapor. We have been successfully obtaining Pa alpha images of Galactic objects and nearby galaxies since the first-light observation in 2009 with ANIR. The throughputs at the narrow-band filters (N1875, N191) including the atmospheric absorption show larger dispersion (similar to 10%) than those at broad-band filters (a few percent), indicating that they are affected by temporal fluctuations in precipitable water vapor (PWV) above the site. We evaluate the PWV content via the atmospheric transmittance at the narrow-band filters, and deduce that the median and the dispersion of the distribution of the PWV are 0.40 +/- 0.30 and 0.37 +/- 0.21mm, for the N1875 and N191 data respectively, which are remarkably smaller (49% +/- 38% for N1875 and 59% +/- 26% for N191) than radiometry measurements at the base of Cerro Chajnantor (an altitude of 5100 m). The decrease in PWV can be explained by the altitude of the site when we assume that the vertical distribution of the water vapor is approximated at an exponential profile with scale heights within 0.3-1.9 km (previously observed values at night). We thus conclude that miniTAO/ANIR at the summit of Cerro Chajnantor indeed provides us an excellent capability for a ground-based Paa observation.
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页数:15
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