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28 March 2024
 
  » arxiv » astro-ph/0401619

 Article overview


The Globular Cluster Systems of the Sculptor Group
K.A.G. Olsen ; B.W. Miller ; N.B. Suntzeff ; R.A. Schommer ; J. Bright ;
Date 29 Dec 2003
Subject astro-ph
Affiliation1,3), and J. Bright ( Cerro Tololo Inter-American Observatory, Gemini Observatory, Deceased 2001 December 12, Harvard-Smithsonian Center for Astrophysics
AbstractWe use CTIO 4-m Mosaic II images taken with the Washington $CM$ and Harris $R$ filters to identify candidate globular clusters in the six major galaxies of the Sculptor group: NGC 45, NGC 55, NGC 247, NGC 254, NGC 300, and NGC 7793. From follow-up spectroscopy with Hydra-CTIO, we find 19 new globular clusters in NGC 55, NGC 247, NGC 253, and NGC 300, bringing the total number of known Sculptor group globular clusters to 36. The newly discovered clusters have spectroscopic ages consistent with those of old Milky Way globular clusters, and the majority are metal-poor. Their luminosity function closely resembles that of the Milky Way’s globular clusters; their metallicity distribution is somewhat more metal-rich, but this may be the result of our color selection of candidates. The mean [$alpha$/Fe] ratio in the clusters is $-0.2pm0.3$, which is lower than the Milky Way average. The specific frequencies $S_N$ are similar to those of other late-type galaxies. However, if we calculate the specific frequency using the $K$-band total magnitudes of the host galaxies, we find values that are more than a factor of two higher. The kinematics of the globular cluster systems are consistent with rotation with the ion{H}{1} disk in each of the four galaxies; however, only in NGC 253 is this result based on more than seven objects. We suggest that the Sculptor group galaxies add to evidence indicating that many of the first generation globular clusters formed in disks, not halos.
Source arXiv, astro-ph/0401619
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