The entropy of elliptical galaxies in Coma: a clue for a distance indicator
Astrophysics
2016-01-13 v2
Abstract
We have fitted the surface brightness of a sample of 79 elliptical galaxies pertaining to the Coma cluster of galaxies using the Sersic profile. This model is defined through three primary parameters: scale length (a), intensity (\Sigma_0), and a shape parameter (\nu); physical and astrophysical quantities may be computed from these parameters. We show that correlations are stronger among primary parameters than the classical astrophysical ones. In particular, the galaxies follow a high correlation in \nu and a parameters. We show that the \nu and a correlation satisfies a constant specific entropy condition. We propose to use this entropy relation as distance indicator for clusters.
Cite
@article{arxiv.astro-ph/9701078,
title = {The entropy of elliptical galaxies in Coma: a clue for a distance indicator},
author = {Daniel Gerbal and Gastao B. Lima Neto and Isabel Marquez and Huub Verhagen},
journal= {arXiv preprint arXiv:astro-ph/9701078},
year = {2016}
}
Comments
5 pages, 3 figures, submitted to MNRAS Letters