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

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

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009noao.prop..135b&link_type=abstract

NOAO Proposal ID #2009A-0135

Computer Science

Scientific paper

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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