NOAO >   Observing Info >   Approved Programs >   2005B-0111

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Proposal Information for 2005B-0111


PI: Carl J. Grillmair, Spitzer Science Center, carl@ipac.caltech.edu
Address: 1200 E. California Blvd., Pasadena, CA 91125, U.S.A.

CoI: Odysseas Dionatos, Spitzer Science Center
CoI: John Bahcall, Institute for Advanced Study
CoI: Roc Cutri, Infrared Processing and Analysis Center
CoI: Douglas Geisler, University of Concepcion
CoI: Wolfgang Gieren, University of Concepcion
CoI: Eva Grebel, University of Basil
CoI: Kathryn Johnston, Wesleyan University
CoI: Steven Majewski, University of Virginia
CoI: Richard Patterson, University of Virginia
CoI: Neill Reid, Space Telescope Science Institute
CoI: David Spergel, Princeton University
CoI: Scott Tremaine, Princeton University

Title: Mapping Globular Cluster Tidal Streams

Abstract: The primary scientific goal of this program is to detect and map the tidal streams emanating from halo globular clusters. We propose to obtain moderately deep V and I imaging of the regions within 2\deg of the centers of five globular clusters with R_sun < 50 kpc and with a high probability of having strong tidal tails. Given that these cold tidal streams are on essentially the same orbits as their parent clusters, they can be used to constrain both the formation and evolution of the Galactic halo as well as the present shape of the Galactic potential field. With follow-up spectroscopy to eliminate foreground contaminants, the stars in these tidal streams will be used to construct a high-priority target list for the Space Interferometry Mission (SIM). Proper motion measurements of these stars with SIM will enable us to tightly constrain the detailed, three-dimensional structure of the Galactic potential field from the Solar Circle out to 50 kpc.


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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