大麦哲伦云超泡30 Dor C西半部的热X射线辐射
Thermal X-ray Emission in the Western Half of the LMC Superbubble 30 Dor C
AI总结：
本研究利用XMM-Newton和Chandra观测发现大麦哲伦云超泡30 Dor C西半部存在热X射线发射等离子体，温度约0.4 keV，元素过丰暗示近期超新星爆炸，后主序星主导超泡演化。
摘要：
虽然30 Dor C是大麦哲伦云中一个独特的超泡，以其明亮的非热X射线辐射而著称，但其发出的热X射线辐射尚未得到深入研究和严格约束。基于分别约1 Ms的深XMM-Newton和Chandra观测，我们报告了在30 Dor C西半部某些区域发现的热发射等离子体。该热辐射可由碰撞电离平衡等离子体模型重现，平均电子温度约为0.4 keV。我们发现氧、氖、镁和硅等中等质量元素存在显著过丰，这可能表明30 Dor C中近期发生过超新星爆炸。动力学性质结合OB星协LH 90的信息表明，内部的后主序星主导了超泡的功率，并在过去约1 Myr内将其吹散。
英文摘要：
While 30 Dor C is a unique superbubble in the Large Magellanic Cloud for its luminous non-thermal X-ray emission, the thermal X-ray emission it emanates has not yet been thoroughly investigated and well constrained. Based on the separate ~1 Ms deep XMM-Newton and Chandra observations, we report the discovery of the thermally-emitting plasma in some portions of the western half of 30 Dor C. The thermal emission can be reproduced by a collisional-ionization-equilibrium plasma model with an average electron temperature of ~0.4 keV. We find a significant overabundance of the intermediate-mass elements such as O, Ne, Mg, and Si, which may be indicative of a recent supernova explosion in 30 Dor C. Dynamical properties in combination with the information of the OB association LH 90 suggest that the internal post-main-sequence stars dominate the power of the superbubble and blow it out in the past ~1 Myr.
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