3 papers
astro-ph.GA2025
Quasi-periodic oscillations in optical color evolutions to support sub-pc binary black hole systems in broad line active galactic nuclei
Zhang XueGuang
Optical quasi-periodic oscillations (QPOs) with periodicity around hundreds to thousands of days have been accepted as an efficient indicator for sub-pc binary black hole systems (…
astro-ph.GA2025
Effects of intrinsic AGN variability on optical QPOs related to sub-pc binary black hole systems in broad line AGN
Zhang XueGuang
In this manuscript, an oversimplified model is proposed to test the effects of intrinsic AGN variability on expected optical quasi-periodic oscillations (QPOs) related to sub-pc bi…
astro-ph.GA2024
Optical QPOs with 550 day periodicity in the reverberation mapped broad line quasar PG 1411+442
XueGuang Zhang
In this manuscript, optical quasi-periodic oscillations (QPOs) with 550 day periodicity related to a candidate of sub-pc binary black hole (BBH) system are reported in the reverber…