Twelve faint quasar candidates show soft X-ray flux changes by factors over 10 across 20 years of XMM-Newton data, extending extreme-variability quasar searches to r ~ 22.
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Highly Variable Quasar Candidates Selected from 4XMM-DR13 with Machine Learning
Twelve faint quasar candidates show soft X-ray flux changes by factors over 10 across 20 years of XMM-Newton data, extending extreme-variability quasar searches to r ~ 22.