NOAO >   Observing Info >   Approved Programs >   2006A-0362

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Proposal Information for 2006A-0362


PI: Steve Zepf, Michigan State University, zepf@pa.msu.edu
Address: Dept. of Physics and Astronomy, East Lansing, MI 48824, USA

CoI: Arunav Kundu, Michigan State University
CoI: Katherine Rhode, Wesleyan University/Yale University
CoI: Maren Hempel, Michigan State University
CoI: Doug Geisler, Universidad de Concepcion

Title: Wide-Field K-band Imaging of NGC 3379 and Its Globular Cluster System

Abstract: We propose to obtain wide-field K-band imaging of the nearby elliptical galaxy NGC 3379. We will combine these near-ir data with our published Mosaic optical data and wide-field spectroscopy to constrain the metallicities and ages of its globular clusters (GCs). These data will particularly allow us to test whether a recently discovered population of GCs at large distances from the center of NGC 3379 that have red optical colors and radial velocities that clearly associate them with NGC 3379 are truly old, very metal-rich GCs far in the halo of NGC 3379. Such a result is unexpected in current models of the formation of globular cluster systems and their host galaxies, and has important implications for the early enrichment history of elliptical galaxies. A very deep Chandra program is also centered on NGC 3379, for which the proposed K-band observations will provide near-ir identifications of the Chandra sources. Specifically, for the Chandra sources in GCs, we will investigate the dependence of X-ray binary formation on GC metallicity, age, and luminosity, and for the Chandra sources that are AGN in background galaxies, the optical and near-ir colors will help characterize the host galaxy population in this very deep X-ray dataset.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2006A-0362

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