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Observational Study of the Galactic Nuclear Disk using SiO Masers

使用 SiO 微波激射器对银河核盘进行观测研究

基本信息

批准号：
12640243
负责人：
DEGUCHI Shuji
金额：
$ 2.3万
依托单位：
NATIONAL ASTRONOMICAL OBSERVATORY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12640243/
关键词：
Silicon Monooxide Galaxy Kinematics Galactic Center 一酸化珪素メーザー銀河中心核

项目摘要

In a three-year research during 2001-2003, we performed the following observations. 1. A shallow survey of SiO maser sources in a area of 20 arcminutes toward the galactic center using a multi-beam receiver. 2. A survey of300 Large Amplitude Variables in SiO masers in the Galactic nuclear disk. 3. VLBA observations of Sgr A^* and SiO maser sources around it. S. Deguchi mainly concerned with observations 1 and 2, and associated data reductions, and M. Miyoshi concerned with the observation 3. With observations 1 and 2, we found that there are several stars with very high radial velocities, and that the rotational velocity field consists of two components. With monitoring observations of the Galactic center SiO masers, we found that the masers associated with IRs10 flared again during May - December 2002. Therefore, we made VLBI observations again in 2003 January. The data are now under processing by M. Miyoshi. From the observations made in July 2000, we obtained the proper motion of IRs10 relative to Sgr A^*. In addition, we performed the high resolution imaging of Sgr A^*. According to this analysis, it was tuend out that the intensity and emission distribution of Sgr A^* varies within a few hours. Because this is due to flares of Sgr A^*, we discovered the variation of the Sgr A^* flare first in the world. These new results were presented in the international symposium at Hawaii. We still have several Large Amplitude Variables unobserved and will finish observations this summer.

在2001 - 2003年的三年研究中，我们进行了以下观察。1.用多波束接收机对银河系中心20弧分范围内SiO脉泽源进行了浅区观测。2.银河核盘中300个SiO脉泽大振幅变星的测量3. Sgr A ^* 及其周围SiO脉泽源的VLBA观测。Deguchi主要关注观测1和2以及相关的数据缩减，M.三好关注观察3.通过观测1和2，我们发现有几颗恒星具有非常高的径向速度，并且旋转速度场由两个分量组成。通过对银河系中心SiO脉泽的监测观测，发现2002年5 - 12月期间与IR 10有关的脉泽再次爆发。因此，我们在2003年1月再次进行了VLBI观测。数据目前正在由M.三好根据2000年7月的观测，我们得到了IRs 10相对于Sgr A ^* 的自行。此外，我们对Sgr A ^* 进行了高分辨率成像。根据这一分析，我们发现Sgr A ^* 的强度和发射分布在几个小时内发生变化。由于这是由Sgr A ^* 耀斑引起的，我们在世界上首次发现了Sgr A ^* 耀斑的变化。这些新的结果在夏威夷的国际研讨会上发表。我们还有几个大振幅变星没有观测到，并将在今年夏天完成观测。