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首页> 外文期刊>The Astrophysical journal >MONTE CARLO SIMULATIONS OF GLOBULAR CLUSTER EVOLUTION. VI. THE INFLUENCE OF AN INTERMEDIATE-MASS BLACK HOLE
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MONTE CARLO SIMULATIONS OF GLOBULAR CLUSTER EVOLUTION. VI. THE INFLUENCE OF AN INTERMEDIATE-MASS BLACK HOLE

机译:球团演化的蒙特卡罗模拟。 VI。中间质量黑洞的影响

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We present results from a series of Monte Carlo (MC) simulations investigating the imprint of a central intermediate-mass black hole (IMBH) on the structure of a globular cluster. We investigate the three-dimensional and projected density profiles, and stellar disruption rates for idealized as well as realistic cluster models, taking into account a stellar mass spectrum and stellar evolution, and allowing for a larger, more realistic number of stars than was previously possible with direct N-body methods. We compare our results to other N-body and Fokker-Planck simulations published previously. We find, in general, very good agreement for the overall cluster structure and dynamical evolution between direct N-body simulations and our MC simulations. Significant differences exist in the number of stars that are tidally disrupted by the IMBH, and this is most likely caused by the wandering motion of the IMBH, not included in the MC scheme. These differences, however, are negligible for the final IMBH masses in realistic cluster models, as the disruption rates are generally much lower than for single-mass clusters. As a direct comparison to observations we construct a detailed model for the cluster NGC?5694, which is known to possess a central surface brightness cusp consistent with the presence of an IMBH. We find that not only the inner slope but also the outer part of the surface brightness profile agree well with observations. However, there is only a slight preference for models harboring an IMBH compared to models without.
机译:我们提供了一系列蒙特卡洛(MC)模拟的结果,这些结果调查了球状星团结构上的中央中间质量黑洞(IMBH)的印记。我们研究了三维和投影密度分布图,以及理想星团模型和现实星团模型的恒星破坏率,同时考虑了恒星质谱和恒星演化,并允许比以前更大,更实际的恒星数量直接使用N体方法。我们将我们的结果与之前发布的其他N体和Fokker-Planck模拟进行了比较。总的来说,我们发现直接N体模拟和MC模拟之间的整体簇结构和动力学演化非常吻合。被IMBH潮汐扰动的恒星数量存在显着差异,这很可能是由于IMBH的漂移运动引起的,MC模式未包括在内。但是,在实际的群集模型中,这些差异对于最终的IMBH质量而言可以忽略不计,因为其破坏率通常比单质量群集低得多。作为与观察结果的直接比较,我们为星团NGC?5694构建了一个详细模型,已知该星团具有与IMBH一致的中心表面亮度尖端。我们发现,不仅表面亮度分布的内部斜率而且外部的斜率都与观察结果非常吻合。但是,与没有IMBH的模型相比,带有IMBH的模型只有一点偏爱。

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