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
- Barred spiral galaxies have bars that extend from the central bulge and connect to the spiral arms.
- The bar structure in these galaxies is thought to influence star formation by funneling gas towards the center.
- Approximately two-thirds of all observed spiral galaxies are classified as barred spirals.
- The central bar can affect the motion and distribution of stars within the galaxy.
- 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?
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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.
