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Indirectly Measuring Stellar Velocity Dispersions in High-redshift Disk Galaxies
Research Notes of the AAS Pub Date : 2020-11-18 , DOI: 10.3847/2515-5172/abca48
Kathleen A. Hamilton-Campos 1, 2 , Raymond C. Simons 1 , Gregory F. Snyder 1 , Daniel Ceverino 3 , Avishai Dekel 4 , Joel R. Primack 5
Affiliation  

In the Milky Way, older stars tend to have higher vertical velocity dispersions and comprise a thicker component of the stellar disk. Historically, this has been attributed to the gradual vertical heating of stellar orbits. A competing explanation suggests that stars may have formed in thicker disks at earlier times, inheriting the turbulent velocities of the gas in which they formed. As the gas velocity dispersion in disks declines with time, stars should form in thinner disks. Both explanations are consistent with today’s Milky Way. We present a novel technique to break this degeneracy by indirectly measuring the vertical stellar velocity dispersion of high redshift galaxies using Hubble Space Telescope imaging. We assess this method using a high-resolution hydrodynamic galaxy formation simulation. By comparing the true vertical velocity dispersion of the simulated disk against what is inferred through its synthetic images, we demonstrate the potential of this approach.



中文翻译:

间接测量高红移盘星系中的恒星速度色散

在银河系中,年龄较大的恒星倾向于具有较高的垂直速度色散,并且包含恒星盘的较厚成分。从历史上看,这归因于恒星轨道的逐渐垂直加热。一种相互竞争的解释表明,恒星可能是在较早的时候在较厚的圆盘中形成的,继承了形成恒星的气体的湍流速度。随着圆盘中气体速度散度随时间下降,较薄的圆盘中应形成恒星。两种解释都符合当今的银河系。我们提出了一种新技术,可以通过使用哈勃太空望远镜成像间接测量高红移星系的垂直星速扩散来打破这种简并性。我们使用高分辨率水动力星系形成模拟评估该方法。

更新日期:2020-11-18
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