Computer Science
Scientific paper
Jul 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006hst..prop10788c&link_type=abstract
HST Proposal ID #10788. Cycle 15
Computer Science
Scientific paper
We plan to probe the central dark mass concentration in the collapsed-core globular cluster M15 by analyzing the structure of its central stellar cusp with the highest possible angular resolution. The rapid rise of M/L toward the center of M15 can be alternatively explained by a central concentration of several thousand compact remnants heavy white dwarfs and neutron stars or instead by the presence of an intermediate-mass black hole IMBH of a few thousand solar masses. We propose to obtain one orbit of ACS/HRC F555W V imaging to supplement the available ACS/HRC F435W B imaging from GO-10401. This will allow us 1 to improve the constraints on the radius of the as yet unresolved core and 2 to investigate the relation between cusp slope and stellar mass, the form of which depends on the size and mix of the remnant population and on whether or not an IMBH is present. We will compare the central cusp structure with predictions from both Fokker-Planck and GRAPE-6 N-body models, with and without IMBHs, to constrain the nature of the intriguing dark mass concentration.
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