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The VLBI Observations of Astronomical Sources by using The Japanese VLBI network.

使用日本 VLBI 网络对天文源进行 VLBI 观测。

基本信息

批准号：
06302017
负责人：
OMODAKA Toshihiro
金额：
$ 10.18万
依托单位：
Kagoshima University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06302017/
关键词：
VLBI maser Interferometer quaser galactic nuclei star formation late type star maser interfarometer quaser interferometer interferd meter galactic nuclei sta formation

项目摘要

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

我们于1993年在日本岛屿上建立了一个由4个台站组成的VLBI网。该网络的最长基线为1305公里，在22和43 GHz处的边缘间距分别为2”和1”。本研究的主要目的是利用VLBI网络研究活动星系核中的超光速喷流、星星形成区的天文脉泽斑大云团以及晚型恒星周围的星周壳层。我们希望借此弄清宇宙中物质循环和演化的真实性质。已经进行或正在进行的十多次脉泽观测中，部分脉泽观测数据已经用多重条纹率成图方法进行了分析，得到了脉泽区的宽场图。Imai等人（1997）利用这个网络观测了21颗晚型星周围的水脉泽，发现脉泽斑的大小为1或 ...更多信息比目前估计的要小。他们还通过对半规则变星RT Vir周围的水脉泽进行VLBI监测观测，首次发现了视线速度在时间上的系统性变化。Omodaka，Motizuki等人对Orion KL双极外流进行了VLBI监测观测，并首次发现了外流喷嘴IRc 2周围的脉泽斑点。他们还发现这些斑点被加速了。Furuya等人对低质量星星S106 FIR周围的脉泽斑进行了VLBI观测，揭示了与原恒星吸积盘有关的速度结构，同时也分析了与活动星系核有关的连续源的一些数据。卡梅诺等人观测到与3C380有关的相对论喷流，并探测到这些喷流的自行。还得到了其他一些非常有趣的结果，但它们被省略了。少