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| Paper: |
Lopsidedness in Disk Galaxies |
| Volume: |
396, Formation and Evolution of Galaxy Disks |
| Page: |
357 |
| Authors: |
Dury, V.; De Rijcke, S.; Debattista, V.P.; Dejonghe, H. |
| Abstract: |
A lopsided structure is often seen in spiral galaxies. This lopsidedness can be caused by a dynamical instability that occurs in the stellar component of an initially axisymmetric system. The counter-rotation instability can produce a lopsided structure although counter-rotation is only rarely detected in disk galaxies. Therefore we have examined whether lopsided instabilities can be found in fully rotating disks. Models with no net rotation show a strong lopsided mode and a weaker pair of counter-rotating bars. Fully rotating models show a strong two-armed spiral and a weaker one-armed spiral. In the non-rotating models, the m = 1 mode becomes weaker when there is less counter-rotation, while in the rotating models, it becomes stronger. |
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