Resolution of structure and formation of galaxies by using highly precise astrometric observations

我们研究了以下与银河系动力结构有关的理论分析，并密切关注未来将出现的高精度天体测量观测。此外，还执行了红外天体测量卫星计划本身。螺旋臂的起源：虽然密度波理论是解释螺旋臂起源的一个很好的候选者，但它的真实性还不确定。我们发展了一种方法，可以利用高精度天体测量所获得的恒星运动学信息来确定密度波是否是起源。此外，我们还发现，俯仰角可能由杆势和螺旋臂的图案的影响的平衡所决定。在将视差转换为距离时，视差误差较大时会产生一些偏差，因此需要注意。然后，我们开发了一种不会产生偏差的新方法。动力学结构模型的建立：研究了银河系动力学结构理论模型的建立方法。用半解析的方法分析了宇宙早期星系的形成和演化，以及可能与星系演化密切相关的类星体。对红外天体测量卫星计划进行了审查。对原始规范进行了总结。

We examined the following theoretical analyses in connection with the dynamical structure of the Galaxy, keeping an eye on the highly precise astrometric observations coming out in the future. Furthermore the infrared astrometry satellite plan itself was performed.1. The origin of the Spiral arms : although the density wave theory is a good candidate which can explain the origin of spiral arms , it is not sure whether it is true or not. We developed a method which can determine whether the density wave is the origin or not by using the information on kinematics of stars which will be taken by high precise astrometric observations. Furthermore we found that a pitch angle might be decided by balance of the influence by bar potential, and pattern of a spiral arm.2. Since some biases arise when the error of a parallax is large in changing a parallax to a distance, cautions are required. Then we developed a new method which cannot produce biases.3. Construction of the model of dynamical structure : the method to construct theoretical models of the dynamical structure of the Galaxy was investigated.4. We analyzed formation and evolution of galaxies in the early stages of the universe, and moreover QSO which might be closely connected with evolutions of galaxies using the semi- analytical method.5. The infrared astrometry satellite plan was examined. The primitive specification was summarized.