Merger

Definition

A merger is the process where two or more galaxies collide and combine to form a single, larger galaxy. This event significantly influences the structure and evolution of the resulting galaxy.

5 Must Know Facts For Your Next Test

1. Galaxy mergers can trigger intense periods of star formation known as starbursts.
2. Mergers are often responsible for the formation of elliptical galaxies from spiral galaxies.
3. The supermassive black holes at the centers of merging galaxies may also merge, forming an even larger black hole.
4. Tidal forces during a merger can create long tails of stars and gas that extend far into space.
5. Mergers can activate or fuel active galactic nuclei (AGN) by funneling gas toward the central supermassive black hole.

Review Questions

Related terms

Starburst Galaxy: A galaxy experiencing an exceptionally high rate of star formation

Elliptical Galaxy:

A type of galaxy characterized by an ellipsoidal shape and a smooth, nearly featureless brightness profile

Active Galactic Nucleus (AGN): The extremely luminous central region of some galaxies, powered by accretion onto a supermassive black hole