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Home List of Titles Deriving metallicities from the integrated spectra of extragalactic globular clusters using the near-infrared calcium triplet
Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/80903
- Deriving metallicities from the integrated spectra of extragalactic globular clusters using the near-infrared calcium triplet
- Foster, Caroline; Forbes, Duncan A.; Proctor, Robert N.; Strader, Jay; Brodie, Jean P.; Spitler, Lee R.
- The Ca II triplet (CaT) feature in the near-infrared has been employed as a metallicity indicator for individual stars as well as integrated light of Galactic globular clusters (GCs) and galaxies with varying degrees of success, and sometimes puzzling results. Using the DEIMOS multi-object spectrograph on Keck we obtain a sample of 144 integrated light spectra of GCs around the brightest group galaxy NGC 1407 to test whether the CaT index can be used as ametallicity indicator for extragalactic GCs. Different sets of single stellar population models make different predictions for the behavior of the CaT as a function of metallicity. In this work, the metallicities of the GCs around NGC 1407 are obtained from CaT index values using an empirical conversion. The measured CaT/metallicity distributions show unexpected features, the most remarkable being that the brightest red and blue GCs have similar CaT values despite their large difference in mean color. Suggested explanations for this behavior in the NGC 1407 GC system are (1) the CaT may be affected by a population of hot blue stars, (2) the CaT may saturate earlier than predicted by the models, and/or (3) color may not trace metallicity linearly. Until these possibilities are understood, the use of the CaT as a metallicity indicator for the integrated spectra of extragalactic GCs will remain problematic.
- Publication type
- Journal article
- Research centre
- Swinburne University of Technology. Faculty of Information and Communication Technologies. Centre for Astrophysics and Supercomputing
- Astronomical Journal, Vol. 139, no. 4 (Apr 2010), pp. 1566-1578
- Publication year
- FOR Code(s)
- 0201 Astronomical and Space Sciences
- Ca II triplet; Globular clusters; Metallicity; NGC 1407; Star clusters; Spectroscopic techniques
- Institute of Physics Publishing
- Publisher URL
- Copyright © 2010 The American Astronomical Society. All rights reserved. The American Astronomical Society does not allow institutions to archive either the accepted manuscript or the published version of the article. However, you can find an earlier version of the full text here: http://arxiv.org/abs/1002.1107.
- Peer reviewed