Questing a Coherent Definition of Weak-line Quasars and its Physical Implications

Xiaoqiang Cheng, Jianfeng Wu, Qiaoya Wu

Weak-line quasars (WLQs) are a subset of type 1 quasars with remarkably weak high-ionization broad emission lines but normal optical/UV continua. Using 371,091 quasars from SDSS DR…