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The Globular Cluster Systems of the Sculptor Group

  • Knut Olsen (a1), Bryan Miller (a2), Robert Schommer (a3), Nick Suntzeff (a1) and John Bright (a4)...

Abstract

We present results from a study to identify the globular cluster systems of six of the brightest galaxies of the Sculptor Group. From Mosaic II CMR images of the area surrounding the galaxies NGC 45, NGC 55, NGC 247, NGC 253, NGC 300, and NGC 7793, we identify cluster candidates through their morphology, luminosity, and color. We show that many of the Milky Way's globular clusters would appear extended in our images if placed in the Sculptor Group; only in the two most distant galaxies, NGC 45 and NGC 7793, is the discrimination difficult. We find 50–100 candidates per galaxy with integrated properties similar to Milky Way clusters. Published spectroscopic identifications of candidates in NGC 253 lead us to expect that ∼50% of the candidates are true clusters, while the remainder are background galaxies. Study of the Sculptor Group galaxies increases the sample of late-type spiral and Magellanic-type galaxies with known globular cluster systems from 2 to ∼10.

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References

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