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For refcode 1997MNRAS.285L..41G:
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Copyright by Royal Astronomical Society. 1997MNRAS.285L..41G The entropy of elliptical galaxies in Coma: a clue for a distance indicator D. Gerbal, G. B. Lima Neto, I. Marquez, and H. Verhagen Accepted 1997 January 21. Received 1997 January 20; in original form 1996 August 16 ABSTRACT We have fitted the surface brightnesses of a sample of 79 elliptical galaxies in the Coma cluster using the Sersic profile. This model is defined through three primary parameters: scalelength (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 these primary parameters than among the classical astrophysical ones. In particular, the galaxies follow a high correlation between the v 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. Key words: galaxies: clusters: individual: Coma - galaxies: distances and redshifts - galaxies: elliptical and lenticular, cD - galaxies: fundamental parameters - distance scale.
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