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astro-ph.GA2026
X-ray variability of SDSS J000532.84+200717.4: from a normal state to an X-weak state
Xiaohui Yang, Yanli Ai, Liming Dou +8
We present a multi-epoch study of the extreme X-ray variability of the type~1 quasar SDSS~J000532.84+200717.4 using archival observations from \textit{XMM-Newton}, \textit{Swift}/X…
astro-ph.GA2025
Finding Quasars behind the Galactic Plane. IV. Candidate Selection from Chandra with Random Forest
Xu Zhang, Yanli Ai, Yanxia Zhang +8
Quasar samples remain severely incomplete at low Galactic latitudes because of strong extinction and source confusion. We conduct a systematic search for quasars behind the Galacti…
astro-ph.GA2025
Highly Variable Quasar Candidates Selected from 4XMM-DR13 with Machine Learning
Heng Wang, Yanli Ai, Yanxia Zhang +6
We present a sample of 12 quasar candidates with highly variable soft X-ray emission from the 4th XMM-newton Serendipitous Source Catalog (4XMM-DR13) using random forest. We obtain…