Current status and future plan of Osaka Prefecture University 1.85-m mm-submm telescope project

Atsushi Nishimura; Kazuki Tokuda; Ryohei Harada; Yutaka Hasegawa; Shota Ueda; Sho Masui; Ryotaro Konishi; Yasumasa Yamasaki; Hiroshi Kondo; Koki Yokoyama; Takeru Matsumoto; Taisei Minami; Masanari Okawa; Shinji Fujita; Ayu Konishi; Yuka Nakao; Shimpei Nishimoto; Sana Kawashita; Sho Yoneyama; Tatsuyuki Takashima; Kenta Goto; Nozomi Okada; Kimihiro Kimura; Yasuhiro Abe; Kazuyuki Muraoka; Hiroyuki Maezawa; Toshikazu Onishi; Hideo Ogawa

doi:10.1117/12.2560955

13 December 2020 Current status and future plan of Osaka Prefecture University 1.85-m mm-submm telescope project

Atsushi Nishimura, Kazuki Tokuda, Ryohei Harada, Yutaka Hasegawa, Shota Ueda, Sho Masui, Ryotaro Konishi, Yasumasa Yamasaki, Hiroshi Kondo, Koki Yokoyama, Takeru Matsumoto, Taisei Minami, Masanari Okawa, Shinji Fujita, Ayu Konishi, Yuka Nakao, Shimpei Nishimoto, Sana Kawashita, Sho Yoneyama, Tatsuyuki Takashima, Kenta Goto, Nozomi Okada, Kimihiro Kimura, Yasuhiro Abe, Kazuyuki Muraoka, Hiroyuki Maezawa, Toshikazu Onishi, Hideo Ogawa

Author Affiliations +

Proceedings Volume 11445, Ground-based and Airborne Telescopes VIII; 114457F (2020) https://doi.org/10.1117/12.2560955
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

We report the current status of the 1.85-m mm-submm telescope installed at the Nobeyama Radio Observatory (altitude 1400 m) and the future plan. The scientific goal is to reveal the physical/chemical properties of molecular clouds in the Galaxy by obtaining large-scale distributions of molecular gas with an angular resolution of several arcminutes. A semi-automatic observation system created mainly in Python on Linux-PCs enables effective operations. A large-scale CO J =2–1 survey of the molecular clouds (e.g., Orion-A/B, Cygnus-X/OB7, Taurus- California-Perseus complex, and Galactic Plane), and a pilot survey of emission lines from minor molecular species toward Orion clouds have been conducted so far. The telescope also is providing the opportunities for technical demonstrations of new devices and ideas. For example, the practical realizations of PLM (Path Length Modulator) and waveguide-based sideband separating filter, installation of the newly designed waveguide-based circular polarizer and OMT (Orthomode Transducer), and so on. As the next step, we are now planning to relocate the telescope to San Pedro de Atacama in Chile (altitude 2500 m), and are developing very wideband receiver covering 210–375 GHz (corresponding to Bands 6–7 of ALMA) and full-automatic observation system. The new telescope system will provide large-scale data in the spatial and frequency domain of molecular clouds of Galactic plane and Large/Small Magellanic Clouds at the southern hemisphere. The data will be precious for the comparison with those of extra-galactic ones that will be obtained with ALMA as the Bands 6/7 are the most efficient frequency bands for the surveys in extra-galaxies for ALMA.

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Atsushi Nishimura, Kazuki Tokuda, Ryohei Harada, Yutaka Hasegawa, Shota Ueda, Sho Masui, Ryotaro Konishi, Yasumasa Yamasaki, Hiroshi Kondo, Koki Yokoyama, Takeru Matsumoto, Taisei Minami, Masanari Okawa, Shinji Fujita, Ayu Konishi, Yuka Nakao, Shimpei Nishimoto, Sana Kawashita, Sho Yoneyama, Tatsuyuki Takashima, Kenta Goto, Nozomi Okada, Kimihiro Kimura, Yasuhiro Abe, Kazuyuki Muraoka, Hiroyuki Maezawa, Toshikazu Onishi, and Hideo Ogawa "Current status and future plan of Osaka Prefecture University 1.85-m mm-submm telescope project", Proc. SPIE 11445, Ground-based and Airborne Telescopes VIII, 114457F (13 December 2020); https://doi.org/10.1117/12.2560955

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