Mathematics
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phdt.........1w&link_type=abstract
PhD Thesis, Combined Faculties for the Natural Sciences and for Mathematics of the University of Heidelberg, Germany. 100 pp. (2
Mathematics
Spiral Galaxy, Nucleus, Stellar Population, Bulgeless, Star Cluster
Scientific paper
I present a study of the central region of very late type (bulge-less) galaxies, as a contribution to a full census of the nuclear properties of galaxies. The exceptionally bright (106 - 108 Lsolar) but compact (re ~ 5 pc) nuclear star clusters found by Böker et al. (2002) have been studied using spectra taken with UVES at the VLT. I measure the velocity dispersions of nine clusters and use these to determine masses between 8×105 and 6×107 Msolar. The same spectra together with a population synthesis model yield mean luminosity weighted ages, which range between 3×106 and 3×109 years. The mean metallicities are 2/5 the solar value. It is also shown that the clusters are composed of several stellar populations with different ages. It follows from their dynamical properties that, rather than small bulges, the closest structural kin of nuclear clusters are massive compact star clusters. Nuclear clusters are among the objects with the highest mean mass density inside the effective radius. Nuclear clusters are also exceptional in that they experience repeated episodes of star formation. The unusual properties of this type of clusters probably are a consequence of their location in the centers of their respective host galaxies. No relation could be found between the large scale properties of the host galaxy and those of the cluster.
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