Computer Science
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9436k&link_type=abstract
HST Proposal ID #9436
Computer Science
Hst Proposal Id #9436
Scientific paper
We propose to measure proper motions in a bulge field at l, b=0,-6, near the globular cluster NGC 6558. Suitable first- epoch data exist {from 1997}. These data will allow us to calculate the vertical potential gradient in the bulge region, and hence the flattening of the potential in the central regions of the potential - a crucial piece of information for deciding measuring the central density of the dark halo of the Galaxy. Central halo densities currently constitute one of the most discrepant predictions of structure formation theories. In addition, the proper motions will allow us to make a kinematic separation between bulge, disk and globular cluster stars. The resulting cleaned colour-magnitude diagrams allow the bulge main sequence turnoff to be viewed cleanly, and compared with lower-latitude regions. Thus age and metallicity gradients in the bulge can be measured.
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