Noncircular Outer Disks in Unbarred S0 Galaxies: NGC 502 and NGC 5485
arXiv:1611.00420 · doi:10.1134/S1063773716030051
Abstract
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.
Slightly edited version of the paper published in Astronomy Letters, March issue; with colored figures
References in corpus (4)
- The Atlas3D project -- XXIX. The new look of early-type galaxies and surrounding fields disclosed by extremely deep optical images
- Kinematics of the Local Universe XIII. 21-cm line measurements of 452 galaxies with the Nançay radiotelescope, JHK Tully-Fisher relation and preliminary maps of the peculiar velocity field
- CALIFA, the Calar Alto Legacy Integral Field Area survey. III. Second public data release
- An extremely low gas-to-dust ratio in the dust-lane lenticular galaxy NGC 5485