The origin of the X-ray-emitting plasma in the eastern edge of the Cygnus Loop
The origin of the X-ray-emitting plasma in the eastern edge of the Cygnus Loop
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DOI：
10.1111/j.1365-2966.2010.16684.x
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发表时间：
2010-03
影响因子：
4.8
通讯作者：
Xin Zhou;F. Bocchino;M. Miceli;S. Orlando;Yang Chen
中科院分区：
文献类型：
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作者：
Xin Zhou;F. Bocchino;M. Miceli;S. Orlando;Yang Chen
天鹅座环与其东侧（XA区域）的空腔壁突起相互作用，在那里X射线发射非常明亮。由于环境的复杂性和激波-云相互作用的非线性物理过程，使得X射线辐射的起源至今仍不清楚。我们的目的是了解XA区X射线发射的物理起源，特别是热传导在相互作用过程中的作用。我们分析了两个XMM-Newton数据集，进行图像分析和空间分辨光谱分析的一组均匀的区域。我们应用了最近开发的诊断工具，比较光谱分析结果与理论模型的预测，并估计热传导的X射线发射的冲击等离子体的thecurcency。我们发现，非均匀空腔壁中既有大团块（突起），也有密度不同的孤立小团块。一个大的压痕弯曲到southis检测。周围ISM的丰度是太阳值的10.2倍。关键词：ISM：个体：天鹅座圈，G74.0−8.5 - ISM：云- ISM：超新星遗迹-X射线：ISM。
ABSTRACT The Cygnus Loop is interacting with a protrusion of the cavity wall in its easternedge (the XA region), where the X-ray emission is very bright. The complexity of theenvironment and the non-linear physical processes of the shock-cloud interaction makethe origin of the X-ray emission still not well understood. Our purpose is to understandthe physicaloriginofthe X-rayemissionin the XA region,addressing,in particular,therole of thermal conduction in the interaction process. We analyzed two XMM-Newtondata sets, performing image analysis and spatially resolved spectral analysis on a setof homogeneous regions. We applied a recently developed diagnostic tool to comparespectral analysis results with predictions of theoretical models, and to estimate theefficiency of thermal conduction on the X-ray emitting shocked plasma. We found thatthe inhomogeneous cavity wall contains both large clumps (the protrusion) and smallisolated clumps with different densities. A large indentation bent over to the southis detected. The abundance of the surrounding ISM is ∼ 0.2 times solar value. Weconfirmed the important role of thermal conduction in the evolution of X-ray emittingplasma during shock-cloud interaction.Keywords: ISM: individual: Cygnus Loop, G74.0−8.5 – ISM: clouds – ISM: super-nova remnants – X-rays: ISM.