Paper:	The Luminosity Function of High-redshift QSOs
Volume:	380, At the Edge of the Universe: Latest Results from the Deepest Astronomical Surveys
Page:	131
Authors:	Fontanot, F.; Cristiani, S.; Monaco, P.; Vanzella, E.; Nonino, M.; Brandt, W.N.; Grazian, A.; Mao, J.
Abstract:	We measure the luminosity function of QSOs in the redshift range 3.5 < z < 5.2, covering the absolute magnitude range −21 < M145 < −28. Suit- able criteria are defined to select faint QSOs in the GOODS fields, checking their effectiveness and completeness in detail. The confirmed sample of faint QSOs is compared with a brighter one derived from the SDSS. Our results show that models based on pure density evolution are in better agreement with observations than those based on pure luminosity evolution. Our data are consistent with a steeper faint-end slope compared with the lower redshifts samples. Moreover, models with relatively steeper bright-end slope agree better with observations. Determining the faint-end slope of the luminosity function at this redshift range provides important constraints on models of the joint evolution of galaxies and AGNs.

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