Spatially resolved X‐ray spectroscopy of the core of the Centaurus cluster
Spatially resolved X‐ray spectroscopy of the core of the Centaurus cluster
复制标题
半人马座星团核心的空间分辨 X 射线光谱
DOI：
10.1046/j.1365-8711.2002.05211.x
复制
发表时间：
2001
影响因子：
4.8
通讯作者：
A. Fabian
中科院分区：
文献类型：
--
作者：
J. Sanders;A. Fabian
ABSTRA C T我们提出了钱德拉数据从31.7-ks观察半人马座星系团，使用ACIS-S探测器。X射线辐射的图像显示在星团中心有一个类似羽状的特征，范围为60弧秒（投影为20千秒差距）。该特征与半径相似的气体具有相同的金属性，但温度更低。使用自适应分箱，我们生成的温度，丰度和吸收的集群核心的地图。径向丰度分布图显示，先前已知的陡峭丰度梯度峰值的金属丰度为1：3 - 1：8 Z（半径约为45 arcsec（15 kpc）），然后回落到0.4 Z（在集群中心）。径向温度分布图表明，温度向内降低。我们确定的空间分布的两个温度分量，在适用的情况下。内10弧秒（3 kpc）内较冷部件的辐射冷却时间小于2 × 10 - 7年。图像中的X射线孔与射电瓣重合，以及两个外部急剧的温度下降，或冷锋。烟羽的来源尚不清楚。强丰度梯度的存在是对由中心射电源驱动的广泛对流或气体运动的强约束。
ABSTRA C T We present Chandra data from a 31.7-ks observation of the Centaurus cluster, using the ACIS-S detector. Images of the X-ray emission show a plume-like feature at the centre of the cluster, of extent 60 arcsec (20 kpc in projection). The feature has the same metallicity as gas at a similar radius, but is cooler. Using adaptive binning, we generate temperature, abundance and absorption maps of the cluster core. The radial abundance profile shows that the previously known, steep abundance gradient peaks with a metallicity of 1: 3‐1 : 8Z ( at a radius of about 45 arcsec (15 kpc), before falling back to 0.4 Z( at the centre of the cluster. A radial temperature profile shows that the temperature decreases inwards. We determine the spatial distributions of each of two temperature components, where applicable. The radiative cooling time of the cooler component within the inner 10 arcsec (3 kpc) is less than 2 £ 10 7 yr. X-ray holes in the image coincident with the radio lobes are seen, as well as two outer sharp temperature drops, or cold fronts. The origin of the plume is unclear. The existence of the strong abundance gradient is a strong constraint on extensive convection or gas motion driven by a central radio source.