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Research on Galactic dynamics with maser sources

微波激射源银河系动力学研究

基本信息

批准号：
08640337
负责人：
DEGUCHI Shuji
金额：
$ 1.41万
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：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08640337/
关键词：
maser SiO Galactic bar Galactic rotation Late-type stars 銀河系力学

项目摘要

The purpose of this research was to investigate the rotation curve of the Galaxt by measuring the radial velocities of maser sources with high accuracy that is now available with techniques in radio astronomy. The high sensitivity radio observations extends the method of positional astronomy, which were based on the observations on nearby stars, to all the way in the Galaxy. We have measured radial velocities of SiO and OH/H2O masers ources, obtained the rotation curve of the Galaxy, and clarify the difference of motion between the gas and stars. We also tested a possibility of measuring proper motions of nearby maser sources. we have identified the maser sources with infrared JHK imaging observations : positions of stars were measured in an accuracy of arcsec, and determined the distances from the spectral energy distribution in the near and mid infrared data.With the analyzes of the data obtained by these radio and near-infrared observations, we have obtained the foolowing results ;(1) The radial velocity data of SiO maser sources at the outer Galaxy show that the Galactic rotation curve is slowly decreasing with radius near the solar neibourhood, and the oxygen-and carbon-rich stars have a different characteristic in the near-infrared color index.(2) We founda number of SiO maser sources in the directions of Sgr B molecular cloud and they are identified at the near-infrared imaging as stars. We also found many SiO maser sources within 1 arc minute from the Galactic center.(3) Analyzes the positional and velocity data of water maser spots revealed the presence of accelerating motion of the maser spots.Based on these observations, we have confirmed the possibility of measuring stellar motions in the Galaxy with high accuracy by the method combining the radio and infrared techniques.

这项研究的目的是通过高精度地测量微波激射源的径向速度来研究 Galaxt 的旋转曲线，这种精度现在可以通过射电天文学技术实现。高灵敏度射电观测将基于对邻近恒星观测的位置天文学方法扩展到整个银河系。我们测量了SiO和OH/H2O脉源的径向速度，得到了银河系的自转曲线，阐明了气体与恒星运动的差异。我们还测试了测量附近微波激射源自行的可能性。我们通过红外JHK成像观测识别了脉泽源：以角秒的精度测量了恒星的位置，并根据近红外和中红外数据的光谱能量分布确定了距离。通过对这些射电和近红外观测数据的分析，我们得到了以下结果：（1）银河系外SiO脉泽源的径向速度数据表明：银河系自转曲线在太阳附近随半径缓慢减小，富氧、富碳恒星在近红外颜色指数上有不同的特征。(2)在Sgr B分子云方向发现了多个SiO脉塞源，在近红外成像中将它们识别为恒星。我们还在距离银河系中心1角分的范围内发现了许多SiO脉泽源。(3)分析了水脉泽点的位置和速度数据，揭示了水脉泽点加速运动的存在。基于这些观测，我们证实了利用射电和红外技术相结合的方法高精度测量银河系恒星运动的可能性。