Development of a 22 GHz receiver for Yamaguchi 32-m radio telescope

2010 Fiscal Year Final Research Report

• Project/Area Number: 20340045
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Astronomy
• Research Institution: Yamaguchi University
• Principal Investigator: FUJISAWA Kenta Yamaguchi University, 時間学研究所, 教授 (70311181)
• Project Period (FY): 2008 – 2010
• Keywords: 電波天文学 / 受信機 / VLBI / 観測網 / メーザ

Research Abstract

We have developed a cooled low-noise receiver at 22 GHz, which is an important observational frequency of the East-Asian VLBI Network. The 22 GHz receiver is composed of a cooled-polarizer, two Low Noise Amplifiers (LNA) for receiving dual polarization simultaneously, mixers and two amplifiers, and back-end. A unique calibration system using a small hole for noise injection is adopted. This hole is also used for drying the waveguide. The noise temperature of the LNA is about 25 K. Since the polarizer is also cooled with the LNAs, the receiver noise temperature of below 45 K was achieved.

Research Products

• [Journal Article] Internal Proper Motions of Methanol Masers at 6.7GHz in Massive Star-Forming Region Onsala 1 (2011)
  • Author(s): Sugiyama, Koichiro, Fujisawa, Kenta, Doi, Akihiro, Honma, Mareki, Isono, Yasuko, Kobayashi, Hideyuki, Mochizuki, Nanako, Murata, Yasuhiro, Sawada-Satoh, Satoko, Wajima, Kiyoaki
  • Journal Title: Publications of the Astronomical Society of Japan Vol.63, No.1 Pages: 53-61
  • Peer Reviewed
• [Journal Article] Cyg X-3 is flaring in radio (2011)
  • Author(s): Kotani, Taro, Miyazaki, Atsushi, Tsuboi, Masato, Endo, Wataru, Fujisawa, Kenta, Kawai, Nobuyuki, Kuno, Nario, Nakanishi, Kouichiro, Yamaoka, Kazutaka, Yonekura, Yoshinori
  • Journal Title: The Astronomer's Telegram #3130
• [Journal Article] VLBI Monitoring of 3C 84 (NGC 1275) in Early Phase of the 2005 Outburst (2010)
  • Author(s): Nagai, Hiroshi, Suzuki, Kenta, Asada, Keiichi, Kino, Motoki, Kameno, Seiji, Doi, Akihiro, Inoue, Makoto, Kataoka, Jun, Bach,Inoue, Makoto, Kataoka, Jun, Bach, Uwe, Hirota, Tomoya, Matsumoto, Naoko, Honma, Mareki, Kobayashi, Hideyuki, Fujisawa, Kenta
  • Journal Title: Publications of the Astronomical Society of Japan Vol.62, No.2 Pages: L11-L15
  • Peer Reviewed
• [Journal Article] Multi-wavelength photometric and polarimetric observations of the outburst of 3C 454.3 in Dec.2009 (2010)
  • Author(s): Sasada, Mahito, Uemura, Makoto, Fukazawa, Yasushi, Kawabata, Koji, Takahashi, H., Itoh, R., Ohsugi, T., Yoshida, M., Yamanaka, M., Sato, S., Kino, M., Fujisawa, K., Kadota, A., Kataoka, J., Kawai, N., Kuroda, D., Yanagisawa, K., Imada, A., Ohta, K., Sakon, I.
  • Journal Title: 38th COSPAR Scientific Assembly. in Bremen, Germany Pages: 5
• [Journal Article] The VLBI Group At Geographical Survey Institute,, Asano, Shoichiro, Uose, Hisao "VLBI Detections of Parsec-Scale Nonthermal Jets in Radio-Loud Broad Absorption Line Quasars" (2009)
  • Author(s): Doi, Akihiro, Kawaguchi, Noriyuki, Kono, Yusuke, Oyama, Tomoaki, Fujisawa, Kenta, Takaba, Hiroshi, Sudou, Hiroshi, Wakamatsu, Ken-Ichi, Yamauchi, Aya, Murata, Yasuhiro, Mochizuki, Nanako, Wajima, Kiyoaki, Omodaka, Toshihiro, Nagayama, Takumi, Nakai, Naomasa, Sorai, Kazuo, Kawai, Eiji, Sekido, Mamoru, Koyama, Yasuhiro
  • Journal Title: Publications of the Astronomical Society of Japan Vol.61, No.6 Pages: 1389-1398
  • Peer Reviewed
• [Journal Article] "The Kinematics of the Methanol Maser at 6.7GHz in Cepheus A" Approaching Micro-Arcsecond Resolution with VSOP-2 (2009)
  • Author(s): Sugiyama, K., Fujisawa, K., Wajima, K., Sawada-Satoh, S., Isono, Y., Honma, M., Murata, Y., Mochizuki, N., Doi, A.
