PI: Knut Olsen, NOAO, firstname.lastname@example.org
Address: PO Box 26732, 950 North Cherry Avenue, Tucson, AZ 85726-6732, USA
Title: Observing an Ongoing Minor Merger in NGC 5128
Abstract: I propose to use GSAOI+GeMS on Gemini South to observe what has been demonstrated to be a dwarf galaxy currently being accreted by the nearby massive elliptical galaxy NGC 5128. The sharp images and excellent Strehl ratios delivered by GeMS will allow for measurement of individual stars in the accreting dwarf and in the halo of NGC 5128, as well as the clear identification of the star cluster population of the dwarf. Photometry of the individual stars will be deep enough to discern the coarse star formation histories of the arc and the halo, and to derive integrated colors and profiles of the star clusters. NGC 5128 is the only massive elliptical that is nearby enough to allow for detailed observations of its merger history. The proposed observations will allow study of the consequences of minor mergers on the populations of the outer regions of massive elliptical galaxies.
National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360