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arXiv 0904.0553astro-ph.COastro-ph.GA
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M31中39个球状星团的光谱能量分布和年龄估计

Spectral Energy Distributions and Age Estimates of 39 Globular Clusters in M31

Jun Ma, Zhou Fan, Richard de Grijs, Zhenyu Wu, Xu Zhou, Jianghua Wu

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Accepted for Publication in AJ, 18 pages, 5 figures, 5 tables
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摘要：

本文补充了Jiang等（2003）在北京-亚利桑那-台湾-康涅狄格（BATC）测光系统综合测光的基础上研究了172个M31球状星团（GC）和Battistini等（1987）的球状星团候选者的工作。在这里，我们提出了剩余的39个M31 GC和候选者的CCD测光数据（在BATC系统中）。此外，通过比较我们的精确测光与更新的理论恒星合成模型，35个GC的年龄受到限制。我们在远紫外和近紫外以及2 MASS红外$JHK_s$数据中使用GALEX的光度测量，并结合光学光度测量。除两个星系团外，其余样品GC的年龄均大于1Gyr。它们的年龄分布表明，大多数样本集群的年龄小于6 Gyr，峰值约为3 Gyr，尽管众所周知的旧GC的“通常”补充（即，与银河系大多数GC年龄相似的GC也存在。

英文摘要：

This paper supplements Jiang et al. (2003), who studied 172 M31 globular clusters (GCs) and globular cluster candidates from Battistini et al. (1987) on the basis of integrated photometric measurements in the Beijing-Arizona-Taiwan-Connecticut (BATC) photometric system. Here, we present multicolor photometric CCD data (in the BATC system) for the remaining 39 M31 GCs and candidates. In addition, the ages of 35 GCs are constrained by comparing our accurate photometry with updated theoretical stellar synthesis models. We use photometric measurements from GALEX in the far- and near-ultraviolet and 2MASS infrared $JHK_s$ data, in combination with optical photometry. Except for two clusters, the ages of the other sample GCs are all older than 1 Gyr. Their age distribution shows that most sample clusters are younger than 6 Gyr, with a peak at ~3 Gyr, although the `usual' complement of well-known old GCs (i.e., GCs of similar age as the majority of the Galactic GCs) is present as well.

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