Astronomy:Ostriker–Peebles criterion
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In astronomy, the Ostriker–Peebles criterion, named after its discoverers Jeremiah Ostriker and Jim Peebles, describes the formation of barred galaxies.[1]
The rotating disc of a spiral galaxy, consisting of stars and solar systems, may become unstable in a way that the stars in the outer parts of the "arms" are released from the galaxy system, resulting in the collapse of the remaining stars into a bar-shaped galaxy. This occurs in approximately 1/3 of the known spiral galaxies.
Based on the first kinetic energy component T and the total gravitational energy W, a galaxy will become barred when [math]\displaystyle{ \frac{T}{W} \gt 0.15 }[/math].[1]
References
- ↑ 1.0 1.1 Binney, James; Tremaine, Scott (1987). Galactic Dynamics. Princeton University Press. p. 374. ISBN 0-691-08445-9. https://books.google.com/books?id=01yNf7mipb0C&pg=PA374.
External links
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