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arXiv 1610.02437astro-ph.GA
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银河系中心晚型恒星密度分布的统计方法

The late-type stellar density profile in the Galactic Center: A statistical approach

Samantha N. Chappell, Andrea M. Ghez, Tuan Do, Gregory D. Martinez, Sylvana Yelda, Breann N. Sitarski, Jessica R. Lu, Mark R. Morris

摘要:

银河系中心的晚型恒星星族最初被预测为处于动态松弛的尖点(幂律斜率从3/2到7/4)。然而,依赖模型来校正投影效应的观测结果却表明,分布是平坦的。需要进行这种校正是由于缺乏有关视线距离的信息。有了20年的天体测量基线,我们现在能够测量显着的投影径向加速度,其中六个是新报告的,直接限制视线距离。在这里,我们提出了一个统计方法,利用这些信息,更准确地约束在银河系中心的晚型恒星星族的径向密度分布的形状。

英文摘要:

The late-type stellar population in the Galactic Center was first predicted to reside in a dynamically relaxed cusp (power law slope ranging from 3/2 to 7/4). However, observations - which rely on models to correct for projection effects - have suggested a flat distribution instead. The need for this correction is due to the lack of information regarding the line-of-sight distances. With a two decade long baseline in astrometric measurements, we are now able to measure significant projected radial accelerations, six of which are newly reported here, that directly constrain line-of-sight distances. Here we present a statistical approach to take advantage of this information and more accurately constrain the shape of the radial density profile of the late-type stellar population in the Galactic Center.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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