大质量星系团Westerlund 1和NGC 3603 YC的瞬时星暴
Instantaneous starburst of the massive clusters Westerlund 1 and NGC 3603 YC
摘要：
提出了一种新的方法来确定星爆星团中已分辨的恒星星族的年龄分布。该方法依赖于两步过程。在第一步中，根据多历元天体测量监测确定星团的运动学成员。在第二步中，进行贝叶斯分析，比较观察到的光度序列的集群成员与理论等时线。当应用这种方法的光学和近红外高角分辨率哈勃太空望远镜（HST）和自适应光学观测的500万年前的星暴集群Westerlund 1和200万年前的星暴集群NGC 3603 YC，我们得到的年龄跨度的上限分别为0.4和0.1百万年。结果强烈表明，这些星爆星团中的恒星形成几乎是瞬间发生的。
英文摘要：
We present a new method to determine the age spread of resolved stellar populations in a starburst cluster. The method relies on a two-step process. In the first step, kinematic members of the cluster are identified based on multi-epoch astrometric monitoring. In the second step, a Bayesian analysis is carried out, comparing the observed photometric sequence of cluster members with sets of theoretical isochrones. When applying this methodology to optical and near-infrared high angular resolution Hubble Space Telescope (HST) and adaptive optics observations of the ~5 Myr old starburst cluster Westerlund 1 and ~2 Myr old starburst cluster NGC 3603 YC, we derive upper limits for the age spreads of 0.4 and 0.1 Myr, respectively. The results strongly suggest that star formation in these starburst clusters happened almost instantaneously.
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