Solving the Ca II Triplet Puzzle for Elliptical Galaxies

Details Solving the Ca II Triplet Puzzle for Elliptical Galaxies Solving the Ca II Triplet Puzzle for Elliptical Galaxies

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915210m&link_type=abstract

American Astronomical Society, AAS Meeting #219, #152.10

Astronomy and Astrophysics

Astronomy

Scientific paper

The Ca II triplet is a prominent absorption-line feature in the near-infrared spectrum of cool stars. In elliptical galaxies, it has been shown to be nearly age independent for stellar populations older than a few gigayears. Along with the strong dependence of the Ca II Triplet on metallicity and when combined with new infrared spectrometers, the Ca II Triplet could provide a means to measure metallicities in high redshift galaxies. However, recent observations of the index in nearby galaxies has shown that it is lower than expected from simple stellar population modeling. We show that after accounting for composite stellar populations and local galaxy environments, the Ca II Triplet is entirely in-line with synthesis models.

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