Ages and metallicities of faint red galaxies in the Shapley Supercluster

Details Ages and metallicities of faint red galaxies in the Shapley Supercluster Ages and metallicities of faint red galaxies in the Shapley Supercluster

2007-12-03

arxiv.org/abs/0712.0274v1

Astronomy and Astrophysics

Astrophysics

Four pages, three figures; To appear in Proceedings of IAU Symp. 245 "Formation and Evolution of Galaxy Bulges", (Oxford, July

Scientific paper

10.1017/S1743921308018255

We present results on the stellar populations of 232 quiescent galaxies in the Shapley Supercluster, based on spectroscopy from the AAOmega spectrograph at the AAT. The key characteristic of this survey is its coverage of many low-luminosity objects (sigma ~ 50 km/s), with high signal-to-noise (~45 per Angstrom). Balmer-line age estimates are recovered with ~25% precision even for the faintest sample members. We summarize the observations and absorption line data, and present correlations of derived ages and metallicities with mass and luminosity. We highlight the strong correlation between age and alpha-element abundance ratio, and the anti-correlation of age and metallicity at fixed mass, which is shown to extend into the low-luminosity regime.

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