Estimating distances to elliptical galaxies with a mass-luminosity relation

Astronomy and Astrophysics – Astronomy

Scientific paper

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Galaxies: Distances And Redshifts, Galaxies: Elliptical And Lenticular, Cd, Galaxies: Fundamental Parameters, Galaxies: Photometry, Distance Scale

Scientific paper

We argue that the physical reason for the success of the Fundamental Plane and the D_n-sigma relation as distance estimators for elliptical galaxies is the existence of a relation between luminosity and mass with small intrinsic scatter. Therefore a better understanding of the luminosity and mass variables, and of the mass-luminosity relation, is needed to improve distance estimation for elliptical galaxies. We propose a distance indicator in the form of a mass-luminosity relation and use it to derive modifications to the Fundamental Plane and to the D_n-sigma relation. Note that distances estimated with these modified Fundamental Plane and D_n-sigma relations may, in practice, turn out to be less precise than those estimated with the standard relations when the added terms have large observational errors.

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