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Article overview
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Young star clusters in interacting galaxies - NGC 1487 and NGC 4038/4039 | | Sabine Mengel
; Matthew D. Lehnert
; Niranjan A. Thatte
; William D. Vacca
; Brad Whitmore
; Rupali Chandar
; | | Date: |
16 May 2008 | | Abstract: | We estimate the dynamical masses of several young (~10 Myr) massive star
clusters in two interacting galaxies, NGC 4038/4039 ("The Antennae") and NGC
1487, under the assumption of virial equilibrium. These are compared with
photometric mass estimates from K-band photometry and assuming a standard
Kroupa IMF. The clusters were selected to have near-infrared colors dominated
by red supergiants, and hence to be old enough to have survived the earliest
phases of cluster evolution when the interstellar medium is rapidly swept out
from the cluster, supported by the fact that there is no obvious Halpha
emission associated with the clusters. All but one of the Antennae clusters
have dynamical and photometric mass estimates which are within a factor ~2 of
one another, implying both that standard IMFs provide a good approximation to
the IMF of these clusters, and that there is no significant extra-virial
motion, as would be expected if they were rapidly dispersing. These results
suggest that almost all of the Antennae clusters in our sample have survived
the gas removal phase as bound or marginally bound objects. Two of the three
NGC 1487 clusters studied here have M_dyn estimates which are significantly
larger than the photometric mass estimates. At least one of these two clusters,
and one in the Antennae, may be actively in the process of dissolving. The
process of dissolution contributes a component of non-virial motion to the
integrated velocity measurements, resulting in an estimated M_dyn which is too
high relative to the amount of measured stellar light. The dissolution
candidates in both galaxies are amongst the clusters with the lowest
pressures/densities measured in our sample. | | Source: | arXiv, 0805.2559 | | Services: | Forum | Review | PDF | Favorites | |
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