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arXiv 1409.4765astro-ph.GA
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亚位力初始条件和R136的诞生温度的影响

On the Effects of Subvirial Initial Conditions and the Birth Temperature of R136

Daniel Caputo, Nathan de Vries, Simon Portegies Zwart

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Accepted for publication in MNRAS
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摘要：

我们研究了不同初始维里温度Q对星团动力学的影响。我们发现，维里温度有很强的影响所产生的系统的许多方面，其中包括：从系统中逃逸的机构的分数，系统的崩溃的深度，和质量分离的强度。这些差异表明使用“冷”初始条件的做法不再是一种简单的方便选择。初始维里温度的选择必须仔细考虑，因为它对模拟的其余部分的影响可能是深远的。我们讨论的陷阱，并旨在描述的一般行为的崩溃和由此产生的系统作为维里温度的函数，使一个合理的选择初始维里温度可以。我们做了一个修正，以包括Q的依赖性，$R_{min}\approx Q + N^{(-1/3)}$，其中$N$是粒子的数量的最小半径，$R_{min}$，在最深的时刻崩溃的集群的先前的理论估计。我们使用我们的数值结果来推断更多关于年轻星系团R136的初始条件。基于我们的分析，我们发现R136可能是在一个相当冷的，但不是很冷的初始维里温度（$Q\approx 0.13$）下形成的。使用相同的分析方法，我们研究了其他15个年轻的星系团，发现最常见的初始维里温度在0.18和0.25之间。

英文摘要：

We investigate the effect of different initial virial temperatures, Q, on the dynamics of star clusters. We find that the virial temperature has a strong effect on many aspects of the resulting system, including among others: the fraction of bodies escaping from the system, the depth of the collapse of the system, and the strength of the mass segregation. These differences deem the practice of using "cold" initial conditions no longer a simple choice of convenience. The choice of initial virial temperature must be carefully considered as its impact on the remainder of the simulation can be profound. We discuss the pitfalls and aim to describe the general behavior of the collapse and the resultant system as a function of the virial temperature so that a well reasoned choice of initial virial temperature can be made. We make a correction to the previous theoretical estimate for the minimum radius, $R_{min}$, of the cluster at the deepest moment of collapse to include a Q dependency, $R_{min}\approx Q + N^{(-1/3)}$, where $N$ is the number of particles. We use our numerical results to infer more about the initial conditions of the young cluster R136. Based on our analysis, we find that R136 was likely formed with a rather cool, but not cold, initial virial temperature ($Q\approx 0.13$). Using the same analysis method, we examined 15 other young clusters and found the most common initial virial temperature to be between 0.18 and 0.25.

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