arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1606.01255astro-ph.HEastro-ph.COastro-ph.GA
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用Chandra和XMM-牛顿数据进行边缘检测技术的应用:星系团和更远的星系团

Applications for edge detection techniques using Chandra and XMM-Newton data: galaxy clusters and beyond

S. A. Walker, J. S. Sanders, A. C. Fabian

摘要:

钱德拉X射线天文台无与伦比的空间分辨率使高能天体物理学取得了许多突破。在这里,我们探讨高斯梯度幅度(GGM)过滤的X射线数据,这大大提高了清晰度的表面亮度边缘的X射线观测的应用,并在一定范围内的空间尺度的X射线表面亮度的梯度图。在星系团中,我们发现这种方法能够揭示Abell 2142和Abell 496冷锋背后的显著亚结构,可能是Kelvin Helmholtz不稳定性的结果。在Abell 2319和Abell 3667中,我们证明了GGM滤波器可以提供一种简单的方法来映射冷锋宽度和跳跃率沿冷锋长度的变化。我们目前的结果,从我们正在进行的计划分析钱德拉和XMM-牛顿档案与GGM过滤器。在英仙座星团中,我们发现了一个以前看不见的边缘,从核心向东约850 kpc,位于一个已知的大规模冷锋之外,这可能是一个弓形激波。在MKW 3中,我们发现从星系团核心开始出现不寻常的“V”形表面亮度增强,这可能与活动星系核喷流有关。在蟹状星云中,在环面的外部发现了一个新的移动特征,它以~0.1c的速度在天球平面上移动,并且比钱德拉以前看到的运动距离中央脉冲星更远。

英文摘要:

The unrivalled spatial resolution of the Chandra X-ray observatory has allowed many breakthroughs to be made in high energy astrophysics. Here we explore applications of Gaussian Gradient Magnitude (GGM) filtering to X-ray data, which dramatically improves the clarity of surface brightness edges in X-ray observations, and maps gradients in X-ray surface brightness over a range of spatial scales. In galaxy clusters, we find that this method is able to reveal remarkable substructure behind the cold fronts in Abell 2142 and Abell 496, possibly the result of Kelvin Helmholtz instabilities. In Abell 2319 and Abell 3667, we demonstrate that the GGM filter can provide a straightforward way of mapping variations in the widths and jump ratios along the lengths of cold fronts. We present results from our ongoing programme of analysing the Chandra and XMM-Newton archives with the GGM filter. In the Perseus cluster we identify a previously unseen edge around 850 kpc from the core to the east, lying outside a known large scale cold front, which is possibly a bow shock. In MKW 3s we find an unusual 'V' shape surface brightness enhancement starting at the cluster core, which may be linked to the AGN jet. In the Crab nebula a new, moving feature in the outer part of the torus is identified which moves across the plane of the sky at a speed of ~0.1c, and lies much further from the central pulsar than the previous motions seen by Chandra.

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