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arXiv 2003.13836astro-ph.GA
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根据宿主星系团的动力学状态和星系亮度对星系进行分类和演化

Classification and Evolution of Galaxies According to the Dynamical State of Host Clusters and Galaxy Luminosities

D. F. Morell, A. L. B. Ribeiro, R. R. de Carvalho, S. B. Rembold, P. A. A. Lopes, A. P. Costa

摘要:

以Yang SDSS星表中的146个星系团为样本,分析了星系演化与星系团动力学状态和星系光度的关系。根据星系团的速度分布分为高斯型(G)和非高斯型(NG),并进一步根据光度区进行划分。我们进行了一个分类,在EST-SSFR平面提供三个类别:恒星形成(SF),被动(PAS),和中间(GV -绿谷)。我们表明,星系在G和NG系统中以相同的方式演化,但也表明,它们的形成历史导致不同的混合星系类型和下落模式。将GV分为恒星形成和被动组件,我们发现更多的明亮星系的被动模式的NG比G系统。我们还发现更多的中间暗弱星系的恒星形成的组成部分的NG比G系统。我们的研究结果表明,GV的阶段,从类型Sab和Scd到S 0的过渡必须发生,但形态类型之间的转换是独立的集群的动力学阶段。通过对速度频散剖面的分析,我们发现最近落入星系团的天体在G和NG系统中具有不同的组成。虽然所有类型的星系都落入G系统,但Sab和Scd主导了NG系统的落入。最后,我们发现,在NG系统的外围微弱的Scd呈现出较高的不对称性相对于场星系的平均不对称性,这表明环境的影响,这些对象上。

英文摘要:

We analyze the dependence of galaxy evolution on cluster dynamical state and galaxy luminosities for a sample of 146 galaxy clusters from the Yang SDSS catalog. Clusters were split according to their velocity distribution in Gaussians (G) and Non-Gaussians (NG), and further divided by luminosity regime. We performed a classification in the Age-SSFR plane providing three classes: star-forming (SF), passive (PAS), and intermediate (GV -- green valley). We show that galaxies evolve in the same way in G and NG systems, but also suggest that their formation histories leads to different mixtures of galactic types and infall patterns. Separating the GV into star-forming and passive components, we find more bright galaxies in the passive mode of NG than in G systems. We also find more intermediate faint galaxies in the star-forming component of NG than in G systems. Our results suggest the GV as the stage where the transition from types Sab and Scd to S0 must be taking place, but the conversion between morphological types is independent of the dynamical stage of the clusters. Analyzing the velocity dispersion profiles, we find that objects recently infalling in clusters have a different composition between G and NG systems. While all galaxy types infall onto G systems, Sab and Scd dominate the infall onto NG systems. Finally, we find that faint Scd in the outskirts of NG systems present higher asymmetries relative to the mean asymmetry of field galaxies, suggesting environmental effects acting on these objects.

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