Near-infrared spectroscopic indices for unresolved stellar populations. II. Index measurements
D. Gasparri,
L. Morelli,
V. D. Ivanov
et al.
Abstract:We measured the equivalent width of a large set of near-infrared (NIR, 0.8-2.4 µm) line-strength indices in the XShooter medium-resolution spectra of the central regions of 14 galaxies. We found that two aluminum indices Al at 1.31 µm and Al1 at 1.67 µm and the two CO indices CO1 at 1.56 µm and CO4 at 1.64 µm are tightly correlated with the velocity dispersion. Moreover, the NIR Al and CO1 indices show strong correlations with the optical Mg2 and Mgb indices, which are usually adopted as alpha/Fe-enhancement d… Show more
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