Dynamics of Stars and Globular Clusters in M87
Dynamics of Stars and Globular Clusters in M87
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DOI：
10.1086/320947
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发表时间：
2000-08
期刊：
影响因子：
--
通讯作者：
A. Romanowsky;C. Kochanek
中科院分区：
文献类型：
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作者：
A. Romanowsky;C. Kochanek
我们研究了附近巨型椭圆星系M87中恒星和球状星团的动力学，并使用大半径范围内的所有可用数据，包括恒星视线速度分布的高阶矩和200多个球状星团的离散速度，限制了质量分布。我们介绍了一种扩展的球面轨道建模方法，该方法充分利用了数据中的所有信息，并对质量模型提供了非常稳健的约束。我们最终排除了质量光比恒定的模型，并推断星系暗晕的径向密度分布比r-2下降得更慢，这表明室女座星系团的势在r~300‘’~20kpc已经占主导地位。
We examine the dynamics of the stars and globular clusters in the nearby giant elliptical galaxy M87 and constrain the mass distribution, using all the available data over a large range of radii, including higher order moments of the stellar line-of-sight velocity distributions and the discrete velocities of over 200 globular clusters. We introduce an extension of spherical orbit modeling methods that makes full use of all the information in the data and provides very robust constraints on the mass models. We conclusively rule out a constant mass-to-light ratio model and infer that the radial density profile of the galaxy's dark halo falls off more slowly than r-2, suggesting that the potential of the Virgo Cluster is already dominant at r ~ 300′′ ~ 20 kpc.