tokens: We thank the anonymous referee for their careful reading and constructive comments that improved the presentation of our work. This research has made use of the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration and the VizieR catalog access tool, CDS, Strasbourg, France. D.C.L. acknowledges support from NSF grants AST-1009571 and AST-1210311, under which part of this research was carried out. This research was also supported by NSF grants AST-1210599 (UA) and AST-1210372 (U. Denver). Some observations reported here were obtained at the MMT Observatory, a joint facility of the University of Arizona and the Smithsonian Institution.
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