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

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

doi:10.1117/12.2560955

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“…Recent progress in the development of mm and sub-mm receivers for the ALMA is outstanding, and the receivers having a wide bandwidth of the observed frequency adopting the 2SB technique are realized as well as the receiver noise temperatures which are close to the quantum limitation. Some of those technologies are applied for the receivers of single dish telescopes, and the powerful receiver systems, such as T100 6 and TZ 7 for Nobeyama 45-m telescope and the 230 GHz receiver for the 1.85-m telescope, 8,9 were developed. For further improvement of the survey capability, the FOREST receiver 10 was developed which is equipped with eight 2SB SIS mixers and were used to observe 4 beams with dual polarizations simultaneously, and 10 deg 2 scale mapping observations with an angular resolution of ∼ 15 became available.…”

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confidence: 99%

Development of the new multi-beam receiver and telescope control system for NASCO

Nishimura

Ohama²,

Kimura³

et al. 2020

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We report the current status of the NASCO (NAnten2 Super CO survey as legacy) project which aims to provide all-sky CO data cube of southern hemisphere using the NANTEN2 4-m submillimeter telescope installed at the Atacama Desert through developing a new multi-beam receiver and a new telescope control system. The receiver consists of 5 beams. The four beams, located at the four corners of a square with the beam separation of 720 , are installed with a 100 GHz band SIS receiver having 2-polarization sideband-separation filter. The other beam, located at the optical axis, is installed with a 200 GHz band SIS receiver having 2-polarization sideband-separation filter. The cooled component is modularized for each beam, and cooled mirrors are used. The IF bandwidths are 8 and 4 GHz for 100 and 200 GHz bands, respectively. Using XFFTS spectrometers with a bandwidth of 2 GHz, the lines of 12 CO, 13 CO, and C 18 O of J=1−0 or J=2−1 can be observed simultaneously for each beam. The control system is reconstructed on the ROS architecture, which is an open source framework for robot control, to enable a flexible observation mode and to handle a large amount of data. The framework is

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