标题： 无棒S0星系中的非圆环状外盘：NGC 502和NGC 5485 显示英文标题

标题： Noncircular Outer Disks in Unbarred S0 Galaxies: NGC 502 and NGC 5485

摘要： 强非圆环状外星系盘在两个无棒状结构的SA0星系中通过分析恒星旋转的光谱数据和等照度线的形状及取向的光度数据被发现。 在NGC 502中，盘的椭圆畸变表现为两个椭圆环，内环和外环，覆盖从核球到盘以及恒星盘外缘之间的宽径向区域。 这种结构可能是所谓的“干”小合并——无气体卫星的多次吸积的结果。 在NGC 5485中，动力学主轴在盘占主导的区域与等照度线的取向不一致，对于这个星系，得出其整体三轴结构的结论是不可避免的。 显示英文摘要

摘要： Strongly noncircular outer stellar disks have been found in two unbarred SA0 galaxies by analyzing spectroscopic data on the rotation of stars and photometric data on the shape and orientation of the isophotes. In NGC 502, the oval distortion of the disk is manifested as two elliptical rings, the inner and the outer ones, covering wide radial zones between the bulge and the disk and at the outer edge of the stellar disk. Such a structure may be a consequence of the so-called "dry" minor merger - multiple accretion of gas-free satellites. In NGC 5485, the kinematical major axis does not coincide with the orientation of isophotes in the disk-dominated region, and for this galaxy the conclusion about its global triaxial structure is unavoidable.