Velocity dispersions of low luminosity ellipticals - L approximately equal to sigma-cubed

Details Velocity dispersions of low luminosity ellipticals - L approximately equal to sigma-cubed Velocity dispersions of low luminosity ellipticals - L approximately equal to sigma-cubed

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...251l...1t&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 251, Dec. 1, 1981, p. L1-L5.

Astronomy and Astrophysics

Astrophysics

68

Elliptical Galaxies, Galactic Structure, Radial Velocity, Stellar Motions, Velocity Distribution, Virgo Galactic Cluster, Stellar Luminosity

Scientific paper

A complete sample of elliptical galaxies in the core of the Virgo cluster is used to derive a relation between stellar velocity dispersion and luminosity. L is found to approximately equal sigma to the nth power, where n = 3.2 + or - 0.2 over two decades of luminosity, with a scatter of 0.38 mag. The possibility of curvature in the relation or rotational support of the galaxies is examined, and a derivation of a law of slope 3 is presented and compared with the derivation for a slope of 4. It is concluded that the lack of increased scatter as the points deviate from a slope of 4 implies that rotation is not important.

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