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The anisotropy of galaxy orientation in the Coma/A1367 supercluster

ABSTRA C T The spatial orientations of the galactic planes for galaxies in the Coma/A1367 supercluster have been determined. Owing to the ambiguity in the determination of the inclination angle, two possible orientations of the normal to the galaxy plane were found. Two angles, the polar angle d D and the azimuthal angle h , describe the orientation of normals. The distribution of both angles has been checked for isotropy. It is shown that the distribution is not isotropic. The same alignment is observed for samples containing elliptical and lenticular galaxies and for samples containing only spirals, as well as for samples containing galaxies located in different parts of the supercluster. In the case of spiral galaxies, the anisotropy shows that galaxy rotation axes strongly favour alignment with the main plane of the supercluster. The projection of the rotation axes on to the main plane of the supercluster has a preferential direction pointing towards the supercluster, but this effect is weak. A comparison with theory is also presented.