How do external environmental triggers like satellite galaxies influence bar formation?
Answer
They provide tidal forces that act as a trigger for disk instability
While many bars form from internal instabilities, external factors play a significant role. Interactions such as near-misses with other galaxies or tidal forces exerted by smaller satellite galaxies provide the gravitational kick needed to shake a galactic disk. This disturbance can tip an otherwise stable, circular disk into the bar-forming instability mode.
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