Testing Stellar Populations Models with IRAC Observations of Intermediate-Age Globular Clusters in NGC~4365

Details Testing Stellar Populations Models with IRAC Observations of Intermediate-Age Globular Clusters in NGC~4365 Testing Stellar Populations Models with IRAC Observations of Intermediate-Age Globular Clusters in NGC~4365

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3547z&link_type=abstract

Spitzer Proposal ID #3547

Mathematics

Logic

Scientific paper

We propose to obtain IRAC images of the nearby elliptical galaxy NGC 4365 and its intermediate age globular cluster subsystem. The proposed Spitzer observation, along with extensive existing HST and ground-based data, will allow important tests of models of stellar populations with high metallicities and intermediate ages. This is a critical parameter space for interpreting observations of early-type galaxies at cosmological distances. NGC 4365 is a key testing ground for the behavior of simple stellar populations at high metallicities and intermediate ages because of its rich and well-defined population of globular clusters with ages of 3-5 Gyr and metallicities ranging from slightly subsolar to supersolar. The globular clusters of NGC 4365 have already been extensively studied with HST WFPC2, ACS, and NICMOS observations, as well as 8-10m ground-based spectroscopy and photometry. The proposed IRAC photometry extends this dataset to longer wavelengths and offers an efficient test whether models of simple stellar populations accurately reproduce observations in the IRAC bands for an important set of ages and metallicities.

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