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Towards Determination of Galactic Rotation Curve through Phase- Referencing VLBI Observations of Astronomical Maser Sources

Research Project

Project/Area Number 10440065
Research Category

Grant-in-Aid for Scientific Research (B).

Allocation TypeSingle-year Grants
Section一般
Research Field Astronomy
Research InstitutionNational Astronomical Observatory (NAO)

Principal Investigator

SASAO Tetsuo  National Astronomical Observatory, Earth Rotation Division, Professor, 地球回転研究系, 教授 (20000177)

Co-Investigator(Kenkyū-buntansha) OKUDAIRA Atsuya  Kagoshima International University, Faculty of Sociology, Lecturer, 社会学部, 講師 (70289651)
MANABE Seiji  National Astronomical Observatory, Earth Rotation Division, Associate Professor, 地球回転研究系, 助教授 (30000178)
OMODAKA Toshihiro  Kagoshima University, Faculty of Science, Professor, 理学部, 教授 (50129285)
MIYOSHI Makoto  National Astronomical Observatory, Division of Earth Rotation, Assistant, 地球回転研究系, 助手 (50270450)
KAMEYA Osamu  National Astronomical Observatory, Mizusawa Astrogeodynamics Observatory, Assistant, 水沢観測センター, 助手 (70202025)
Project Period (FY) 1998 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥12,900,000 (Direct Cost: ¥12,900,000)
Fiscal Year 2000: ¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 1999: ¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 1998: ¥6,200,000 (Direct Cost: ¥6,200,000)
Keywordshigh-precision astrometry / phase-referencing VLBI / compensation of atmospheric phase fluctuations / astronomical maser source / rotation curve of the Galaxy / dark matter / project VERA / reference radio source
Research Abstract

VERA (VLBI Exploration of Radio Astronomy) is a new VLBI array of National Astronomical Observatory mainly aimed at study of the structure and dynamics of our Galaxy through high-precision phase-referencing VLBI astrometry of astronomical maser sources. The project was recently funded and the four station array is under construction. In the present study, we conducted 22 GHz switching phase-referencing VLBI observations of two pairs of Galactic water maser sources and adjacent extragalactic continuum radio sources using VLBA of NRAO as the first step towards determination of the rotation curve of the Galaxy outside the Solar Circle. The primary purpose of the study was to confirm basic concepts of VERA project on the basis of the real VLBI data and to prepare to VERA observations. The two pairs of radio sources were observed twice with a month interval in 1998 and 1999, respectively, in the fast-switching phase-referencing mode with 40 second switching cycle. Analyses of the observed results which were mainly performed by Kazuya Hachisuka, a graduate student of the head investigator, revealed
(1) the large fluctuation in the VLBI fringe phase due mostly to the water vapor in the turbulent troposphere was successfully compensated in the phase-referencing, and the residual fluctuation in 40-second-integrated phase difference observable was as small as 10 degrees (which corresponds to 50 microarcsecond angular precision with 2000 km projected baseline) ,
(2) celestial displacements of the two maser sources with assumed distances of roughly 7 kpc and 2 kpc, respectively, during a month were clearly detected for the first time, and the were mostly consistent with the expected proper motions due to the combained effects of the Galactic rotation, annual parallax and solar motion.
The results confirmed the eligibility of the phase-referencing VLBI observations with VERA in the high-precision maser astrometry with 10 microarcsecond-level accuracy.

Report

(4 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • 1998 Annual Research Report
  • Research Products

    (60 results)

All Other

All Publications (60 results)

