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SPECTRAL ENERGY DISTRIBUTIONS AND AGE ESTIMATES OF 104 M31 GLOBULAR CLUSTERS

机译:104个M31球状团簇的光谱能量分布和年龄估计

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We present photometry of 104 M31 globular clusters (GCs) and GC candidates in 15 intermediate-band filters of the Beijing-Arizona-Taiwan-Connecticut photometric system. The GCs and GC candidates were selected from the Revised Bologna Catalog (v.3.5). We obtain the cluster ages by comparing the photometric data with up-to-date theoretical synthesis models. The photometric data used are Galaxy Evolution Explorer far- and near-ultraviolet and Two Micron All Sky Survey near-infrared JHK s magnitudes, combined with optical photometry. The ages of our sample clusters cover a large range, although most clusters are younger than 10?Gyr. Combined with the ages obtained in our series of previous papers focusing on the M31 GC system, we present the full M31 GC age distribution. The M31 GC system contains populations of young and intermediate-age GCs, as well as the "usual" complement of well-known old GCs, i.e., GCs of similar age as the majority of the Galactic GCs. In addition, young GCs (and GC candidates) are distributed nearly uniformly in radial distance from the center of M31, while most old GCs (and GC candidates) are more strongly concentrated.
机译:我们介绍了北京-亚利桑那州-台湾-康涅狄格州光度学系统的15个中频带滤光片中104个M31球状星团(GC)和候选GC的光度法。 GC和GC候选对象选自修订的Bologna目录(v.3.5)。我们通过将光度数据与最新的理论合成模型进行比较来获得聚类年龄。所使用的光度数据为Galaxy Evolution Explorer的近紫外和近紫外光以及“两微米全天候测量”近红外JHK量级,结合了光学光度法。尽管大多数星团的年龄都小于10?Gyr,但我们的星团的年龄覆盖范围很广。结合我们在先前针对M31 GC系统的系列文章中获得的年龄,我们提供了完整的M31 GC年龄分布。 M31 GC系统包含年轻和中年GC的群体,以及众所周知的旧GC的“通常”补充,即年龄与大多数Galactic GC相似的GC。此外,年轻的GC(和GC候选)在距M31中心的径向距离上几乎均匀分布,而大多数旧的GC(和GC候选)则更集中。

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