The entropy of elliptical galaxies in Coma: a clue for a distance indicator

Details The entropy of elliptical galaxies in Coma: a clue for a distance indicator The entropy of elliptical galaxies in Coma: a clue for a distance indicator

1997-01-14

arxiv.org/abs/astro-ph/9701078v2

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures, submitted to MNRAS Letters

Scientific paper

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.

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