Relation between velocity dispersion and central galaxy density in clusters of galaxies
Journal Article
·
· Astrophys. J.; (United States)
A correlation between cluster velocity dispersion and average central galaxy density, N/sup c//sub 0.5/, is reported. The correlation covers the range from rich clusters to small groups of galaxies, or, in terms of velocity dispersion, from v/sub r/approx.1500 to approx.100 km s/sup -1/. The correlation satisfies N/sup c//sub 0.5/roughly-equal21(v/sub r//1000)/sup 1.2/. This result is useful for estimating unknown velocity dispersions in clusters with the aid of the relatively easily determined parameter N/sup c//sub 0.5/. When combined with the virial theorem, the above relation also suggests that the mass-to-light ratio of galaxy systems increases with the system's velocity dispersion.
- Research Organization:
- Princeton University Observatory, Princeton, New Jersey
- OSTI ID:
- 5937380
- Journal Information:
- Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 247:3; ISSN ASJOA
- Country of Publication:
- United States
- Language:
- English
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