M31 Globular Clusters in the Hubble Space Telescope Archive. II. Structural Parameters
M31 Globular Clusters in the Hubble Space Telescope Archive. II. Structural Parameters
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DOI：
10.1086/339667
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发表时间：
2002-01
期刊：
影响因子：
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通讯作者：
P. Barmby;Stephen Holland;J. Huchra
中科院分区：
文献类型：
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作者：
P. Barmby;Stephen Holland;J. Huchra
我们分析了空间分辨的河外球状星团的最大可用样本的结构参数。 M31 GC 的图像是在搜索哈勃太空望远镜 (HST) 档案数据时发现的，相关论文对此进行了描述。我们测量了簇的椭圆率和位置角，并得出结论，椭圆率与旋转引起的一致。我们发现大多数星团的表面亮度分布都可以很好地拟合二维单质量 Michie-King 模型。一些星团显示出核心塌陷可能的幂律分布特征，但空间分辨率不够高，无法做出明确的结论。正如在其他星系中发现的那样，富含金属的星团比贫金属的星团稍小。与银河系星团一样，M31 GC 的结构特性之间存在很强的相关性，并且两个族群在参数空间中位于同一“基本平面”附近。
We analyze the structural parameters of the largest available sample of spatially resolved extragalactic globular clusters. The images of M31 GCs were found in a search of Hubble Space Telescope (HST) archival data, described in a companion paper. We measure the ellipticities and position angles of the clusters and conclude that the ellipticities are consistent with being caused by rotation. We find that most clusters' surface brightness distributions are well fitted by two-dimensional single-mass Michie-King models. A few clusters show possible power-law distributions characteristic of core collapse, but the spatial resolution is not high enough to make definitive claims. As has been found for other galaxies, the metal-rich clusters are slightly smaller than the metal-poor clusters. There are strong correlations between structural properties of M31 GCs, as for Milky Way clusters, and the two populations are located close to the same "fundamental plane" in parameter space.