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The X-Ray Continuum Emission Region in the Lensed Quasar SDSS J133907.23+131038.6 is Much Smaller than the Accretion Disk
Christopher W. Morgan, James B. Margeson, Gilberto Garcia +4
We analyze microlensing variability in 15 seasons of optical monitoring data and 4 epochs of new X-ray observations of the doubly-imaged gravitationally lensed quasar SDSS J133907.…
NuSTAR Hard X-ray Monitoring of Gravitationally Lensed Quasar RX J1131-1231
Cora A. DeFrancesco, Xinyu Dai, Mark Mitchell +2
The X-ray emission from active galactic nuclei (AGN) is believed to come from a combination of inverse Compton scattering of photons from the accretion disk and reprocessing of the…
High frequency breaks in optical active galactic nuclei power spectral density
Heechan Yuk, Xinyu Dai
Context. Variability is a ubiquitous feature of active galactic nuclei (AGNs), and the characterisation of the variability is crucial to constrain its physical mechanism and proper…
The Changing Look Blazar B2 1420+32
Hora D. Mishra, Xinyu Dai, Ping Chen +22
Blazars are active galactic nuclei with their relativistic jets pointing toward the observer, with two major sub-classes, the flat spectrum radio quasars and BL Lac objects. We pre…
Constraining Quasar Relativistic Reflection Regions and Spins with Microlensing
Xinyu Dai, Shaun Steele, Eduardo Guerras +2
We present an analysis of Chandra spectra of five gravitationally lensed active galactic nuclei. We confirm the previous detections of FeK emission lines in most images of these…
Reconciling the Quasar Microlensing Disc Size Problem with a Wind Model of Active Galactic Nucleus
Ya-Ping Li, Feng Yuan, Xinyu Dai
Many analyses have concluded that the accretion disc sizes measured from the microlensing variability of quasars are larger than the expectations from the standard thin disc theory…