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Understanding extreme quasar optical variability with CRTS: II. Changing-state quasars
Matthew J. Graham, Nicholas P. Ross, Daniel Stern +8
We present the results of a systematic search for quasars in the Catalina Real-time Transient Survey exhibiting both strong photometric and spectroscopic variability over a decadal…
Results of a systematic search for outburst events in 1.4 million galaxies
A. J. Drake, S. G. Djorgovski, M. J. Graham +5
We present an analysis of nine years of Catalina Surveys optical photometry for 1.4 million spectroscopically confirmed SDSS galaxies. We find 717 outburst events that were not rep…
Understanding extreme quasar optical variability with CRTS: I. Major AGN flares
Matthew J. Graham, S. G. Djorgovski, Andrew J. Drake +5
There is a large degree of variety in the optical variability of quasars and it is unclear whether this is all attributable to a single (set of) physical mechanism(s). We present t…
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…
Evidence for a Milky Way Tidal Stream Reaching Beyond 100 kpc
A. J. Drake, M. Catelan, S. G. Djorgovski +9
We present the analysis of 1,207 RR Lyrae found in photometry taken by the Catalina Survey's Mount Lemmon telescope. By combining accurate distances for these stars with measuremen…