A Spitzer Space Telescope/IRAC Database of Globular Clusters: Calibration of population synthesis models in the mid-IR

Details A Spitzer Space Telescope/IRAC Database of Globular Clusters: Calibration of population synthesis models in the mid-IR A Spitzer Space Telescope/IRAC Database of Globular Clusters: Calibration of population synthesis models in the mid-IR

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3725g&link_type=abstract

Spitzer Proposal ID #3725

Computer Science

Scientific paper

Globular clusters are simple stellar populations which provide fundamental age/metallicity templates for the interpretation of galaxy properties. We are collecting a large, multi-wavelength dataset for a number of Galactic globular clusters and intermediate-age (> 0.5 Gyr), populous clusters in the Large Magellanic Cloud. The dataset will include UV (GALEX), optical (SDSS), and near-IR (2MASS) imaging as well as ground-based spectroscopy from 3800-9000 A. All of the targets have high-quality age and metallicity determinations available. To complete this comprehensive dataset (which will be made available to the community), we propose to obtain high-quality mid-IR IRAC photometry of 24 Galactic and LMC clusters. Our immediate goals are to: (1) use the IRAC measurements of the clusters' integrated light to obtain a unique color-metallicity relation for integrated light measurements in the 2-8 micron region; (2) use the 2MASS and IRAC images to create color-magnitude and color-color diagrams of the bright RGB and AGB stars to quantify the relative contributions of photospheric and circumstellar dust excess emission in the 8-micron passband as a function of metallicity. These data will provide an important empirical baseline for the interpretation of galaxy colors in the mid-IR, as well as a sanity check for synthetic colors produced by population synthesis models.

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