Systematic differences in simple stellar population model results: application to the M31 globular-like cluster system

	Systematic differences in simple stellar population model results: application to the M31 globular-like cluster system
	Fan, Z.1 ; de Grijs, R.2,3
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2012-08-01
卷号	424 期号:3 页码:2009-2022
关键词	methods: data analysis globular clusters: general galaxies: individual: M31
英文摘要	Simple stellar population (SSP) synthesis models are useful tools for studying the nature of unresolved star clusters in external galaxies. However, the plethora of currently available SSP models gives rise to significant and poorly documented systematic differences. Here we consider the outputs of the commonly used Bruzual & Charlot and GALaxy EVolution (GALEV) models, as well as a recently updated SSP model suite which attempts to include the contributions of binary merger products in the form of blue straggler stars (BS-SSP). We rederive the ages, metallicities, extinction values and masses of 445 previously observed globular-like clusters in M31 based on ?2 minimization of their spectral energy distributions with respect to these three different SSP models by adopting a Chabrier-like stellar initial mass function. A comparison between our new results and previous estimates of the same parameters shows that the Bruzual & Charlot models yield the youngest ages and lowest masses, while adoption of the BS-SSP models results in the oldest ages and highest mass estimates. Similarly, the GALEV SSP models produce the lowest metallicities, with the highest values resulting from the BS-SSP model suite. These trends are caused by intrinsic differences associated with the models and are not significantly affected by the well-known agemetallicity degeneracy. Finally, we note that the mass function of the massive M31 star clusters is similar to that of the Milky Way's globular clusters, which implies that the two star cluster systems likely formed under similar environmental conditions.
收录类别	SCI
语种	英语
WOS记录号	WOS:000307018300033
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/6192]
专题	国家天文台_光学天文研究部
作者单位	1.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100012, Peoples R China 2.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China 3.Kyung Hee Univ, Dept Astron & Space Sci, Yongin 449701, Kyungki Do, South Korea
推荐引用方式 GB/T 7714	Fan, Z.,de Grijs, R.. Systematic differences in simple stellar population model results: application to the M31 globular-like cluster system[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2012,424(3):2009-2022.
APA	Fan, Z.,&de Grijs, R..(2012).Systematic differences in simple stellar population model results: application to the M31 globular-like cluster system.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,424(3),2009-2022.
MLA	Fan, Z.,et al."Systematic differences in simple stellar population model results: application to the M31 globular-like cluster system".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 424.3(2012):2009-2022.