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Yonekura, Yoshinori; Saito, Yu; Sugiyama, Koichiro; Soon, Kang Lou; Momose, Munetake; Yokosawa, Masayoshi; Ogawa, Hideo; Kimura, Kimihiro; Abe, Yasuhiro; Nishimura, Atsushi; Hasegawa, Yutaka; Fujisawa, Kenta; Ohyama, Tomoaki; Kono, Yusuke; Miyamoto, Yusuke; Sawada-Satoh, Satoko; Kobayashi, Hideyuki; Kawaguchi, Noriyuki; Honma, Mareki; Shibata, Katsunori M; Sato, Katsuhisa; Ueno, Yuji; Jike, Takaaki; Tamura, Yoshiaki; Hirota, Tomoya; Miyazaki, Atsushi; Niinuma, Kotaro; Sorai, Kazuo; Takaba, Hiroshi; Hachisuka, Kazuya; Kondo, Tetsuro; Sekido, Mamoru; Murata, Yasuhiro; Nakai, Naomasa; Omodaka, Toshihiro
Publications of the Astronomical Society of Japan, 10/2016, Letnik: 68, Številka: 5Journal Article
Abstract The Hitachi and Takahagi 32 m radio telescopes (former satellite communication antennas) were so upgraded as to work at 6, 8, and 22 GHz. We developed the receiver systems, IF systems, back-end systems (including samplers and recorders), and reference systems. We measured the performance of the antennas. The system temperature including the atmosphere toward the zenith, $T_{\rm sys}^{\ast }$ , is measured to be ∼30–40 K for 6 GHz and ∼25–35 K for 8 GHz. $T_{\rm sys}^{\ast }$ for 22 GHz is measured to be ∼40–100 K in winter and ∼150–500 K in summer seasons, respectively. The aperture efficiency is 55%–75% for Hitachi at 6 GHz and 8 GHz, and 55%–65% for Takahagi at 8 GHz. The beam sizes at 6 GHz and 8 GHz are ∼4 ${^{\circ}_{.}}$ 6 and ∼3 ${^{\circ}_{.}}$ 8, respectively. The side-lobe level is less than 3%–4% at 6 and 8 GHz. Pointing accuracy was measured to be better than ∼0 ${^{\circ}_{.}}$ 3 for Hitachi and ∼0 ${^{\circ}_{.}}$ 6 for Takahagi. We succeeded in VLBI observations in 2010 August, indicating good performance of the antenna. We started single-dish monitoring observations of 6.7 GHz methanol maser sources in 2012 December, and found several new sources showing short-term periodic variation of the flux density.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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