arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0810.0009astro-ph
收藏

钱德拉超新星遗迹的解剖工具:方法及其在银河系遗迹W49B中的应用

Tools for Dissecting Supernova Remnants Observed with Chandra: Methods and Application to the Galactic Remnant W49B

Laura A. Lopez, Enrico Ramirez-Ruiz, David A. Pooley, Tesla E. Jeltema

摘要:

我们介绍的方法来量化的X射线形态的超新星遗迹观测钱德拉X射线望远镜。这些方法包括测量形态不对称性的功率比技术,探测化学偏析和分布的相关长度分析,以及量化X射线子结构的小波变换分析。我们证明了这些技术的实用性和准确性相关的合成数据。此外,我们显示的方法的能力,将其应用到55-ks钱德拉ACIS观测银河系超新星遗迹W 49 B。我们分析了W 49 B中突出发射线的图像,并使用结果来辨别物理性质。我们发现,铁的形态是非常不同的其他元素:它是统计上更不对称,更隔离,并有25%以上的发射子结构比轻离子。相比之下,硅、硫、氩和钙混合良好,各向同性更强,并且具有更小的相等尺寸的发射子结构。基于在被确定为富铁和贫铁的区域中的XMM-牛顿光谱的拟合,我们确定W 49 B中的铁必须是各向异性喷射的。我们测量了许多地区的丰度比,我们发现在整个遗迹中,大的局部变化是持久的。我们比较的平均值,全球丰度比预测的球形和双极核心坍缩爆炸,结果是一致的,从25太阳质量的祖双极起源。我们从铁的发射子结构的体积计算铁的填充因子,从而比以前的研究更精确地估计质量。总的来说,这项工作是严格描述超新星遗迹的物理性质的第一步,以便在源内部和源之间进行比较。

英文摘要:

We introduce methods to quantify the X-ray morphologies of supernova remnants observed with the Chandra X-ray Telescope. These include a power-ratio technique to measure morphological asymmetries, correlation-length analysis to probe chemical segregation and distribution, and wavelet-transform analysis to quantify X-ray substructure. We demonstrate the utility and accuracy of these techniques on relevant synthetic data. Additionally, we show the methods' capabilities by applying them to the 55-ks Chandra ACIS observation of the galactic supernova remnant W49B. We analyze the images of prominent emission lines in W49B and use the results to discern physical properties. We find that the iron morphology is very distinct from the other elements: it is statistically more asymmetric, more segregated, and has 25% larger emitting substructures than the lighter ions. Comparatively, the silicon, sulfur, argon, and calcium are well-mixed, more isotropic, and have smaller, equally-sized emitting substructures. Based on fits of XMM-Newton spectra in regions identified as iron rich and iron poor, we determine that the iron in W49B must have been anisotropically ejected. We measure the abundance ratios in many regions, and we find that large, local variations are persistent throughout the remnant. We compare the mean, global abundance ratios to those predicted by spherical and bipolar core-collapse explosions; the results are consistent with a bipolar origin from a 25 solar mass progenitor. We calculate the filling factor of iron from the volume of its emitting substructures, enabling more precise mass estimates than previous studies. Overall, this work is a first step toward rigorously describing the physical properties of supernova remnants for comparison within and between sources.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