S19A0136abst
S19A0136
Cosmological evolution of the AGN luminosity function (LF) at z>3 is a fundamental observable to statistically unveil the accretion growth history of Super Massive Black Holes (SMBHs) in the early universe. Furthermore, constraints on the faint-end slope of the LF are also important to evaluate contribution of AGNs to the UV ionizing background in the reionization era. The wide and deep imaging data from the HSC SSP program provide us a unique opportunity to determine the shape of the QSO LF in the early universe with unprecedented accuracy. The newly derived QSO LF at z=4 shows stronger break and flatter slope in the faint end than the LFs in the other studies, suggesting much smaller contribution to the ionizing photon budget. However, the new LF relies on the morphology+photometric selection of z=4 quasars, and we would like to evaluate the selection completeness, contamination rate, redshift distribution with the proposed spectroscopic follow-up of primary and potential candidates of z=4 quasars. Once we establish the method to derive the QSO LF from the HSC photometric dataset, we can extend the study to lower (z=3) and higher (z=5) redshifts to disclose the discussion on the redshift evolution of the QSO LF in the early universe.
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