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

D. Gerbal | Zendy; G. B. Lima Neto | Zendy; I. Maarquez | Zendy; Huub Verhagen | Zendy

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

Author(s) -

D. Gerbal,

G. B. Lima Neto,

I. Maarquez,

Huub Verhagen

Publication year - 1997

Publication title -

monthly notices of the royal astronomical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.058

H-Index - 383

eISSN - 1365-8711

pISSN - 0035-8711

DOI - 10.1093/mnras/285.4.l41

Subject(s) - physics , astrophysics , coma cluster , galaxy , elliptical galaxy , entropy (arrow of time) , galaxy cluster , quantum mechanics

We have fitted the surface brightness of a sample of 79 elliptical galaxiespertaining to the Coma cluster of galaxies using the Sersic profile. This modelis defined through three primary parameters: scale length (a), intensity(\Sigma_0), and a shape parameter (\nu); physical and astrophysical quantitiesmay be computed from these parameters. We show that correlations are strongeramong primary parameters than the classical astrophysical ones. In particular,the galaxies follow a high correlation in \nu and a parameters. We show thatthe \nu and a correlation satisfies a constant specific entropy condition. Wepropose to use this entropy relation as distance indicator for clusters.Comment: 5 pages, 3 figures, submitted to MNRAS Letter

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