Other
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phdt........10b&link_type=abstract
Ph.D. Thesis Queens Univ., Kingston (Ontario).
Other
1
Galactic Evolution, Galaxies, Globular Clusters, Metallicity, Astronomical Photometry, Galactic Halos, Stellar Color
Scientific paper
We have investigated the dependence of globular cluster system (GCS) properties on parent galaxy type and environment. We have acquired deep B and V CCD photometry of the GCS's of NGC 1399, the Fornax cluster cD, and NGC 4594, a large-bulged spiral. We find that the clusters in NGC 1399 and NGC 4594 are bluer (more metal-poor) than the halo light, and we show that there is a radial color gradient in the NGC 1399 GCS. We confirm that NGC 1399 has a superabundant GCS, whereas NGC 4594 has a cluster specific frequency similar to other Sa/Sb galaxies. We also find a central deficit of clusters in NGC 4594, but it is not clear whether this was built in or was due to subsequent dynamical evolution. We have also obtained deep V CCD photometry of two poor cluster cDs, NGC 4073 (MKW 4) and NGC 5629 (AWN 3). NGC 4073 has a detectable GCS, but it is unlikely to be as cluster-rich as some rich cluster cD/gE galaxies (e.g. M87, NGC 1399). No GCS has been detected around NGC 5629. Some GCS properties, namely the mean cluster color (metallicity) and the degree of central concentration, depend on parent galaxy luminosity, whereas the cluster specific frequency depends on galaxy environment and to a lesser extent on galaxy type. On the other hand, the existence of cluster central deficits and color gradients does not seem to depend on galaxy attributes or environment. The finding of color gradients in some GCSs and not in others implies that cluster formation is dissipative in some cases and more prolonged and chaotic in others. It is argued that the available data are most consistent with globular clusters forming during protogalactic collapse, but slightly before the halo field populations.
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