3 papers
astro-ph.GA2024
Could the inter-band lag of active galactic nucleus vary randomly?
Zhen-Bo Su, Zhen-Yi Cai, Jun-Xian Wang +18
The inter-band lags among the optical broad-band continua of active galactic nuclei (AGNs) have been intensively explored over the past decade. However, the nature of the lags rema…
astro-ph.GA2023
Extreme Variability Quasars in Their Various States. II: Spectral Variation Revealed with Multi-epoch Spectra
Wenke Ren, Junxian Wang, Zhenyi Cai +1
We previously built a sample of 14,012 extremely variable quasars (EVQs) based on SDSS and Pan-STARRS1 photometric observations. In this work we present the spectral fitting to the…
astro-ph.GA2023
How can the optical variation properties of active galactic nuclei be unbiasedly measured?
Xu-Fan Hu, Zhen-Yi Cai, Jun-Xian Wang
The variability of active galactic nuclei (AGNs) is ubiquitous but has not yet been understood. Measuring the optical variation properties of AGNs, such as variation timescale and…