Exploring the origins of the young stars in the central parsec of the Galaxy with stellar dynamics
Exploring the origins of the young stars in the central parsec of the Galaxy with stellar dynamics
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用恒星动力学探索银河系中央差距年轻恒星的起源
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发表时间：
2008
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通讯作者：
Jessica R. Lu
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作者：
Jessica R. Lu
杰西卡·瑞恩·卢 (Jessica Ryan Lu) 加州大学洛杉矶分校天文学哲学博士《用恒星动力学探索银河系中央秒差距中年轻恒星的起源》论文的出处 Andrea M. Ghez 教授，主席 与银河系中心超大质量黑洞相关的最令人困惑的问题之一是其附近年轻恒星的起源。在本论文中，利用 W. M. Keck 望远镜获得的高分辨率红外图像来研究年轻恒星的分布和运动学，从而解决了年轻恒星起源的问题。首先，利用自行测量和基于 W. M. Keck 10 米望远镜 9 年衍射极限 K(2.2 μm) 波段散斑成像的恒星数密度计数，我们识别出了一个新的同动恒星群，我们将其称为 IRS 16SW 同动恒星群，距离中心黑洞 1. 9（投影中为 0.08 pc）。这个共同移动星团的五个成员中的四个已通过光谱鉴定为大质量年轻恒星，特别是 He I 发射线恒星和 OBN 恒星。这是银河系中央秒差距内第二个被识别的年轻同移星团，在投影中距离中央黑洞最近，距离为 2 倍。
of the Dissertation Exploring the Origins of the Young Stars in the Central Parsec of our Galaxy with Stellar Dynamics by Jessica Ryan Lu Doctor of Philosophy in Astronomy University of California, Los Angeles, 2008 Professor Andrea M. Ghez, Chair One of the most perplexing problems associated with the supermassive black hole at the center of our Galaxy is the origin of the young stars in its close vicinity. In this thesis, the question of the young stars’ origins is addressed using highresolution infrared images obtained at the W. M. Keck telescopes to study both the distribution and kinematics of the young stellar population. First, using proper motion measurements and stellar number density counts based on 9 years of diffraction-limited K(2.2 μm)-band speckle imaging at the W. M. Keck 10-meter telescopes, we have identified a new comoving group of stars, which we call the IRS 16SW comoving group, located 1. 9 (0.08 pc, in projection) from the central black hole. Four of the five members of this comoving group have been spectroscopically identified as massive young stars, specifically He I emission-line stars and OBN stars. This is the second young comoving group within the central parsec of the Milky Way to be recognized and is the closest, by a factor of 2, in projection to the central black hole.