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


Quasars have long been known to be variable sources at all wavelengths. Their optical variability is stochastic and can be due to a variety of physical mechanisms; it is also well-described statistically in terms of a damped random walk model. The recent availability of large collections of astronomical time series of flux measurements (light curves) offers… (More)
DOI: 10.1038/nature14143


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