  • Journal Title: Astrophysics and Technologies ASP Conference Series (Edited by Yoshiaki Hagiwara, Ed Fomalont, Masato Tsuboi, and Yasuhiro Murata.) Vol.402 Pages: 392
• [Journal Article] H2O Maser Outflow from the Red Supergiant Star NML Cygni Observed with Japanese VLBI Network (2008)
  • Author(s): Nagayama, Takumi, Takeda, Koji, Omodaka, Toshihiro, Imai, Hiroshi, Kameno, Seiji, Sofue, Yoshiaki, Doi, Akihiro, Fujisawa, Kenta, Habe, Asao, Honma, Mareki, Kawaguchi, Noriyuki, Kawai, Eiji, Kobayashi, Hideyuki, Koyama, Yasuhiro, Murata, Yasuhiro, Sorai, Kazuo, Sudou, Hiroshi, Takaba, Hiroshi, Tamura, Sayaka, Wakamatsu, Ken-Ichi
  • Journal Title: Publications of the Astronomical Society of Japan Vol.60, No.5 Pages: 1069-1075
  • Peer Reviewed
• [Journal Article] A Synchronized Variation of the 6.7GHz Methanol Maser in Cepheus A (2008)
  • Author(s): Sugiyama, Koichiro, Fujisawa, Kenta, Doi, Akihiro, Honma, Mareki, Isono, Yasuko, Kobayashi, Hideyuki, Mochizuki, Nanako, Murata, Yasuhiro
  • Journal Title: Publications of the Astronomical Society of Japan Vol.60, No.5 Pages: 1001-1006
  • Peer Reviewed
• [Journal Article] Microstructure and kinematics of H2O masers in the massive star-forming region IRAS 06061+2151 (2008)
  • Author(s): Motogi, K., Watanabe, Y., Sorai, K., Habe, A., Honma, M., Imai, H., Yamauchi, A., Kobayashi, H., Fujisawa, K., Omodaka, T., Takaba, H., Shibata, K. M., Minamidani, T., Wakamatsu, K., Sudou, H., Kawai, E., Koyama, Y.
  • Journal Title: Monthly Notices of the Royal Astronomical Society Volume 390, Issue 2 Pages: 523-534
  • Peer Reviewed
• [Journal Article] A radio flare of a microquasar Cyg X-3 (2008)
  • Author(s): Fujisawa, Kenta, Tsuboi, Masato, Trushkin, Sergei, Kotani, Taro
  • Journal Title: The Astronomer's Telegram #1838
• [Presentation] 茨城・上海を含む東アジアVLBI観測網によるメタノール・メーザ観測 (2011)
  • Author(s): 藤沢健太、杉山孝一郎、蜂須賀一也、米倉覚則、土居明広、望月奈々子、澤田佐藤聡子、元木業人、小川英夫
  • Organizer: 日本天文学会2011年春季年会
  • Place of Presentation: 茨城,筑波大学
  • Year and Date: 2011-03-16
• [Presentation] RECENT RESULTS AND FUTURE PLAN OF THE JAPANESE VLBI NETWORK (2010)
  • Author(s): 藤沢健太
  • Organizer: 2010 Asia-Pacific Radio Science Conference (AP-RASC'10)
  • Place of Presentation: Toyama International Conference Center, Toyama
  • Year and Date: 2010-09-23
• [Presentation] 大質量星形成領域G12.71-0.11のメタノール・メーザが示す激しい強度変動 (2010)
  • Author(s): 藤沢健太、青木望
  • Organizer: 日本天文学会2010年秋季年会
  • Place of Presentation: 金沢,金沢大学
  • Year and Date: 2010-09-22
• [Presentation] 山口32m電波望遠鏡の22GHz冷却受信機 (2010)
  • Author(s): 藤沢健太
  • Organizer: 日本天文学会2010年春季年会
  • Place of Presentation: 広島,広島大学
  • Year and Date: 2010-03-24
• [Presentation] 山口32m電波望遠鏡計画の経過報告と将来計画 (2009)
  • Author(s): 藤沢健太
  • Organizer: 日本天文学会2009年秋季年会
  • Place of Presentation: 山口,山口大学
  • Year and Date: 2009-09-14
• [Presentation] ほか大学VLBI連携観測グループ大学VLBI連携観測の現状について (2009)
  • Author(s): 藤沢健太
  • Organizer: 日本天文学会2009年春季年会
  • Place of Presentation: 大阪,大阪府立大学
  • Year and Date: 2009-03-24
• [Presentation] Japanese VLBI Network : recent results and future plan for EAVN (2009)
  • Author(s): 藤沢健太
  • Organizer: 2009 East Asia VLBI Workshop
  • Place of Presentation: Seoul, Korea
  • Year and Date: 2009-03-18
• [Presentation] 山口大学研究グループ6.7GHzメタノール・メーザの長期的変動 (2008)
  • Author(s): 藤沢健太、石川裕子、澤田昭浩、杉山孝一郎
  • Organizer: 日本天文学会2008年秋季年会
  • Place of Presentation: 岡山,岡山理科大学
  • Year and Date: 2008-09-11
• [Remarks] ホームページ等
• [Remarks] (1)大学VLBI連携のホームページ
  • URL: http://www.astro.sci.yamaguchi-u.ac.jp/~kenta/jvnhp/index.html
• [Remarks] (2)研究成果を公表しているホームページ
  • URL: http://www.sci.yamaguchi-u.ac.jp/phy/astro/index.html