NOAO >   Observing Info >   Approved Programs >   2003B-0287

Small NOAO Logo

Proposal Information for 2003B-0287


PI: Joris Gerssen, Space Telescope Science Institute, gerssen@stsci.edu
Address: 3700 San Martin Drive, Baltimore, MD 21218, USA

CoI: Karl Gebhardt, University of Texas at Austin
CoI: Roeland van der Marel, Space Telescope Science Institute
CoI: Jeremy Allington-Smith, University of Durham, UK

Title: Stellar Kinematics in the Center of M3

Abstract: The high central stellar densities in globular clusters provide a unique environment to study the fundamental dynamical process of two- body relaxation. This process is the main driver of the dynamical evolution in the center of a globular cluster and has a profound effect on the structure of the globular cluster and on its stellar environment. We propose to constrain the most fundamental central parameter, the mass density, in the globular cluster M3 by measuring the radial velocities of stars close to its center using GMOS in the IFU mode. The central stellar density of M3 is well matched to the spatial resolution of this instrument. Moreover, we already have a set of 400 stellar velocities that cover the large scale kinematics in this cluster. Taken together, this will allows us to construct a dynamical model of this cluster and derive tight constraints on the central mass density. The data will also allow us to better understand the central rotation. This phenomenon is neither explained nor is it predicted by any globular cluster model.


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 >   2003B-0287

noaoprop-help@noao.edu

Small NOAO Logo