Spatial orientations of galaxies in 10 Abell clusters of BM type II-III

被引:23
作者
Aryal, B
Saurer, W
机构
[1] Univ Innsbruck, Inst Astrophys, A-6020 Innsbruck, Austria
[2] Tribhuvan Univ, Cent Dept Phys, Kathmandu, Nepal
关键词
galaxies : evolution; galaxies : formation; galaxies : spiral; galaxies : statistics;
D O I
10.1111/j.1365-2966.2005.09667.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present an analysis of the spatial orientations of 1315 galaxies in 10 Abell clusters of BM type II-III (type II-III in the Bautz-Morgan system). It is found that the spin-vector orientations of the galaxies in six clusters (Abell 168, 426, 1035, 1227, 1367 and 1904) tend to lie parallel to the Local Supercluster (LSC) plane. The spin-vector projections of galaxies in six clusters (Abell 168, 1020, 1035, 1227, 1904 and 1920) are found to be oriented perpendicular with respect to the direction of the LSC centre. Three clusters (Abell 1920, 2255 and 2256) show a bimodal orientation: spin vectors tend to be oriented both parallel and perpendicular to the LSC plane. No dependence of radial velocity, distance and cluster magnitude on galaxy orientation is noticed. In a comparison with previous work, we noticed that the anisotropy might increase from early-type (BM type I) to late-type (BM types II-III and III) clusters. We notice a vanishing angular momentum for the less massive galaxy clusters (richness class 0). A significant alignment of the angular momenta of galaxies for massive clusters, e.g. the core of the Shapley Supercluster (richness class 4, M > 10(15) M-circle dot), is found.
引用
收藏
页码:438 / 448
页数:11
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