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Date and Time of the Query: 2019-05-26 T12:37:03 PDT
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For refcode 2004ApJ...601L..33V:
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2004ApJ...601L..33V A Correlation between Light Profile and [Mg/Fe] Abundance Ratio in Early-Type Galaxies Alexandre Vazdekis, Ignacio Trujillo, and Yoshihiko Yamada Abstract. We explore possible correlations between light profile shapes, as parameterized by the Sersic index n or the concentration index C_r_e__(1</NU><DE>3</DE>), and relevant stellar population parameters in early-type galaxies. Mean luminosity-weighted ages, metallicities, and abundance ratios were obtained from spectra of very high signal-to-noise ratio and stellar population models that synthesize galaxy spectra at the resolution given by their velocity dispersions, {sigma}, in combination with an age indicator (H{gamma}_{sigma}_) that is virtually free of the effects of metallicity. We do not find any significant correlation between n [or C_r_e__(<NU>1</NU><DE>3</DE>)] and mean age or metallicity, but we do find a strong positive correlation of the shape parameters with Mg/Fe abundance ratio. This dependence is as strong as the Mg/Fe-{sigma} and C_r_e__(<NU>1/3)-{sigma} relations. We speculate that early-type galaxies settle up their structure on timescales in agreement with those imposed by their Mg/Fe ratios. This suggests that the global structure of larger galaxies, with larger Mg/Fe ratios and shorter timescales, was already in place at high z, without experiencing a significant time evolution. Keywords: Galaxies: Abundances, Galaxies: Clusters: Individual: Name: Virgo, Galaxies: Fundamental Parameters, Galaxies: Photometry, Galaxies: Stellar Content, Galaxies: Structure
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