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We report the discovery from Hubble Space Telescope ACS images of an extendedglobular cluster, denoted by Scl-dE1 GC1, in the Sculptor Group dwarfElliptical 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 thecolor-magnitude diagram. At this distance the half-light radius of Scl-dE1 GC1is ~22 pc, placing it among the largest clusters known, particularly forglobular clusters associated with dwarf galaxies. The absolute magnitude ofScl-dE1 GC1 is Mv = -6.7 and, to within the photometric uncertainties of thedata, the cluster stellar population appears indistinguishable from that of thedE. We suggest that there may be two modes of globular cluster formation indwarf galaxies, a "normal" mode with half-light radii of typically 3 pc, and an"extended" mode with half-light radii of ~10 pc or more.

Scl-dE1 GC1: An Extended Globular Cluster in a Low-Luminosity Dwarf Elliptical Galaxy