  • [Publications] T.Sasao (Y.Asaki): "Phase Compensation Experiments with the Paired Antennas Method, 2, Millimeter-Wave Fringecorrection Using Centimeter-Wave Reference"Radio Science. 33・5. 1297-1318 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Sasao,A.Okudaira (T.Sasao): "Asia-Pacific Telescope 22GHz VLBI Experiment in October 1997"Proceedings of International Workshop on Geodetic Measurements by the Collocation of Space Techniques on Earth (GEMSTONE). 142-146 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] M.Miyoshi (J.R.Herrnstein): "VLBA Continuum Observations of NGC 4258 : Constraints on an Advection-dominated Accretion Flow"The Astrophysical Journal. 497. L69-L73 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] S.Manabe (S.Manabe): "Project VERA"Proceedings of International Workshop on Geodetic Measurements by the Collocation of Space Techniques on Earth (GEMSTONE). 197-199 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] O.Kameya (K.Tatematsu): "Molecular Cloud Cores in the Orion A Cloud. II. FCRAO CS (2-1) Data"The Astrophysical Journal, Supplement Series. 118. 517-539 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Omodaka,M.Miyoshi,T.Sasao (T.Omodaka): "The Enormous Outburst of the 7.9 km/s Water-Maser Feature in Orion KL"Publ.Astron.Soc.Japan. 51. 333-336 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] M.Miyoshi (J.R.Herrnstein): "A Geometric Distance to the Galaxy NGC4258 from Orbital Motions in a Nuclear Gas Disk"Nature. 400. 539-541 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] O.Kameya,T.Sasao,M.Miyoshi (H.Imai): "Kinematics and Distance of Water Masers in W3 IRS5"Astrophysical Journal. 538. 751-765 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] O.Kameya (S.Deguchi): "SiO Maser Survey of the Galactic Disk IRAS Sources. I.15 deg<l<25 deg, Near End of the Galactic Bar"Astrophysical Journal Supplement Series. 125. 257-276 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] O.Kameya (S.Deguchi): "SiO Maser Survey of the Galactic Disk IRAS Sources. II. |l|<-3 deg and |b|<-3 deg, the Galactic Center Area"Astrophysical Journal, Supplement Series. 128. 571-595 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] O.Kameya (S.Horiuchi): "Highly polarized emission from the bursting water maser in Orion-KL"Publ.Astron.Soc.Japan. 52. 545-550 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] M.Miyoshi,O.Kameya,S.Manabe,T.Sasao,T.Omodaka,A.Okudaira (M.Honma): "J-Net Galactic Plane Survey of VLBI Radio Sources for VLBI Exploration of Radio Astrometry (VERA)"Publ.Astron.Soc.Japan. 52. 631-643 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 笹尾哲夫,面高俊宏(西尾正則): "公衆回線を利用した実時間VLBI自己診断システムの開発"電子情報通信学会論文誌 B. J83-B,8. 1195-1202 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Sasao (H.Sudou): "Sub-Parsec-Scale Acceleration of the Radio Jet in the Powerful Radio Galaxy NGC 6251"Publ.Astron.Soc.Japan. 52. 989-995 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] O.Kameya,T.Sasao,M.Miyoshi (H.Imai): "Kinematics and Distance of Water Masers in W3 IRS5"F.Favata,A.A.Kaas and A.Wilson (eds.) Proceedings of 33rd ESLAB Symposium, Star Formation from the Small to Large Scale. 409-411 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Sasao,S.Manabe,O.Kameya,T.Omodaka (H.Kobayashi): "Start of VERA Project"Galaxies and their Constituents at the Highest Angular Resolution, International Astronomical Union. Symposium no.205. Manchester.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] O.Kameya (S.Deguchi): "SiO Maser Survey of the Galactic Disk IRAS Sources. III. -10 deg<l<15 deg and |b|<=3 deg, a Central Part of the Galaxy"Astrophysical Journal Supplement Series. 130. 351-379 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] M.Miyoshi (S.Iguchi): "Multi-Frequency VLBI Observations of OT 081"Publications of the Astronomical Society of Japan. 52. 1037-1044 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Omodaka (H.Kobayashi): "Monitoring of the Orion-KL Water Maser Outburst"H.Hirabayashi,P.G.Edwards and D.W.Murphy (eds.)Astrophysical Phenomena Revealed by Space VLBI, Proceedings of the VSOP Symposium. 109-112 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 奥平敦也: "LinuxによるディスクレスワークステーションI.カーネル2.0.xの場合"鹿児島国際大学社会学部論集. 19. 61-92 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Sasao (Y.Asaki): "Phase Compensation Experiments with the Paired Antennas Method, 2, Millimeter-Wave Fringcorrection Using Centimeter-Wave Reference"Radio Science. 33, 5. 1297-1318 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Sasao, A.Okudaira (T.Sasao): "Asia-Pacific Telescope 22GHz VLBI Experiment in October 1997"Proceedings of international Workshop on Geodetic Measurements by the Collocation of Space Techniques on Earth (GEMSTONE). 142-146 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] M.Miyoshi, (J.R.Herrnstein): "VLBA Continuum Observations of NGC 4258 : Constraints on an Advection-dominated Accretion Flow"The Astrophysical Journal. 497. L69-L73 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] S.Manabe: "Project VERA"Proceedings of International Workshop on Geodetic Measurements by the Collocation of Space Techniques on Earth (GEMSTONE). 197-199 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] O.Kameya (K.Tatematsu): "Molecular Cloud Cores in the Orion A Cloud. II.FCRAO CS (2-1) Data"The Astrophysical Journal, Supplements Series. 118. 517-539 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Omodaka, M.Miyoshi, T.Sasao (T.Omodaka): "The Enormous Outburst of the 7.9 km/s Water-Maser Feature in Orion KL"Publ.Astron.Soc.Japan. 51. 333-336 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] M.Miyoshi, (J.R.Herrnstein): "A Geometric Distance to the Galaxy NGC4258 from Orbital Motions in a Nuclear Gas Disk"Nature. 400. 539-541 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] O.Kameya, T.Sasao, M.Miyoshi (H.Imai): "Kinematics and Distance of Water Masers in W3 IRS5"Astrophysical Journal. 538. 751-765 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] O.Kameya, (S.Horiuchi): "Highly Polarized Burst of a Water Maser in Orion-KL"Publ.Astron.Soc.Japan. 52. 545-550 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] O.Kameya (S.Deguchi): "SiO Maser Survey of the Galactic Disk IRAS Sources. I.15 deg < 1 < 25 deg, Near End of the Galactic Bar"Astrophysical Journal, Supplement Series. 125. 257-276 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] O.Kameya(S.Deguchi): "SiO Maser Survey of the Galactic Disk IRAS Sources. II.|1|<-3 deg and |b|<-3 deg, the Galactic Center Area"Astrophysical Journal, Supplement Series. 128. 571-595 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] M.Miyoshi, O.Kameya, S., Manabe, T.Sasao, T.Omodaka, A.Okudaira (M.Honma): "J-Net Galactic Plane Survey of VLBI Radio Sources for VLBI Exploration of Radio Astrometry (VERA)"Publ.Astron.Soc.Japan. 52. 631-643 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Sasao, T.Omodaka, (M.Nishio): "Development of a Self Diagnosis System for Real-Time VLBI Using Public Communication Lines (in Japanese)"Transactions of The Institute of Electronics, Information and Communication Engineers B. J83-B, 8. 1195-1202 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Sasao(H.Sudou): "Sub-Parsec-Scale Acceleration of the Radio Jet in the Powerful Radio Galaxy NGC 6251"Publ.Astron.Soc.Japan. 52. 989-995 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] O.Kameya, T.Sasao, M.Miyoshi (H.Imai): "Kinematics and Distance of Water Masers in W3 IRS5"F.Favata, A.A.Kaas and A.Wilson (eds.) : Proceeding of 33rd ESLAB Symposium, Star Formation from the Small to Large Scale. 409-411 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Sasao, S.Manabe, O.Kameya, T.Omodaka (H.Kobayashi): "Start of VERA Project"Galaxies and their Constituents at the Highest Angular Resolution, International Astronomical Union.Symposium no.205. Manchester..

