The early expansion of cluster cores

The early expansion of cluster cores
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集群核心的早期扩展

DOI:
10.1111/j.1365-2966.2008.13547.x
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发表时间:
2008
影响因子:
4.8
通讯作者:
Bastian N
Bastian N
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Bastian N

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观测到的年轻星星团的性质,如核心半径和光度分布,在早期的演化过程中迅速变化。在这里,我们提出了六个年轻的星系团在M51的观测,我们得出他们的大小usingHubble太空望远镜(HST)成像和年龄使用深双子座北光谱。我们发现的证据表明,在第一个20万年的演化集群核心的快速扩张。我们证实了这一趋势,包括银河系和河外嵌入和年轻的集群的文献中的数据,和可能的机制(快速气体去除,恒星演化质量损失和内部动力学加热)进行了讨论。我们探讨了这一结果的影响,集中在一个事实,即集群更集中在过去,这意味着他们的恒星密度要高得多,弛豫时间(trelax)相应地较短。因此,当估计一个特定的星系团是否是动态弛豫的(即当确定一个星系团的质量分离是由于原始过程还是动力学过程)时,当前的弛豫时间只是一个上限,而弛豫时间在过去可能明显更短。
The observed properties of young star clusters, such as the core radius and luminosity profile, change rapidly during the early evolution of the clusters. Here we present observations of six young clusters in M51 where we derive their sizes usingHubble Space Telescope(HST) imaging and ages using deep Gemini-North spectroscopy. We find evidence for a rapid expansion of the cluster cores during the first 20 Myr of their evolution. We confirm this trend by including data from the literature of both Galactic and extragalactic embedded and young clusters, and possible mechanisms (rapid gas removal, stellar evolutionary mass loss and internal dynamical heating) are discussed. We explore the implications of this result, focussing on the fact that clusters were more concentrated in the past, implying that their stellar densities were much higher and relaxation times (trelax) correspondingly shorter. Thus, when estimating if a particular cluster is dynamically relaxed (i.e. when determining if a cluster's mass segregation is due to primordial or dynamical processes), the current relaxation time is only an upper limit, withtrelaxlikely being significantly shorter in the past.
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