tokens: This research was partially supported by the National Science Foundation under AST-1109288. G.G.K. acknowledges the support of the Australian Research Council through the award of a Future Fellowship (FT140100933). We thank the referee for useful suggestions. We thank Mark Seibert for the discussion on GALEX photometry. We gratefully acknowledge conversations with Peng Oh and Andrey Kravtsov, which contributed to shaping our interpretation of these data. Most of the data presented herein were obtained at the W.M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W.M. Keck Foundation. The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Mauna Kea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain. Some presented data are based on observations obtained with the Apache Point Observatory 3.5 m telescope, which is owned and operated by the Astrophysical Research Consortium. Facilities: Keck:I (LRIS) , Keck:II (NIRC2) , Gemini:Gillett (GMOS) , GALEX , ARC.
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