Journal
ASTRONOMICAL JOURNAL
Volume 137, Issue 5, Pages 4361-4367Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-6256/137/5/4361
Keywords
galaxies: dwarf; galaxies: star clusters; globular clusters: general
Categories
Funding
- SNF [200020-113697, 200020-122140]
- RFBR [08-0200627]
- Swiss National Science Foundation (SNF) [200020-122140] Funding Source: Swiss National Science Foundation (SNF)
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We report the discovery from Hubble Space Telescope/ACS images of an extended globular cluster, denoted by Scl-dE1 GC1, in the Sculptor Group dwarf Elliptical galaxy Scl-dE1 (Sc22). The distance of the dE is determined as 4.3 +/- 0.25 Mpc from the I magnitude of the tip of the red giant branch in the color-magnitude diagram. At this distance the half-light radius of Scl-dE1 GC1 is similar to 22 pc, placing it among the largest clusters known, particularly for globular clusters associated with dwarf galaxies. The absolute magnitude of Scl-dE1 GC1 is M(V) = -6.7 and, to within the photometric uncertainties of the data, the cluster stellar population appears indistinguishable from that of the dE. We suggest that there may be two modes of globular cluster formation in dwarf galaxies, a normal mode with half-light radii of typically 3 pc, and an extended mode with half-light radii of similar to 10 pc or more.
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