A more precise Lsigma distance indicator.
Abstract
In a recent paper, Dressler (1984) derived the L versus log(σ) and L versus Mg_{2} relations for ellipticals in the Virgo and Coma clusters and used these relations to derive an accurate ComaVirgo distance. Dressler adopted V_{26} magnitudes to represent the luminosities of the individual ellipticals. By using published photoelectric photometry the author has explored the consequences of using magnitudes derived from constantsize, relatively small (i.e. a few kpc) apertures in these relations. The rootmeansquares scatter about the L(aperture) relations is considerably smaller than that found for the L(V_{26}) relations. The author shows how the L(aperture) relations can be used to measure relative cluster distances. By comparing the L(aperture) versus log(σ) relations of the Coma and Virgo ellipticals, he derives a relative distance modulus of 3.76±0.12 mag. The error in this determination is a factor of ≡1.7 lower than that obtained from the L(V_{26}) versus log(σ) relations with the same set of galaxies.
 Publication:

Monthly Notices of the Royal Astronomical Society
 Pub Date:
 September 1986
 DOI:
 10.1093/mnras/222.3.417
 Bibcode:
 1986MNRAS.222..417L
 Keywords:

 Computational Astrophysics;
 Distance;
 Elliptical Galaxies;
 Galactic Clusters;
 Mass To Light Ratios;
 Electrophotometry;
 Luminosity;
 Regression Analysis;
 RootMeanSquare Errors;
 Astrophysics