Disc galaxy
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A disc galaxy is a galaxy characterized by a disc, a flattened circular volume of stars. These galaxies may or may not include a central non-disc-like region (a galactic bulge).
Junko Ueda[who?] observed that galaxy collisions result in disc galaxies, within 40 million light years from the Earth. While the galaxies are interacting, they change shape in cosmic time as they merge.[1]
Disc galaxy types include:
- spiral galaxies
- unbarred spiral galaxies (types S, SA)
- barred spiral galaxies (type SB)
- intermediate spiral galaxies (type SAB)
- lenticular galaxies (types E8, S0, SA0, SB0, SAB0)
Galaxies that are not disc types include:
- elliptical galaxies (type dE)
- irregular galaxies (type dI)
References
- ^ "Violent Origins of Disc Galaxies". Phys.
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