The dynamical M/L-profile and distance of the globular cluster M15

Details The dynamical M/L-profile and distance of the globular cluster M15 The dynamical M/L-profile and distance of the globular cluster M15

2005-12-20

arxiv.org/abs/astro-ph/0512503v2

Astrophys.J.641:852-861,2006

Astronomy and Astrophysics

Astrophysics

10 pages, 10 figures, 4 tables, emulateapj, Accepted for publication in ApJ, v2: fixed layout

Scientific paper

10.1086/500644

We construct orbit-based axisymmetric dynamical models for the globular cluster M15 which fit groundbased line-of-sight velocities and Hubble Space Telescope line-of-sight velocities and proper motions. This allows us to constrain the variation of the mass-to-light ratio M/L as a function of radius in the cluster, and to measure the distance and inclination of the cluster. We obtain a best-fitting inclination of 60+/-15 degrees, a dynamical distance of 10.3+/-0.4 kpc and an M/L profile with a central peak. The inferred mass in the central 0.05 parsec is 3400 Msun, implying a central density of at least 7.4x10^6 Msun pc^-3. We cannot distinguish the nature of the central mass concentration. It could be an IMBH or it could be large number of compact objects, or it could be a combination. The central 4 arcsec of M15 appears to contain a rapidly spinning core, and we speculate on its origin.

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