The radius-dependence of velocity dispersion in elliptical galaxies

Details The radius-dependence of velocity dispersion in elliptical galaxies The radius-dependence of velocity dispersion in elliptical galaxies

Mar 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.190..873b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 190, Mar. 1980, p. 873-880.

Astronomy and Astrophysics

Astronomy

68

Elliptical Galaxies, Galactic Structure, Stellar Mass, Stellar Models, Brightness, Distribution Functions, Galactic Clusters, Hydrodynamic Equations, Mass Ratios, Radial Velocity

Scientific paper

The equations of stellar hydrodynamics are used to derive the radial variation of velocity dispersion in galaxies whose mass-to-light ratios are constant and whose brightness profiles obey the r to the 1/4 law. It is found that the projected central velocity dispersion in such a system should be about 40 percent lower than the peak velocity dispersion. The observability and physical interpretation of this phenomenon is discussed. There is some evidence that a similar effect has been observed in the structure of rich clusters of galaxies.

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