Unbiased AGN Survey by using the Optical Fiber Connected VLBI Array

• Project/Area Number: 15340068
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Astronomy
• Research Institution: National Astronomical Observatory of Japan
• Principal Investigator: KAWAGUCHI Noriyuki National Astronomical Observatory of Japan, 電波研究部, Professor (90214618)
• Co-Investigator(Kenkyū-buntansha): KONO Yusuke National Astronomical Observatory, Division of Radio Astronomy, Associate Professor (00370106) ; MURATA Yasuhiro National Astronomical Observatory, Institute of Space Astronautics, Sciences, Associate Professor (70249936) ; FUJISAWA Kenta Yamaguchi University, 理学部, Associate Professor (70311181) ; TAKAHA Hiroshi Gifu University, 工学部, Associate Professor (90293539) ; YASUDA Shigeru Kagoshima University, 工学部, Research Assistant (30253909) ; 小林 秀行 国立天文台, 電波研究部, 教授 (20211906) ; 真鍋 盛二 国立天文台, 電波研究部, 教授 (30000178)
• Project Period (FY): 2003 – 2006
• Project Status: Completed (Fiscal Year 2006)
• Budget Amount: ¥15,900,000 (Direct Cost: ¥15,900,000); Fiscal Year 2006: ¥2,500,000 (Direct Cost: ¥2,500,000); Fiscal Year 2005: ¥4,800,000 (Direct Cost: ¥4,800,000); Fiscal Year 2004: ¥4,200,000 (Direct Cost: ¥4,200,000); Fiscal Year 2003: ¥4,400,000 (Direct Cost: ¥4,400,000)
• Keywords: Fiber Connected VLBI / eVLBI / AGN / QSO / HiZ / BAL / YSO / Radio Imaging / 超長基線電波干渉計 / 電波天文学 / 位置天文学 / 超高速情報処理 / 超精密計測 / 超高感度 / 実時間情報処理 / 超高速通信回線 / スーパーSINET / 測地 / 光結合 / 電波干渉計 / VLBI / IDV天体 / 岐阜大学11m望遠鏡 / 臼田64m望遠鏡 / つくば32m望遠鏡

Research Abstract

This study has started by aiming at obtaining VLBI survey observations on a fiber connected radio telescopes, Usuda 64-m and Tsukuba 34-m antennas. By the limitation of the pointing capability of above antennas towards radio sources, the transit observation of sources is only a way of surveying AGNs, Active Galactic Nuclei. The Super SINET project lead by NII, the National Institute of Informatics, however, makes possible much more number of participant stations, Gifu 11-m and Yamaguchi 32-m radio telescopes. The JGN, Japan Gigabit Network, operated by NICT, National Institute of Communication Technologies, connected the Kashima-34m telescope to the realtime VLBI network. Also remarkable advancements on the telescope operation was performed for those telescope to drive the antenna towards a target radio source for a several hours. Thus more advanced studies for AGN survey became possible, such as Hi-Z sources and BAL Quasars.
Hi-Z galaxies, z larger than 4, were surveyed and at least 4 sources were detected. Among them, 1713+215 (z=4.011) shows the extended structure resolved on the baseline between Yamaguchi and Kashima (851 km in length). Other three objects are all compact and not resolved on the optical connected array formed for this study. The 0906+693 is 4 times more brighter than the 1713+215 though it has larger z, z=5.47, and located further than 1713+215. The 17 BAL quasars were observed and 14 sources detected. Among the detected BAL quasars, the 1405+410 shows the high activity in the core showing a flat spectrum. By using the highly sensitive and high resolution array, other interesting astronomical objects, such as YSO, Young Stellar Objects, has started to be observed. Also high quality imaging observation was also started Until 2006, the publications are limited only for engineering issues, but from now on many scientific publications relating above observations are highly expected.

Research Products

• [Journal Article] Bigradient Phase Referencing (2007)
  • Author(s): Doi, A., Fujisawa, K., Habe, A., Honma, M., Kawaguchi, N., Kobayashi, H., Murata, Y., Omodaka, T., Sudou, H., Takaba, H.
  • Journal Title: Pubrications of the Astronomical Society of Japan 58 Pages: 777-785
  • NAID: 10023942532
• [Journal Article] Bigradient Phase Referencing (2006)
  • Author(s): Akihiro Doi, Kenta Flljisawa, Asao Habe, Mareki Honma, Noriyuki Kawaguchi, et. al.
  • Journal Title: Publ., Astron., Soc., Japan 58 Pages: 777-777
  • NAID: 10023942532
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Publ. Astron. (2006)
  • Author(s): Akihiro fbi, Kenta Fujisawa, Asao Habe, Mareki Honina, Noriyuki Kawaguchi, et. al.
  • Journal Title: Soc. of Japan vol. 58 Pages: 777-777
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Gigabit Digital Filter Bank : Digital Backend Subsystem in the VERA Data-Acquisition System (2005)
  • Author(s): S.Iguchi, T.Kurayama, N.Kawaguchi, K.Kawakami
  • Journal Title: Publ.Astron.Soc.Japan 57 Pages: 259-271
  • NAID: 10023936511
• [Journal Article] An Ip based Realtime VLBI Observation Testbed with Multiple STM-16c Links (2004)
  • Author(s): Teruyuki Hasegawa, Toru Hasegawa, NoriyukiKawaguchi, Kenta Flljisawa, Kazuhiro Takashima, Hisao Uose, Shoichiro Asano
  • Journal Title: IEICE Trans.COMMUN. E87-B Pages: 651-651
  • NAID: 110003222271
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] An IP based Realtinie VLBI Observation Testbed with Multiple STM-16c Links (2004)
  • Author(s): Teruyuki Hasegawa, Toru Hasegawa, Noriyuki Kawaguchi, Kenta Fuiisawa, Kazuhiro Takashinia, Hisao Uose, Shoichiro Asano
  • Journal Title: IEICE Trans. COMMUN. vol. E87-B Pages: 651-651
  • Description: 「研究成果報告書概要(欧文)」より
• [Patent(Industrial Property Rights)] 超高速AD変換におけるビットアライメント補正機構 (2007)
  • Inventor(s): 川口 則幸, 河野 裕介, 川上 和幸, 上田 真也, 小関 研介
  • Industrial Property Rights Holder: 川口 則幸, 河野 裕介, 川上 和幸, 上田 真也, 小関 研介
  • Filing Date: 2007-04-03
  • Description: 「研究成果報告書概要(和文)」より
• [Patent(Industrial Property Rights)] 超高速AD変換におけるビットアライメント補正機構 (2007)
  • Inventor(s): 川口則幸他4名
  • Industrial Property Rights Holder: 川口則幸他4名
  • Filing Date: 2007-04-03
• [Publications]