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首页> 外文期刊>New astronomy >Diffuse thermal X-ray emission in the core of the young massive cluster Westerlund 1
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Diffuse thermal X-ray emission in the core of the young massive cluster Westerlund 1

机译：X射线在年轻大规模星团Westerlund 1核心的扩散热辐射

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摘要

We present an analysis of the diffuse hard X-ray emission in the core of the young massive Galactic cluster Westerlund 1 based on a 48 ks XMM-Newton observation. Chandra results for the diffuse X-ray emission have indicated a soft thermal component together with a hard component that could be either thermal or non-thermal. We seek to resolve this ambiguity regarding the hard component exploiting the higher sensitivity of XMM-Newton to diffuse emission. Our new X-ray spectra from the central (2′ radius) diffuse emission are found to exhibit He-like Fe 6.7 keV line emission, demonstrating that the hard emission in the cluster core is predominantly thermal in origin. Potential sources of this hard component are reviewed, namely an unresolved Pre-Main Sequence population, a thermalized cluster wind and Supernova Remnants interacting with stellar winds. We find that the thermalized cluster wind likely contributes the majority of the hard emission with some contribution from the Pre-Main Sequence population. It is unlikely that Supernova Remnants are contributing significantly to the Westerlund 1 diffuse emission at the current epoch.
机译：我们基于48 ks XMM-Newton观测结果，对年轻的大型星系团Westerlund 1的核心中的弥漫性硬X射线发射进行了分析。 Chandra的漫射X射线发射结果表明，软的热成分与硬的成分可能是热的也可能是非热的。我们力图解决这种关于硬部件的歧义，即利用XMM-Newton对扩散发射的更高灵敏度。我们从中心（2'半径）扩散发射获得的新X射线光谱显示出He状Fe 6.7 keV线发射，表明簇状核中的硬发射主要来自热源。对该硬组分的潜在来源进行了综述，即未解析的主前序列种群，热星团风和与恒星风相互作用的超新星残余。我们发现，热化团簇风可能贡献了大部分的硬排放，而主前序列群则贡献了一些贡献。在当前时期，超新星遗迹不太可能对Westerlund 1扩散发射做出重大贡献。

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