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

Matthew J. Graham (), S. G. Djorgovski, Daniel Stern, Eilat Glikman, Andrew J. Drake, Ashish A. Mahabal, Ciro Donalek, Steve Larson and Eric Christensen
Additional contact information
Matthew J. Graham: California Institute of Technology, 1200 East California Boulevard
S. G. Djorgovski: California Institute of Technology, 1200 East California Boulevard
Daniel Stern: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, USA
Eilat Glikman: Middlebury College
Andrew J. Drake: California Institute of Technology, 1200 East California Boulevard
Ashish A. Mahabal: California Institute of Technology, 1200 East California Boulevard
Ciro Donalek: California Institute of Technology, 1200 East California Boulevard
Steve Larson: Lunar and Planetary Laboratory, University of Arizona, 1629 East University Boulevard
Eric Christensen: Lunar and Planetary Laboratory, University of Arizona, 1629 East University Boulevard

Nature, 2015, vol. 518, issue 7537, 74-76

Abstract: A search of a data set of light curves for 247,000 known, spectroscopically confirmed quasars with a temporal baseline of about 9 years reveals a strong, smooth periodic signal in the optical variability of quasar PG 1302−102 with a mean observed period of 1,884 ± 88 days, indicating a possible supermassive black-hole binary.

Date: 2015
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DOI: 10.1038/nature14143

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