NOAO >   Observing Info >   Approved Programs >   2009A-0135

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Proposal Information for 2009A-0135


PI: Terry Bridges, Anglo-Australian Observatory, tjb@aao.gov.au
Address: P.O. Box 296 (167 Vimiera Road), Epping, NSW 2121, Australia

CoI: Karl Gebhardt, University of Texas at Austin
CoI: Favio Faifer, Facultad de Cs. Astronomicas y Geofisicas, UNLP
CoI: Duncan Forbes, Swinburne University of Technology
CoI: Juan Forte, Facultad de Cs. Astronomicas y Geofisicas, UNLP
CoI: Dave Hanes, Queen's University
CoI: Mark Norris, University of North Carolina
CoI: Ray Sharples, University of Durham
CoI: Steve Zepf, Michigan State University

Title: Dynamical Modelling of the Dark Halo, Black Hole, and Orbital Structure in NGC4649

Abstract: NGC4649 is one of the best galaxies to compare dynamical models as derived from stars, globular clusters, planetary nebulae and X-ray gas. We propose to obtain kinematics of 150 globular clusters beyond a few effective radii. The datasets for NGC4649 are excellent for dynamical studies, with high spatial-resolution kinematics of the central regions and high signal-to-noise X-ray data. For galaxies like NGC4649, the black hole mass measure can be biased low about 2-3x when not including a dark halo in the models. There is also concern that the X-ray data may not adequately trace the gravitational potential. Thus, the proposed dataset will offer unique and important checks for determination of black hole mass, dark halo, X-ray properties, and orbital structure.


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