The environmental dependence of the Mg2 correlations for elliptical galaxies

Details The environmental dependence of the Mg2 correlations for elliptical galaxies The environmental dependence of the Mg2 correlations for elliptical galaxies

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.257..187g&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 257, no. 2, July 15, 1992, p. 187-194. Research support

Astronomy and Astrophysics

Astronomy

73

Elliptical Galaxies, Galactic Clusters, Magnesium, Abundance, Astronomical Photometry, Correlation, Galactic Evolution, Halos, Metallicity, Star Formation

Scientific paper

New measurements of Mg2 for Coma cluster ellipticals were made in order to assess the level of any environmental dependence in the fundamental relationships of early-type galaxies, with emphasis on ellipticals that lie in the outer areas of the cluster. The sigma-Mg2 and D-Mg2 relations are compared for ellipticals located in the inner region of the cluster and in the cluster halo. It is shown that the Mg2 correlations possess a small environmental effect. From the sigma-Mg2 relation, it is found that halo ellipticals have, on average, for a given sigma, Mg2 lower by 0.017 +/-0/005 mag compared to inner ellipticals. A similar effect is observed in the D-Mg2 relation. At a fixed D, ellipticals in the cluster halo have, on average, Mg2 lower by 0.025 +/-0.008 mag. The possibility that the observed offsets in the sigma-Mg2 and D-Mg2 relations are caused by star formation continuing to a more recent epoch in halo ellipticals is also investigated.

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