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Antarctic 10-m Terahertz Telescope Project PDF

37 Pages·2015·10.6 MB·English
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Antarctic 10‐m Terahertz Telescope Project Nario Kuno University of Tukuba Naomasa Nakai1, Masumichi Seta2, Tom Nitta1, Makoto Nagai1,  Hiroaki Imada1, Yutaro Sekimoto3, Kazuo Sorai4 and Antarctic astronomy consortium 1University of Tsukuba. 2Kwansei Gakuin University. 3National Astronomical Observatory of Japan. 4Hokkaido University. Outline 1. Astronomy from Antarctica 2. Antarctic 10‐m Terahertz Telescope Project 2.1 Science targets 2.2 Specifications of 10‐m telescope 2.3 Schedule 1. Astronomy from Antarctica Plateau of Antarctica (>3000m) ⇒ Good place for astronomical observations Dome F (3810m) (Japan) Ridge A (4050m) (USA) Dome A (4090m) (China) Dome C (3230m) (France & Italy) South Pole (2835m) (USA) Advantages of Antarctica for Astronomy (1) • Temperature is lowest on Earth @Dome Fuji (Yamauchi et al. 2003) ⇒ Infrared sky background is lowest (2.2‐30μm) Advantages of Antarctica for Astronomy (2) • Temperature is lowest on Earth ⇒ Precipitable water vapor (PWV) is lowest Station PWV Winter 25% Winter 50% Dome A 0.10 mm 0.14 mm Dome C 0.15 0.24 South Pole 0.23 0.32 Chajnantor 0.35 0.60 (Chile) Mauna Kea 1.0 1.5 (W. Saunders, et al. 2009 PASP 121, 976) (H.Yang, et al. 2010 PASP 122, 490) ⇒ Most transparent sky (3μm‐3mm) 6 Sky transmission (calculations) Submm THz 300μm 150μm 100μm 60μm Wave length Dome Fuji 200K, 0.10mm Winter 25% Dome Fuji 200K, 0.14mm Winter 50% Optical depth =1 Frequency Mauna Kea Chajnantor(Chile) 270K, 1.5mm 260K, 0.60mm 7 Winter 50% Advantages of Antarctica for Astronomy (3) • High stability of the sky background Chajnantor Chile (5000 m)   h t South pole p e d (2840 m)   l a c i t p O Mauna Kea Hawaii (4000 m) 8 860 GHz = 350 μm (Peterson etc 2003 PASP 115, 383) Advantages of Antarctica for Astronomy (4) • Wind is not strong (Wind degrades pointing accuracy of telescope) Syowa:6.5m/s Dome Fuji Chile(5000m): Average 6.1m Asuka F 13m/s Dome Fuji F 5.8m/s Wind speed (m/s) ⇒ Good telescope pointing  9 Antarctica Dome F (3810m) (Japan) Ridge A (4050m) (USA) Dome A (4090m) (China) Dome C (3230m) (France & Italy) South Pole (2835m) *Concordia Station (USA)

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Antarctic 10-m Terahertz Telescope Project. Nario Kuno Wave length. Sky transmission (calculations). THz. Submm. Winter 25% summer camp »).
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