NOAO >   Observing Info >   Approved Programs >   2012A-0155

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Proposal Information for 2012A-0155


PI: Jonathan R. Hargis, Indiana University, jhargis@astro.indiana.edu
Address: Department of Astronomy, 727 East Third Street, Bloomington, IN 47405, USA

CoI: Katherine L. Rhode, Indiana University

Title: Probing Giant Galaxy Formation with Mosaic Imaging of Globular Cluster Systems

Abstract: We propose to use the KP-4m and Mosaic to obtain wide-field images of nearby cluster and group elliptical and S0 galaxies, in order to study their globular cluster (GC) populations out to large radii. Any theory of how galaxies form and evolve must be consistent with the properties of the galaxy's GC system, so accurate measurements of the \it global properties of GC systems are valuable for understanding galaxy origins. Fundamental properties such as the total number of GCs, specific frequency, and color gradient in giant galaxies are not well- determined, largely because the GC systems can extend to many effective radii. Studies with smaller areal coverage observe only a small fraction of a galaxy's GC population and require large extrapolations to deduce the global GC system properties. Our proposed observations will allow us to study the GC systems of the targets to r ~ 100 kpc (~ 10-15 effective radii). Our study will significantly increase the number of early-type galaxies with measurements of global GC system properties and allow us to test theories of the formation and evolution of giant galaxies.


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



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