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] O.Kameya (S.Deguchi): "SiO Maser Survey of the Galactic Disk IRAS Sources. III.-10 deg<1<15 deg and |b|<=3 deg, a Central Part of the Galaxy"Astrophysical Journal Supplement Series. 130. 351-379 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] M.Miyoshi (S.Iguchi): "Multi-Frequency VLBI Observations of OT 081"Publications of the Astronomical Society of Japan. 52. 1037-1044 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] T.Omodaka (H.Kobayashi): "Monitoring of the Orion-KL Water Maser Outburst"H.Hirabayashi, P.G.Edward and D.W.Murphy (eds.) : Astrophysical Phenomena Revealed by Space VLBI, Proceedings of the VSOP Symposium. 109-112 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] A.Okudaira: "A Diskless Workstation with Linux I.A Case for Kernel 2.0.x (in Japanese)"Publications of the Faculty of Sociology, Kagoshima International University. 19. 61-92 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] M.Miyoshi,O.Kameya,S.Manabe,T.Sasao,T.Omodaka,A.Okudaira(M.Honma): "J-Net Galactic Plane Survey of VLBI Radio Sources for VLBI Exploration of Radio Astrometry(VERA)."Publ.Astron.Soc.Japan. 52. 631-643 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 笹尾哲夫,面高俊宏(西尾正規): "公衆回線を利用した実時間VLBI自己診断システムの開発"電子情報通信学会論文誌 B. J83-B,8. 1195-1202 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Sasao (H.Sudou): "Sub-Parsec-Scale Acceleration of the Radio Jet in the Powerful Radio Galaxy NGC 6251"Publ.Astron.Soc.Japan. 52. 989-995 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] O.Kameya,T.Sasao,M.Miyoshi(H.Imai): "Kinematics and Distance of Water Masers in W3 IRS5"F.Favata,A.A.Kaas and A.Wilson(eds.)Proceedings of 33rd ESLAB Symposium, Star Formation from the Small to Large Scale. 409-411 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Sasao,S.Manabe,O.Kameya,T.Omodaka(H.Kobayashi): "Start of VERA Project"Galaxies and their Constituents at the Highest Angular Resolution, International Astronomical Union. Symposium no.205.Manchester.

