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arXiv 0712.1071astro-ph
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含{ \sl Chandra}的SNR仙后座A的高空间分辨X射线光谱

High spatial resolution X-ray spectroscopy of SNR Cassiopeia A with {\sl Chandra}

Xue-juan Yang, Fang-jun Lu, Li Chen

备注：
accepted by ChJAA
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摘要：

我们提出了超新星遗迹仙后座A的高空间分辨率X射线光谱与{ \sl钱德拉}观测。该残留物的X射线发射区域被划分为38个$\times$ 34像素，每个像素具有10个$\arcsec$ $\times$ 10个$\arcsec$。创建960个像素的光谱，并用吸收的两组分非平衡电离模型拟合。根据光谱分析结果，我们得到了吸收柱密度、温度、电离年龄和Ne、Mg、Si、S、Ca和Fe的丰度图。Si、S和Ca的丰度分布图显示出明显的喷流结构，而Fe的分布则不沿喷流方向而垂直于喷流方向，在两个数量级左右的范围内，Si、S和Ca的丰度之间存在密切的相关性，表明它们是O爆炸燃烧和不完全Si燃烧的喷出物。同时，Ne和Mg的丰度具有很好的相关性，表明它们是C/Ne爆炸燃烧的灰烬。当Si丰度低于3个太阳丰度时，Fe和Si丰度呈正相关，而当Si丰度高于3个太阳丰度时，Fe和Si丰度呈负相关。我们认为，这种两相相关性是不同的方式，其中铁的合成的结果。

英文摘要：

We present high spatial resolution X-ray spectroscopy of supernova remnant Cassiopeia A with the {\sl Chandra} observations. The X-ray emitting region of this remnant was divided into 38 $\times$ 34 pixels with a scale of 10$\arcsec$ $\times$ 10$\arcsec$ each. Spectra of 960 pixels were created and fitted with an absorbed two component non-equilibrium ionization model. With the spectral analysis results we obtained maps of absorbing column density, temperatures, ionization ages, and the abundances for Ne, Mg, Si, S, Ca and Fe. The Si, S and possibly Ca abundance maps show obviously jet structures, while Fe doesn't follow the jet but seems to be distributed perpendicular to it. In the range of about two orders of magnitude, the abundances of Si, S and Ca show tight correlations between each other, suggesting them to be ejecta from explosive O-burning and incomplete Si-burning. Meanwhile, Ne abundance is well correlated with that of Mg, indicating them to be the ashes of explosive C/Ne burning. The Fe abundance is positively correlated with that of Si when Si abundance is lower than 3 solar abundances, but a negative correlation appears when the Si abundance is higher. We suggest that such a two phase correlation is the results of different ways in which Fe is synthesized.

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