用Swift XRT在星系团中的气体温度廓线：观测和绘制R200附近地图的能力
Gas temperature profiles in galaxy clusters with Swift XRT: observations and capabilities to map near R200
摘要：
我们调查的可能性，使用X射线望远镜（XRT）上的斯威夫特卫星，以提高目前的准确性ICM温度测量的区域接近附近的星系团的维里半径。本文对6个星系团的Swift XRT观测数据进行了光谱分析，并给出了它们在0.2-0.6 r200范围内的温度分布。其中四个是附近著名的和非常好的研究对象（昏迷，阿贝尔1795，阿贝尔2029和PKS 0745 -19）。剩下的两个，SWJ 1557 +35和SWJ 0847 +13，在红移z=0.16和z=0.36，被Swift-XRT偶然观察到。我们准确地量化了温度的不确定性，特别关注背景散射（仪器和宇宙）的影响。我们外推这些结果，并模拟深观察的外部区域的阿贝尔1795年，这是假设在这里作为一个案例研究。特别是，我们计算的预期不确定性的温度测量到r200。我们发现，通过相当深的观测（300 ks），Swift XRT将能够测量远至维里半径的外部区域的ICM温度分布，显着提高了以前测量的最佳精度。这要归功于全视场良好PSF和对仪器背景非常准确的控制的前所未有的结合。出乎意料的是，我们得出的结论是，在目前运行的望远镜中，Swift-XRT是唯一有可能提高目前在集群电位边缘等离子体温度测量精度的望远镜。在新一代的低背景和大视场望远镜（旨在研究星系团）投入使用之前，这将是正确的。这些观测对于制定此类任务的观测战略具有重要意义。
英文摘要：
We investigate the possibility of using the X-ray telescope (XRT) on board the Swift satellite to improve the current accuracy of the ICM temperature measurements in the region close to the virial radius of nearby clusters. We present the spectral analysis of the Swift XRT observations of 6 galaxy clusters and their temperature profiles in the regions within 0.2-0.6 r200. Four of them are nearby famous and very well studied objects (Coma, Abell 1795, Abell 2029 and PKS0745-19). The remaining two, SWJ1557+35 and SWJ0847+13, at redshift z=0.16 and z=0.36, were serendipitously observed by Swift-XRT. We accurately quantify the temperature uncertainties, with particular focus on the impact of the background scatter (both instrumental and cosmic). We extrapolate these results and simulate a deep observation of the external region of Abell 1795 which is assumed here as a case study. In particular we calculate the expected uncertainties in the temperature measurement as far as r200. We find that, with a fairly deep observation (300 ks), the Swift XRT would be able to measure the ICM temperature profiles in the external regions as far as the virial radius, significantly improving the best accuracy among the previous measurements. This can be achieved thanks to the unprecedented combination of good PSF over the full field of view and very accurate control of the instrumental background. Somehow unexpectedly we conclude that, among currently operating telescope, the Swift-XRT is the only potentially able to improve the current accuracy in plasma temperature measurement at the edges of the cluster potential. This will be true until a newgeneration of low-background and large field of view telescopes, aimed to the study of galaxy clusters, will operate. These observations would be of great importance in developing the observing strategy for suchmissions.
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