Disc galaxy
A disc galaxy (or disk galaxy) is a galaxy characterized by a galactic disc, a flattened circular volume of stars.[1] These galaxies may or may not include a central non-disc-like region (a galactic bulge).[2]
The Sculptor Galaxy (NGC 253) is a disk galaxy
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
- "Disk Galaxies | COSMOS". astronomy.swin.edu.au.
- "The Galactic Bulge". burro.case.edu.
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| Active nuclei |
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| Energetic galaxies | |
| Low activity |
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