    • Related Report
      2000 Annual Research Report
  • [Publications] O.Kameya(S.Deguchi): "SiO Maser Survey of the Galactic Disk IRAS Sources. III. -10 deg<1<15 deg and |b|<=3 deg, a Central Part of the Galaxy"Astrophysical Journal Supplement Series. 130. 351-379 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] M.Miyoshi(S.Iguchi): "Multi-Frequency VLBI Observations of OT 081"Publications of the Astronomical Society of Japan. 52. 1037-1044 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Omodaka(H.Kobayashi): "Monitoring of the Orion-KL Water Maser Outburst "H.Hirabayashi,P.G.Edwards and D.W.Murphy(eds.) Astrophysical Phenomena Revealed by Space VLBI, Proceedings of the VSOP Symposium. 109-112 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 奥平敦也: "LinuxによるディスクレスワークステーションI.カーネル2.0.xの場合"鹿児島国際大学社会学部論集. 19. 61-92 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] T. Omodaka, M. Miyoshi, T. Sasao: "The Enormous Outburst of the 7.9km/s Water-Maser Feature in Orion KL"Publ. Astron. Soc. Japan. 51. 333-336 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] M. Miyoshi (J.R. Herrnstein): "A Geometric Distance to the Galaxy NGC4258 from Orbital Motions in a Nuclear Gas Disk"Nature. 400. 539-541 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] O. Kameya, T. Sasao, M. Miyoshi (H. Imai): "Kinematics and Distance of Water Masers in W3 IRS5"Astrophysical Journal. (印刷中). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] O. Kameya (S. Deguchi): "SiO Maser Survey of the Galactic Disk IRAS Sources. I. 15 deg < 1 < 25 deg, Near End of the Galactic Bar"Astrophysical Journal Supplement Series. 125. 257-276 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] O. Kameya (S. Deguchi): "SiO Maser Survey of the Galactic Disk IRAS Sources. I.I. |1|< -3 deg and |b|< -3 deg, the Galactic Center Area"Astrophysical Journal, Supplement Series. (印刷中). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] O. Kameya (S. Horiuchi): "Highly polarized emission from the bursting water maser in Orion-KL"Publ. Astron. Soc. Japan. (印刷中). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] T. Sasao (Y. Asaki): "Phase Compensation Experiments with the Paired Antennas Method. 2. Millimeter-Wave Fringecorrection Using Centimeter-Wave Reference" Radio Science. 33・5. 1297-1318 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] T. Sasao: "Asia-Pacific Telescope 22GHz VLBI Experiment in October 1997" Proceedings of International Workshop on Geodetic Mesurements by the Collocation of Space Techniques on Earth (GEMSTONE). (印刷中). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] M. Miyoshi (J.R.Herrnstein): "VLBA Continuum Observations of NGC 4258:Constraints on an Advection-dominated Accretion Flow" The Astrophysical Journal. 497. L69-L73 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] S. Manabe: "Project VERA" Proceedings of International Workshop on Geodetic Measurements by the Collocation of Space Techniques on Earth (GEMSTONE). (印刷中). (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] O. Kameya (K. Tatematsu): "Molecular Cloud Cores in the Orion A Cloud. II. FCRAO CS (2-1) Data" The Astrophysical Journal. Supplement Series. 118. 517-539 (1998)

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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