早型伽辽金基面对年龄和内部结构的依赖性
Dependence of the Fundamental Plane of Early-type Galaxies on Age and Internal Structure
摘要：
利用Sloan数字巡天数据中的$16,283$ ETGs和$M_r\le-19.5$、$0.025\le z<0.055$，研究了早型星系（ETGs）在基平面（FP）的散射及其对ETGs年龄和内部结构的依赖性。我们使用ETGs的年龄和光度参数之间的关系，如颜色，绝对星等，和中心速度分散的ETGs和发现，在FP的散射依赖于年龄。老年ETG的FP与年龄$\gtrsim9$ Gyrs的$\sim0.06$ dex（$\sim14\%$）的离散度较小，而年轻ETG的FP与年龄$\lesssim6$ Gyrs的$\sim0.075$ dex（$\sim17\%$）的离散度较大。在年轻ETG的情况下，不太紧凑的ETG在FP中的分散度（$\sim0.065$ dex; $\sim15\%$）比更紧凑的ETG（$\sim0.10$ dex; $\sim23\%$）小。另一方面，老ETG的FP中的散射不依赖于星系结构的致密性。因此，在ETG的亚群中，紧凑的年轻ETG在FP中具有最大的分散度。在紧凑的年轻ETG中的这种大的散射是由在中心区域具有低动态质光比（$M_\mathrm{dyn}/L$）和蓝色的ETG引起的。通过与一个简单的模型的星系，经历了一个丰富的气体主要合并，我们发现，最近的丰富的气体主要合并的情况下，可以合理地解释了紧凑的年轻ETG的性质与过量的光对于一个给定的质量（低$M_\mathrm{dyn}/L$）和蓝色的中心颜色。
英文摘要：
We investigate the scatter in the fundamental plane (FP) of early-type galaxies (ETGs) and its dependence on age and internal structure of ETGs, using $16,283$ ETGs with $M_r\le-19.5$ and $0.025\le z<0.055$ in Sloan Digital Sky Survey data. We use the relation between the age of ETGs and photometric parameters such as color, absolute magnitude, and central velocity dispersion of ETGs and find that the scatter in the FP depends on age. The FP of old ETGs with age $\gtrsim9$ Gyrs has a smaller scatter of $\sim0.06$ dex ($\sim14\%$) while that of young ETGs with age $\lesssim6$ Gyrs has a larger scatter of $\sim0.075$ dex ($\sim17\%$). In the case of young ETGs, less compact ETGs have a smaller scatter in the FP ($\sim0.065$ dex; $\sim15\%$) than more compact ones ($\sim0.10$ dex; $\sim23\%$). On the other hand, the scatter in the FP of old ETGs does not depend on the compactness of galaxy structure. Thus, among the subpopulations of ETGs, compact young ETGs have the largest scatter in the FP. This large scatter in compact young ETGs is caused by ETGs that have low dynamical mass-to-light ratio ($M_\mathrm{dyn}/L$) and blue color in the central regions. By comparing with a simple model of the galaxy that has experienced a gas-rich major merger, we find that the scenario of recent gas-rich major merger can reasonably explain the properties of the compact young ETGs with excessive light for a given mass (low $M_\mathrm{dyn}/L$) and blue central color.
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