“School of Astronomy”
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| Paper IPM / Astronomy / 18072 |
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We examine a new scenario to model the outer halo globular cluster (GC) Pal 14 over its lifetime by perform-
ing a comprehensive set of direct N-body calculations. We assume Pal 14 was born in a now detached/disrupted
dwarf galaxy with a strong tidal field. Pal 14 evolved there until the slope of the stellar mass function (MF)
became close to the measured value which is observed to be significantly shallower than in most GCs. After
about 2-3 Gyr, Pal 14 was then captured by the Milky Way (MW). Although the physical size of such a cluster
is indistinguishable from a cluster that has lived its entire life in the MW, other parameters like its mass and the
MF-slope, strongly depend on the time the cluster is taken from the dwarf galaxy. After being captured by the
MW on a new orbit, the cluster expands and eventually reaches the appropriate mass and size of Pal 14 after
11.5 Gyr while reproducing the observed MF. These simulations thus suggest that Pal 14 may have formed in a
dwarf galaxy with a post-gas-expulsion initial half-mass radius and mass of rh = 7 pc and 8 < M/104 < 10
Mâ, respectively, with a high degree of primordial mass segregation
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