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Title:
Near-Infrared Spectral Diagnostics for Unresolved Stellar Populations
Authors:
Cesetti, M.; Ivanov, V. D.; Morelli, L.; Pizzella, A.
Publication:
Formation and Evolution of Galaxy Disks ASP Conference Series, Vol. 396, Proceedings of the conference held 1-5 October, 2007 at the Centro Convegni Matteo Ricci, Rome, Italy. Edited by José G. Funes, S.J., and Enrico Maria Corsini. San Francisco: Astronomical Society of the Pacific, 2008., p.137
Publication Date:
10/2008
Origin:
ASPC
Bibliographic Code:
2008ASPC..396..137C

Abstract

We want to develop spectral diagnostics of stellar populations in the near-infrared (NIR), for unresolved stellar populations. We created a semi-empirical population model and we compare the model output with the observed spectra of a sample of elliptical and bulge-dominated galaxies that have reliable Lick-indices from literature to test if the correlation between Mg_2 and CO 1.62 μm remains valid in galaxies and to calibrate it as an abundance indicator. We find that (1) there are no significant correlations between any NIR feature and the optical Mg_2; (2) the Ca I, Na I and CO trace the α-enhancement; and (3) the NIR absorption features are not influenced by the galaxy age.
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