Some aspects of the orientation of galaxies in clusters

Abstract

The analysis of Tully’s groups of galaxies belonging to the Local Supercluster (LSC) was performed. In the 1975 Hawley and Peebles [D. I. Hawley, P. J. E. Peebles, Astron. J. 80, 477 (1975)] presented the method for investigations of the galaxies orientation in the large structures. In our previous papers [W. God lowski, P. Piwowarska, E. Panko, P. Flin, Astron. J. 723, 985 (2010); W. God lowski, Astrophys. J. 747, 7 (2012)] the statistical test proposed by Hawley and Peebles for the investigation of this problem was analyzed in detail and some improvements were suggested. On this basis the new method of the analysis of galactic alignment in clusters was proposed. Using this method, God lowski [W. God lowski, Acta Phys. Polon. B 42, 2323 (2011)] analyzed the orientation of galaxies inside Tully’s groups founding no significant deviations from isotropy both in orientation of position angles and D and angles as well, giving the spatial orientation of galaxy planes. In the present paper we examined carefully and methodically the dependence of alignment in Tully’s groups on the morphological type of galaxies. Moreover, we discussed the consequences of dierent approximation of “true shape” of the galaxies for dierent morphological types, a possible influence of this problem for the investigation of spatial orientation of galaxies. In addition, we discussed the implications of the obtained results for the theory of galaxy formation as well.