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Infrared Time Lags for the Periodic Quasar PG 1302-102
Hyunsung D. Jun, Daniel Stern, Matthew J. Graham +5
The optical light curve of the quasar PG 1302-102 at shows a strong, smooth 5.2 yr periodic signal, detectable over a period of yr. Although the interpretatio…
A systematic search for close supermassive black hole binaries in the Catalina Real-Time Transient Survey
Matthew J. Graham, S. G. Djorgovski, Daniel Stern +6
Hierarchical assembly models predict a population of supermassive black hole (SMBH) binaries. These are not resolvable by direct imaging but may be detectable via periodic variabil…
A possible close supermassive black-hole binary in a quasar with optical periodicity
Matthew J. Graham, S. George Djorgovski, Daniel Stern +6
Quasars have long been known to be variable sources at all wavelengths. Their optical variability is stochastic, can be due to a variety of physical mechanisms, and is well-describ…