Noncircular outer disks in unbarred S0 galaxies: NGC 502 and NGC 5485статья
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Дата последнего поиска статьи во внешних источниках: 27 ноября 2016 г.
Аннотация:Strongly noncircular outer stellar disks have been found in two unbarred SA0 galaxies by means of 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.