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arXiv 0705.0748astro-ph
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星团核半径与半质量半径之比：对星团中中等质量黑洞的警示

Ratios of star cluster core and half-mass radii: a cautionary note on intermediate-mass black holes in star clusters

Jarrod R. Hurley

备注：
14 pages, 7 figures, accepted for publication in MNRAS
发表信息：
Mon.Not.Roy.Astron.Soc.379:93-99,2007
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摘要：

目前人们对球状星团核心可能存在中等质量黑洞的兴趣很大。基于理论论证和模拟结果，以前曾有人提出，大的核心半径--或者特别是核心半径与半质量半径的大比值--是在星团中找到这样一个黑洞的一个有希望的指标。在这项研究中，100000颗恒星的N-体模型，没有原始双星被用来研究长期的星团结构演化。重要的是，模拟数据分析使用相同的过程，通过该过程从观测到的星团中提取结构参数。这给出了一个核心半径和半质量（或半光）半径的比值，可以直接与银河系球状星团的样本相比较。其结果是，它表明，该样品的大部分观察到的比率可以解释，而不需要一个中等质量的黑洞。此外，具有大的核心与半光半径比的星系团可能拥有一个黑洞双星（由恒星质量的黑洞组成），而不是一个单一的大质量黑洞。这项工作并不排除至少在某些星团的核心存在中等质量的黑洞。

英文摘要：

There is currently much interest in the possible presence of intermediate-mass black holes in the cores of globular clusters. Based on theoretical arguments and simulation results it has previously been suggested that a large core radius -- or particularly a large ratio of the core radius to half-mass radius -- is a promising indicator for finding such a black hole in a star cluster. In this study N-body models of 100000 stars with and without primordial binaries are used to investigate the long-term structural evolution of star clusters. Importantly, the simulation data is analysed using the same processes by which structural parameters are extracted from observed star clusters. This gives a ratio of the core and half-mass (or half-light) radii that is directly comparable to the Galactic globular cluster sample. As a result, it is shown that the ratios observed for the bulk of this sample can be explained without the need for an intermediate-mass black hole. Furthermore, it is possible that clusters with large core to half-light radius ratios harbour a black-hole binary (comprised of stellar mass black holes) rather than a single massive black hole. This work does not rule out the existence of intermediate-mass black holes in the cores of at least some star clusters.

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