The Motions of Clusters of Galaxies and the Dipoles of the Peculiar Velocity Field
The Motions of Clusters of Galaxies and the Dipoles of the Peculiar Velocity Field
复制标题
星系团的运动和奇异速度场的偶极子
DOI：
10.1086/300652
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
W. Freudling
中科院分区：
文献类型：
--
作者：
R. Giovanelli;M. Haynes;J. Salzer;G. Wegner;L. N. da Costa;W. Freudling
在本系列的前几篇论文中，我们得到了径向速度在1000 ~ 9200 km s-1（SCI样本）的24个星系团的TF关系，构造了Tully-Fisher（TF）模板关系，并得到了每个星系团相对于模板的平均偏移量。在这里，估计的视线的特殊速度的集群及其相关的误差。结果表明，在宇宙微波背景参考系中，星团特有速度不超过600 km s-1，其分布具有300 km s-1的视距色散，表明星团特有速度场比以前报道的更为平静。当在本星系群处于静止状态的参考系中测量时，cz > 3000 km s-1的星系团在振幅和顶点方向上的偶极矩与CMB一致。据估计，在宇宙微波背景参考系中，半径为6000 km s-1的球体的整体流量在140 km s-1和320 km s-1之间。
In preceding papers of this series, TF relations for galaxies in 24 clusters with radial velocities between 1000 and 9200 km s-1 (SCI sample) were obtained, a Tully-Fisher (TF) template relation was constructed, and mean offsets of each cluster with respect to the template were obtained. Here, an estimate of the line-of-sight peculiar velocities of the clusters and their associated errors are given. It is found that cluster peculiar velocities in the cosmic microwave background reference frame do not exceed 600 km s-1 and that their distribution has a line-of-sight dispersion of 300 km s-1, suggesting a more quiescent cluster peculiar velocity field than previously reported. When measured in a reference frame in which the Local Group is at rest, the set of clusters at cz > 3000 km s-1 exhibits a dipole moment in agreement with that of the CMB, both in amplitude and apex direction. It is estimated that the bulk flow of a sphere of 6000 km s-1 radius in the CMB reference frame is between 140 and 320 km s-1.