PHL 1811 Analogs: A Population of X-ray Weak Quasars
  We report on a population of X-ray weak quasars with similar UV emission-line properties to those of the remarkable quasar PHL 1811. All radio-quiet PHL 1811 analogs are notably X-ray weak by a mean factor of ~13, with hints of heavy X-ray absorption. Correlations between the X-ray weakness and UV emission-line properties suggest that PHL 1811 analogs may have extreme wind-dominated broad emission-line regions (BELRs). We propose an AGN geometry that can potentially unify the PHL 1811 analogs and the general population of weak-line quasars. 
Jianfeng Wu, W. N. Brandt, Patrick B. Hall, Robert R. Gibson, Gordon   T. Richards, Donald P. Schneider, Ohad Shemmer, Denni...
astro-ph.CO astro-ph.GA astro-ph.HE