Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...459..769v&link_type=abstract
Astronomy and Astrophysics, Volume 459, Issue 3, December I 2006, pp.769-775
Astronomy and Astrophysics
Astrophysics
5
Galaxies: Dwarf, Galaxies: Individual: Ngc 5253, Galaxies: Individual: He 2-10, Galaxies: Star Clusters
Scientific paper
We present new high-resolution optical spectroscopy of giant HII regions around three young
massive clusters located in the blue dwarf galaxies NGC 5253 and He 2-10.
We used the observations to derive the mass of the clusters under the hypothesis of virialization. The virial masses exceed the optical ones. In one case, however, the virial mass is consistent with that derived from the IR luminosity, pointing to the presence of a hidden stellar population.
The dynamics inferred from the emission lines indicates that the clusters may indeed be
virialized or close to virialization.
We
detect an indication of mass segregation in two clusters. At least in one case, we find that such
mass segregation must have a "primordial" nature, rather than dynamical,
i.e. associated with the formation mechanism of the cluster. We could resolve two of
the clusters with the spectro-astrometric technique detecting in both cases
evidence of structures on the pc scale.
Maiolino Roberto
Scatarzi A.
Sterzik Michael
Vanzi Leonardo
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