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- W2023894557 abstract "We searched for quasars that are ~ 3 mag fainter than the SDSS quasars in the redshift range 3.7 < z < 4.7 in the COSMOS field to constrain the faint end of the quasar luminosity function. Using optical photometric data, we selected 31 quasar candidates with 22 < i' < 24 at z ~ 4. We obtained optical spectra for most of these candidates using FOCAS on the Subaru telescope, and identified 8 low-luminosity quasars at z ~ 4. In order to derive the quasar luminosity function (QLF) based on our spectroscopic follow-up campaign, we estimated the photometric completeness of our quasar survey through detailed Monte Carlo simulations. Our QLF at z ~ 4 has a much shallower faint-end slope beta = -1.67^{+0.11}_{-0.17} than that obtained by other recent surveys in the same redshift. Our result is consistent with the scenario of downsizing evolution of active galactic nuclei inferred by recent optical and X-ray quasar surveys at lower redshifts." @default.
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- W2023894557 date "2011-01-25" @default.
- W2023894557 modified "2023-10-01" @default.
- W2023894557 title "PROBING THE FAINT END OF THE QUASAR LUMINOSITY FUNCTION AT <i>z</i> ∼ 4 IN THE COSMOS FIELD" @default.
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- W2023894557 doi "https://doi.org/10.1088/2041-8205/728/2/l25" @default.
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