Integrated stellar populations: Confronting photometry with spectroscopy

Lauren A. MacArthur, Michael McDonald, Stéphane Courteau, J. Jesús González

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

We investigate the ability of spectroscopic techniques to yield realistic star formation histories (SFHs) for the bulges of spiral galaxies based on a comparison with their observed broadband colors. Full spectrum fitting to optical spectra indicates that recent (within ∼1 Gyr) star formation activity can contribute significantly to the V-band flux, whilst accounting for only a minor fraction of the stellar mass budget which is made up primarily of old stars. Furthermore, recent implementations of stellar population (SP) models reveal that the inclusion of a more complete treatment of the thermally pulsating asymptotic giant branch (TP-AGB) phase to SP models greatly increases the NIR flux for SPs of ages 0.2-2 Gyr. Comparing the optical-NIR colors predicted from population synthesis fitting, using models which do not include all stages of the TP-AGB phase, to the observed colors reveals that observed optical-NIR colors are too red compared to themodel predictions.However,when a 1Gyr SP frommodels including a full treatment of the TP-AGB phase is used, the observed and predicted colors are in good agreement. This has strong implications for the interpretation of stellar populations, dust content, and SFHs derived from colors alone.

Original languageEnglish (US)
Pages (from-to)768-773
Number of pages6
JournalAstrophysical Journal
Volume718
Issue number2
DOIs
StatePublished - Aug 1 2010
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Galaxies: bulges
  • Galaxies: evolution
  • Galaxies: formation
  • Galaxies: stellar content

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