标题： SNR RCW 86中富含铁的同步辐射喷发物质的X射线研究 显示英文标题

标题： X-Ray Synchrotron Emitting Fe-Rich Ejecta in SNR RCW 86

摘要： 超新星遗迹可能表现出热辐射和非热辐射的X射线辐射。 我们展示了RCW 86的 *钱德拉* 观测结果。 低于1 keV和高于2 keV的X射线形态存在显著差异，表明其物理起源不同。 硬X射线发射与无线电发射区域边缘很好地相关联，这表明这些位置是冲击波的位置，在这些位置，短寿命的X射线发射电子和较长寿命的无线电发射电子都被加速。 软X射线在空间上与非辐射激波的光学发射很好地相关联，这几乎肯定是外向冲击波的部分。 这些软X射线可以用简单的热平面冲击模型很好地拟合。 较硬的X射线显示出Fe K alpha 发射，并且可以用类似的软热成分描述，但其上有主导的2 keV以上的同步加速器连续谱以及强烈的Fe K alpha 线。 对该线及其周围连续谱的定量分析表明，它不能由宇宙丰度等离子体的热辐射产生；低能量中心（6.4 keV）和1 keV以下氧线的缺失都表明电离时间太短。 相反，一个具有同步加速器连续谱的平面冲击进入富含铁的喷出物的模型提供了一个自然的解释。 这意味着逆向冲击必须将电子加速到大约50 TeV的能量。 我们证明了这种能量尺度可以通过逆向冲击处的辐射限制扩散冲击加速来产生。 显示英文摘要

摘要： Supernova remnants may exhibit both thermal and nonthermal X-ray emission. We present Chandra observations of RCW 86. Striking differences in the morphology of X-rays below 1 keV and above 2 keV point to a different physical origin. Hard X-ray emission is correlated fairly well with the edges of regions of radio emission, suggesting that these are the locations of shock waves at which both short-lived X-ray emitting electrons, and longer-lived radio-emitting electrons, are accelerated. Soft X-rays are spatially well-correlated with optical emission from nonradiative shocks, which are almost certainly portions of the outer blast wave. These soft X-rays are well fit with simple thermal plane-shock models. Harder X-rays show Fe K alpha emission and are well described with a similar soft thermal component, but a much stronger synchrotron continuum dominating above 2 keV, and a strong Fe K alpha line. Quantitative analysis of this line and the surrounding continuum shows that it cannot be produced by thermal emission from a cosmic-abundance plasma; the ionization time is too short, as shown both by the low centroid energy (6.4 keV) and the absence of oxygen lines below 1 keV. Instead, a model of a plane shock into Fe-rich ejecta, with a synchrotron continuum, provides a natural explanation. This requires that reverse shocks into ejecta be accelerating electrons to energies of order 50 TeV. We show that maximum energies of this order can be produced by radiation-limited diffusive shock acceleration at the reverse shocks.