Tests of Chemical Enrichment Scenarios in Ellipticals Using Continuum Colors and Spectroscopy

Details Tests of Chemical Enrichment Scenarios in Ellipticals Using Continuum Colors and Spectroscopy Tests of Chemical Enrichment Scenarios in Ellipticals Using Continuum Colors and Spectroscopy

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aj....137..528s&link_type=abstract

The Astronomical Journal, Volume 137, Issue 1, pp. 528-536 (2009).

Astronomy and Astrophysics

Astronomy

2

Galaxies: Elliptical And Lenticular, Cd, Galaxies: Evolution, Galaxies: Stellar Content

Scientific paper

We combine spectroscopic metallicity values with integrated narrowband continuum colors to explore the internal metallicity distribution in early-type galaxies. The different techniques for determining metallicity (indices versus colors) allow for an estimate of the contribution from metal-poor stars in a predominantly metal-rich population, which, in turn, places constraints on the shape and width of a galaxy's metallicity distribution function. The color-spectroscopic data are compared with the closed box, infall, and inhomogeneous chemical evolution models. The G-dwarf problem, a deficiency in metal-poor stars as compared with closed-box models, is evident in the data set and indicates that this deficiency is common to all early-type galaxies. However, even simple infall models predict galaxy colors that are too blue compared with the observations. A simple analytical model is proposed that matches the elliptical data and recent Hubble Space Telescope observations of M31 and NGC 5128 by reducing the number of metal-poor stars in a systematic fashion. Without physical justification, the shape of these models is similar to predictions of inhomogeneous enrichment scenarios.

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