Galactic cannibalism

Definition

Galactic cannibalism occurs when a larger galaxy merges with and absorbs a smaller galaxy. This process significantly alters the structure and composition of both galaxies involved.

5 Must Know Facts For Your Next Test

1. The Milky Way is currently merging with several smaller galaxies, including the Sagittarius Dwarf Galaxy.
2. Tidal forces during galactic cannibalism can trigger star formation in both the larger and smaller galaxies.
3. Evidence of past galactic cannibalism events includes stellar streams and disrupted structures within galaxies.
4. Supermassive black holes at the centers of merging galaxies can also merge, releasing immense amounts of energy.
5. Galactic cannibalism plays a crucial role in the growth and evolution of large elliptical galaxies.

Review Questions

• What observable features might indicate that a galaxy has undergone galactic cannibalism?
• How does galactic cannibalism influence star formation within the interacting galaxies?
• What role do supermassive black holes play in the process of galactic cannibalism?

Related terms

Galaxy Merger:

The process where two or more galaxies collide and coalesce to form a single, larger galaxy

Tidal Forces:

Gravitational interactions that distort shapes and trigger various astrophysical phenomena during close encounters between celestial bodies

Stellar Stream: A trail of stars left behind from a smaller galaxy being torn apart by gravitational forces during a merger