On Alignment of Galaxies in Clusters
  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 90deg position angle interval is more than twice higher than at another
90deg 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 a 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 at 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 during the cluster evolution the relative part
of aligned galaxies decreases.
