1996 Fiscal Year Final Research Report Summary
The VLBI Observations of Astronomical Sources by using The Japanese VLBI network.
| Project/Area Number |
06302017
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 総合 |
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| Research Field |
Astronomy
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| Research Institution | Kagoshima University |
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Principal Investigator |
OMODAKA Toshihiro College of Liberal Arts, Kagoshima University Professor, 教養部, 教授 (50129285)
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| Co-Investigator(Kenkyū-buntansha) |
INOUE Makoto National Astronomical Observatory, Division of Radio Astronomy, Professor, 電波天文学研究系, 教授 (10151622)
KAWANO Noriyuki National Astronomical Observatory, Division of Earth Rotation, Proffesor, 地球回転研究系, 教授 (10186116)
SASAO Tetsuo National Astronomical Observatory, Division of Earth Rotation, Proffesor, 地球回転研究系, 教授 (20000177)
KAWAGUTI Noriyuki National Astronomical Observatory, Division of Radio Astronomy, Associate Profes, 電波天文学研究系, 助教授 (90214618)
MORIMOTO Masaki College of Liberal Arts, Kagoshima University, Professor, 教養部, 教授 (80012805)
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| Project Period (FY) |
1994 – 1996
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| Keywords | VLBI / maser / Interferometer / quaser / galactic nuclei / star formation / late type star |
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| Research Abstract |
We constructed a VLBI network composed of 4 stations spread over the islands of Japan in 1993. The longest baseline of this network is 1305 km long which provides a fringe spacing of 2" and 1" at 22 and 43 GHz, respectively. The primary purpose of this research is to study the superluminal jets in the active galactic nuclei and the great clouds of astronomical maser spots in the star forming region and the circumstellar shells around the late type stars by using this VLBI network. From this, we want to make clear the true nature of the circulation and the evolution of matter in the universe.
A dozen or so observations have been done or are now going on. Some of the data of maser observations were already analyzed by the multiple fringe-rate mapping method to obtain wide-field map of the masing region. Here I will review some very interesting results.
Imai et al. (1997) observed water masers around 21 late type stars using this network and found that the spot size of maser spots is one or
… More
der smaller than that estimated so far. They also detected for the first time systematic shifts of line-of-sight velocities in time by performing VLBI monitoring observations of water masers around a semiregular variable RT Vir.
Omodaka, Motizuki et al. performed VLBI monitoring observations of Orion KL bipolar outflow and discovered for the first time maser spots around the nozzle of outflow, IRc2. Also they found that these spots are accelerated. By continuing this observations we want to put on the truck of these spots and obtain very important informations of velocity field of bipolar outflow.
Furuya et al. made VLBI observations of the maser spots around the low mass star S106FIR,and revealed the velocity structure associated with the proto-stellar accretion disk.
On the other hand, some of the data of continuum sources associated with AGN were also analyzed. Kameno et al. observed relativistic jets associated with 3C380, and detected the proper motion of these jets. Some other very interesting results are obtained, but they are omitted. Less
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