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arXiv 1003.3424astro-ph.HE
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天鹅座环东缘X射线发射等离子体的起源

The origin of the X-ray emitting plasma in the eastern edge of the Cygnus Loop

Xin. Zhou, Fabrizio. Bocchino, Marco. Miceli, Salvatore. Orlando, Yang. Chen

摘要:

天鹅座圈与其东部边缘(XA区域)的空腔壁的突起相互作用,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,使得对X射线辐射的起源至今仍没有很好的认识。我们的目的是了解的物理起源的X射线发射在XA区域,特别是解决,在相互作用过程中的热传导的作用。我们分析了两个XMM-牛顿数据集,进行图像分析和空间分辨光谱分析一组均匀的区域。我们应用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,并估计热传导的效率上的X射线发射冲击等离子体。我们发现,非均匀空腔壁包含大团块(突起)和不同密度的小孤立团块。检测到向南弯曲的大压痕。周围ISM的丰度约为太阳值的0.2倍。我们证实了热传导在激波-云团相互作用过程中X射线发射等离子体演化中的重要作用。

英文摘要:

The Cygnus Loop is interacting with a protrusion of the cavity wall in its eastern edge (the XA region), where the X-ray emission is very bright. The complexity of the environment and the non-linear physical processes of the shock-cloud interaction make the origin of the X-ray emission still not well understood. Our purpose is to understand the physical origin of the X-ray emission in the XA region, addressing, in particular, the role of thermal conduction in the interaction process. We analyzed two XMM-Newton data sets, performing image analysis and spatially resolved spectral analysis on a set of homogeneous regions. We applied a recently developed diagnostic tool to compare spectral analysis results with predictions of theoretical models, and to estimate the efficiency of thermal conduction on the X-ray emitting shocked plasma. We found that the inhomogeneous cavity wall contains both large clumps (the protrusion) and small isolated clumps with different densities. A large indentation bent over to the south is detected. The abundance of the surrounding ISM is ~0.2 times solar value. We confirmed the important role of thermal conduction in the evolution of X-ray emitting plasma during shock-cloud interaction.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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