Simulations of Fractal Star Cluster Formation. I. New Insights for Measuring Mass Segregation of Star Clusters with Substructure

doi:10.3847/1538-4357/aa6ea5

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	Simulations of Fractal Star Cluster Formation. I. New Insights for Measuring Mass Segregation of Star Clusters with Substructure
	Yu,Jincheng 2,3; Puzia,Thomas H.2; Lin,Congping 1,4,5; Zhang,Yiwei 3,4
刊名	The Astrophysical Journal
	2017-05-12
卷号	840 期号:2
关键词	globular clusters: general methods: data analysis methods: numerical
ISSN号	0004-637X
DOI	10.3847/1538-4357/aa6ea5
英文摘要	Abstract We compare the existent methods, including the minimum spanning tree based method and the local stellar density based method, in measuring mass segregation of star clusters. We find that the minimum spanning tree method reflects more the compactness, which represents the global spatial distribution of massive stars, while the local stellar density method reflects more the crowdedness, which provides the local gravitational potential information. It is suggested to measure the local and the global mass segregation simultaneously. We also develop a hybrid method that takes both aspects into account. This hybrid method balances the local and the global mass segregation in the sense that the predominant one is either caused by dynamical evolution or purely accidental, especially when such information is unknown a priori. In addition, we test our prescriptions with numerical models and show the impact of binaries in estimating the mass segregation value. As an application, we use these methods on the Orion Nebula Cluster (ONC) observations and the Taurus cluster. We find that the ONC is significantly mass segregated down to the 20th most massive stars. In contrast, the massive stars of the Taurus cluster are sparsely distributed in many different subclusters, showing a low degree of compactness. The massive stars of Taurus are also found to be distributed in the high-density region of the subclusters, showing significant mass segregation at subcluster scales. Meanwhile, we also apply these methods to discuss the possible mechanisms of the dynamical evolution of the simulated substructured star clusters.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-840-2-AA6EA5
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/36006]
专题	中国科学院国家天文台
作者单位	1.Hubei Key Laboratory of Engineering Modeling and Scientific Computing, Huazhong University of Science and Technology, 1037 Luoyu road,Wuhan 430074, China 2.Institute of Astrophysics, Pontificia Universidad Católica, Av.?Vicu?a Mackenna 4860, Casilla 306, Santiago 22, Chile; yujc.astro@gmail.com, tpuzia@gmail.com 3.National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, China 4.Center for Mathematical Science, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 4370074, China; congpinglin@gmail.com, yiweizhang831129@gmail.com 5.School of Mathematics and Statistics, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 4370074, China
推荐引用方式 GB/T 7714	Yu,Jincheng,Puzia,Thomas H.,Lin,Congping,et al. Simulations of Fractal Star Cluster Formation. I. New Insights for Measuring Mass Segregation of Star Clusters with Substructure[J]. The Astrophysical Journal,2017,840(2).
APA	Yu,Jincheng,Puzia,Thomas H.,Lin,Congping,&Zhang,Yiwei.(2017).Simulations of Fractal Star Cluster Formation. I. New Insights for Measuring Mass Segregation of Star Clusters with Substructure.The Astrophysical Journal,840(2).
MLA	Yu,Jincheng,et al."Simulations of Fractal Star Cluster Formation. I. New Insights for Measuring Mass Segregation of Star Clusters with Substructure".The Astrophysical Journal 840.2(2017).