http://arxiv.org/abs/1909.07757
We discover alignment of galaxies in clusters by analyzing the distribution of their position angles. We assume that galaxies are aligned, if their number at one $90\deg$ interval is more than twice higher than at another $90\deg$ interval. We selected for study the isolated clusters in order to exclude clusters the distribution of the galaxy orientation in which could possibly be altered by gravitational influence of the nearby cluster. Also, we study the galaxy position angle distribution at the outer regions of clusters with small space density where the variation of the position angles in the result of interactions between galaxies is smaller than in the central dens regions used as a control sample. We found that the alignment of galaxies is more often observed in poor clusters. We conclude that originally galaxies were aligned, but in the result of accretion of field galaxies with arbitrary orientation and mutual interactions of galaxies the relative part of aligned galaxies decreases.
H. Tovmassian and J. Torres-Papaqui
Wed, 18 Sep 19
5/64
Comments: 5 pages, 1 figure, submitted to MNRAS