The Universe's Good Neighbors Compact GroupsPresentation Transcript
The Universe's Good Neighbors: Compact Groups Ricardo Bilton and Kalei Sabaratnam
"Compact groups are small systems of several galaxies in a compact configuration on the sky."
Paul Hickson, "Compact Groups of Galaxies."
Properties of Compact Galaxies
Less than 1% of galaxies are in compact groups
A Hickson compact group is 3-6 galaxies that have little distance between them Compact groups contain significantly smaller amounts of spiral and irregular galaxies
Compact Groups - Cosmic Building Blocks?
These groups have existed for billions of years longer than the universe. Their very existence tells us something about the future behavior of galaxies that aren't in compact groups.
Though compact groups are currently identified as containing a relatively small amount of galaxies, these compact groups might move towards one another and become super clusters of tight groups.
Astronomers might be able to predict large-galaxy cluster activity by studying the small compact groups.
When two (or more) become one
When galaxies are so close to one another, they are bound to collide.
Galaxy collisions usually result in the disruption of the overall shape of the galaxy. "The parents disappear into their offspring." Because stars are very far apart, gas clouds are more likely to interact when two galaxies collide. Star bursts sometimes result from galaxy collision.