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Asymmetric expansion of the Fe ejecta in Kepler’s supernova remnant

机译：开普勒超新星遗迹中铁弹射体的不对称膨胀

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The ejecta kinematics of supernova remnants (SNRs) is one of the crucial clues to understanding the explosion mechanism of type Ia supernovae (SNe). In particular, the kinematic asymmetry of iron-peak elements provides the key to understanding the physical processes taking place in the core of the exploding white dwarfs (WDs), although it has been poorly understood by observations. In this paper, we show for the first time the asymmetric expansion structure in the line-of-sight direction of Fe ejecta in Kepler’s SNR revealed by spectral and imaging analysis using the Chandra archival data. We found that the Kα line centroid energy and line width is relatively lower (6.4?keV) and narrower (～80?eV) around the center of the remnant, which implies that the majority of the Fe ejecta in the central region is redshifted. At the outer regions, we identify bright blueshifted structures as have been ejected as high-velocity dense clumps. Taking into account the broad population of the Fe charge states, we estimate the redshifted velocity of ～2000?km?s?1 and the blueshifted velocity of ～3000?km?s?1 for each velocity structure. We also present the possibility that a portion of the Fe ejecta near the center are interacting with the dense circumstellar medium (CSM) on the near side of the remnant. For the origin of the asymmetric motion of the Fe ejecta, we suggest three scenarios; (1) the asymmetric distribution of the CSM, (2) the “shadow” in Fe cast by the companion star, and (3) the asymmetric explosion.
机译：超新星残留物（SNR）的弹出运动学是理解Ia型超新星（SNe）爆炸机制的关键线索之一。特别是，铁峰元素的运动学不对称性为理解爆炸的白矮星（WDs）核心中发生的物理过程提供了关键，尽管对观测的了解很少。在本文中，我们首次使用Chandra档案数据通过光谱和成像分析揭示了开普勒SNR中Fe射出物视线方向上的不对称膨胀结构。我们发现，Kα线质心能量和线宽在残余中心附近相对较低（<6.4？keV），并且较窄（〜80？eV），这表明中心区域的大多数Fe喷出物都发生了红移。 。在外部区域，我们识别出明亮的蓝移结构，这些结构已被射出为高速密集的团块。考虑到大量的Fe电荷态，我们估计每种速度结构的〜2000？km？s？1的红移速度和〜3000？km？s？1的蓝移速度。我们还提出了这样的可能性，即中心附近的Fe射出部分与残留物近侧的稠密星际介质（CSM）相互作用。对于铁喷射的不对称运动的起源，我们提出了三种情况： （1）CSM的不对称分布，（2）伴随星在铁中投射的“阴影”，以及（3）不对称爆炸。

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