论文标题
使用XMM-Newton在W49B中重新组合血浆的空间分辨研究
Spatially-Resolved Study of Recombining Plasma in W49B Using XMM-Newton
论文作者
论文摘要
W49B是迄今为止最年轻的SNR，表现出重组等离子体。这种审议的两种普遍理论是通过绝热膨胀或通过相邻冷却介质进行热传导快速冷却。为了限制W49B中血浆的起源，我们对46个区域的深XMM-Newton数据进行了空间分辨的光谱研究。我们采用了一个3组分模型（具有一个ISM和两个弹出组件），我们发现整个SNR中存在重新组合等离子体，从东到西方越来越多。后者的结果与以前的研究一致，我们将西方的监督归因于绝热的扩张。但是，我们的发现与这些先前的作品进行了鲜明对比，因为我们发现东方被监督的证据。当SNR与那里的分子材料相互作用时，我们研究了热传导作为快速冷却的起源的合理性。我们表明，基于估计的时间尺度，通过蒸发块状，浓密的云，比例为0.1-1.0 PC可以解释东方观察到的Oppication oppots的小尺度热传导。
W49B is the youngest SNR to date that exhibits recombining plasma. The two prevailing theories of this overionization are rapid cooling via adiabatic expansion or through thermal conduction with an adjacent cooler medium. To constrain the origin of the recombining plasma in W49B, we perform a spatially-resolved spectroscopic study of deep XMM-Newton data across 46 regions. We adopt a 3-component model (with one ISM and two ejecta components), and we find that recombining plasma is present throughout the entire SNR, with increasing overionization from east to west. The latter result is consistent with previous studies, and we attribute the overionization in the west to adiabatic expansion. However, our findings contrast these prior works as we find evidence of overionization in the east as well. As the SNR is interacting with molecular material there, we investigate the plausibility of thermal conduction as the origin of the rapid cooling. We show that based on the estimated timescales, it is possible that small-scale thermal conduction through evaporation of clumpy, dense clouds with a scale of 0.1-1.0 pc can explain the observed overionization in the east.
