The Cluster of Galaxies Surrounding Cygnus A
The Cluster of Galaxies Surrounding Cygnus A
复制标题
天鹅座 A 周围的星系团
DOI：
10.1086/310908
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
J. Hill
中科院分区：
文献类型：
--
作者：
F. Owen;M. Ledlow;G. Morrison;J. Hill
我们报告了天鹅座 A 周围 22' 平方区域内 41 个星系的光学成像和光谱。结果表明，存在一个与 Cygnus A 相关的广泛的丰富星团，其 Abell 丰富度至少为 1，甚至可能高达 4。速度直方图有两个峰值，一个以 Cygnus A 为中心，另一个更重要的峰值距离 Cygnus A 的速度红移约 2060 km s-1。空间分布的动力质心为也稍微向西北方向移动。然而，统计测试仅显示微弱的证据表明存在两个不同的簇。整个系统的速度离散度为 1581 km s-1，略大于其他经过充分研究的丰富星团的例子。
We report optical imaging and spectroscopy of 41 galaxies in a 22' square region surrounding Cygnus A. The results show that there is an extensive rich cluster associated with Cyg A of Abell richness of at least 1 and possibly as high as 4. The velocity histogram has two peaks, one centered on Cyg A and a more significant peak redshifted by about 2060 km s-1 from the velocity of Cyg A. The dynamical centroid of the spatial distribution is also shifted somewhat to the northwest. However, statistical tests show only weak evidence that there are two distinct clusters. The entire system has a velocity dispersion of 1581 km s-1, which is slightly larger than other, well-studied examples of rich clusters.