Jian‐Min Wang

Mrk 382: A Narrow-line Seyfert 1 Galaxy with Recurrent X-Ray State Transitions

Abstract We report recurrent X-ray state transitions in the nearby narrow-line Seyfert 1 galaxy Mrk 382 using multiepoch observations from Swift, Chandra, XMM-Newton, and eROSITA, together with archival ultraviolet (UV), optical, and infrared (IR) data. The 0.3–2 keV flux varies...

On the Probability Distribution and Null-hypothesis Testing of Cross Correlation for Light Curves in Active Galactic Nuclei

Abstract Cross correlation is crucial in studies of multiwavelength flux variability in active galactic nuclei (AGNs), especially for reverberation mapping analysis, where an interpolated cross-correlation function is widely used to measure time lags between light curves. While t...