QSO Optical LF

Challenges to ‘Simple’ Picture

• Not PLE - bright-end slope changes with z

  Hewett et al. 93,
  
  La Franca & Cristiani 97

• No break in LF at low z

  Koehler et al. 97
  

• Weak or absent break at higher redshifts

  Hawkins & Veron 95
  

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