Barred spiral galaxy

Definition

A barred spiral galaxy is a type of spiral galaxy with a central bar-shaped structure composed of stars. The Milky Way is an example of a barred spiral galaxy.

5 Must Know Facts For Your Next Test

1. Barred spiral galaxies have bars that extend from the central bulge and connect to the spiral arms.
2. The bar structure in these galaxies is thought to influence star formation by funneling gas towards the center.
3. Approximately two-thirds of all observed spiral galaxies are classified as barred spirals.
4. The central bar can affect the motion and distribution of stars within the galaxy.
5. The Milky Way's status as a barred spiral was confirmed through infrared observations.

Review Questions

• What distinguishes a barred spiral galaxy from other types of spiral galaxies?
• How does the bar structure in a barred spiral galaxy impact star formation?
• What percentage of observed spiral galaxies are classified as barred spirals?

Related terms

Spiral Galaxy: A type of galaxy characterized by its winding, often symmetrical arms that extend from a central bulge.

Elliptical Galaxy: A type of galaxy with an ellipsoidal shape and a smooth, nearly featureless brightness profile.

Central Bulge: The dense, central region of a galaxy containing older stars and often housing supermassive black holes.