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arXiv 2005.09096astro-ph.GA
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与超新星遗迹IC 443相互作用的中击星际气体中的物理条件

Physical Conditions in Shocked Interstellar Gas Interacting with the Supernova Remnant IC 443

Adam M. Ritchey, Edward B. Jenkins, Steven R. Federman, Johnathan S. Rice, Damiano Caprioli, George Wallerstein

AI总结:

本文利用哈勃空间望远镜远紫外光谱研究超新星遗迹IC 443与星际气体的相互作用,揭示了激波后冷却气体、压力不均匀性及前景遗迹物质等物理条件特征。

摘要:

我们展示了对与超新星遗迹IC 443相互作用的星际物质物理条件进行详细研究的结果。我们的分析基于对哈勃空间望远镜上空间望远镜成像光谱仪获得的两颗位于IC 443后方恒星的高分辨率远紫外光谱的全面检验。我们的一个目标(HD 43582)探测沿穿过超新星遗迹的整个视线的气体,而另一个目标(HD 254755)采样位于主超新星激波波前前方的物质。我们在两个方向上识别出低速宁静气体,并发现这些成分中的密度和温度是弥散原子云和分子云的典型值。在朝向HD 43582的中性原子和单电离原子种类的吸收谱线中观测到大量高速成分。这些成分表现出大幅增强的热压和显著降低的尘埃颗粒耗减的组合特征。我们将这些物质解释为远离由激波驱动进入中性气体团块的下游复合区中的冷却气体。对朝向HD 43582的一组高正速度电离气体成分推导出的压力低于其他激波成分的压力,表明整个遗迹中存在压力不均匀性。在朝向HD 43582的高度电离种类的吸收谱线中观测到一个位于约-620 km/s的强甚高速成分。该物质的速度与IC 443软热X射线辐射观测所暗示的激波速度范围一致。朝向HD 254755的中等高速气体可能代表来自一个独立前景超新星遗迹的激波物质。

英文摘要:

We present the results of a detailed investigation into the physical conditions in interstellar material interacting with the supernova remnant IC 443. Our analysis is based on a comprehensive examination of high-resolution far-ultraviolet spectra obtained with the Space Telescope Imaging Spectrograph onboard the Hubble Space Telescope of two stars behind IC 443. One of our targets (HD 43582) probes gas along the entire line of sight through the supernova remnant, while the other (HD 254755) samples material located ahead of the primary supernova shock front. We identify low velocity quiescent gas in both directions and find that the densities and temperatures in these components are typical of diffuse atomic and molecular clouds. Numerous high velocity components are observed in the absorption profiles of neutral and singly-ionized atomic species toward HD 43582. These components exhibit a combination of greatly enhanced thermal pressures and significantly reduced dust-grain depletions. We interpret this material as cooling gas in a recombination zone far downstream from shocks driven into neutral gas clumps. The pressures derived for a group of ionized gas components at high positive velocity toward HD 43582 are lower than those of the other shocked components, pointing to pressure inhomogeneities across the remnant. A strong very high velocity component near -620 km/s is seen in the absorption profiles of highly-ionized species toward HD 43582. The velocity of this material is consistent with the range of shock velocities implied by observations of soft thermal X-ray emission from IC 443. Moderately high-velocity gas toward HD 254755 may represent shocked material from a separate foreground supernova remnant.

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