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A possible close supermassive black-hole binary in a quasar with optical periodicity

M. J. GrahamCalifornia Institute of Technology, 1200 East California Boulevard, Pasadena, California 91125, USAS. G. DjorgovskiCalifornia Institute of Technology, 1200 East California Boulevard, Pasadena, California 91125, USADaniel SternJet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, USAEilat GlikmanDepartment of Physics, Middlebury College, Middlebury, Vermont 05753, USAA. J. DrakeCalifornia Institute of Technology, 1200 East California Boulevard, Pasadena, California 91125, USAAshish A MahabalCalifornia Institute of Technology, 1200 East California Boulevard, Pasadena, California 91125, USAC. DonalekCalifornia Institute of Technology, 1200 East California Boulevard, Pasadena, California 91125, USASteve LarsonLunar and Planetary Laboratory, Department of Planetary Sciences, University of Arizona, 1629 East University Boulevard, Tucson, Arizona 85721, USAE. ChristensenLunar and Planetary Laboratory, Department of Planetary Sciences, University of Arizona, 1629 East University Boulevard, Tucson, Arizona 85721, USA
2015en
ABI

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