A survey of luminous high-redshift quasars with SDSS and WISE II. the bright end of the quasar luminosity function at z ~ 5

Abstract

This is the second paper in a series on a new luminous z ~ 5 quasar survey using optical and near-infrared colors. Here we present a new determination of the bright end of the quasar luminosity function (QLF) at z ~ 5. Combined our 45 new quasars with previously known quasars that satisfy our selections, we construct the largest uniform luminous z ~ 5 quasar sample to date, with 99 quasars in the range 4.7 <= z < 5.4 and -29 < M1450 <= -26.8, within the Sloan Digital Sky Survey (SDSS) footprint. We use a modified 1/Va method including flux limit correction to derive a binned QLF, and we model the parametric QLF using maximum likelihood estimation. With the faint-end slope of the QLF fixed as alpha = -2.03 from previous deeper samples, the best fit of our QLF gives a flatter bright end slope beta = -3.58+/-0.24 and a fainter break magnitude M*1450 = -26.98+/-0.23 than previous studies at similar redshift. Combined with previous work at lower and higher redshifts, our result is consistent with a luminosity evolution and density evolution (LEDE) model. Using the best fit QLF, the contribution of quasars to the ionizing background at z ~ 5 is found to be 18% - 45% with a clumping factor C of 2 - 5. Our sample suggests an evolution of radio loud fraction with optical luminosity but no obvious evolution with redshift.

arXiv comment14 pages, 12 figures, Accepted by ApJ

References in corpus (57)

• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• Composite Quasar Spectra From the Sloan Digital Sky Survey
• Spectroscopic Target Selection in the Sloan Digital Sky Survey: The Quasar Sample
• The Sloan Digital Sky Survey Quasar Catalog V. Seventh Data Release
• A Survey of z>5.8 Quasars in the Sloan Digital Sky Survey I: Discovery of Three New Quasars and the Spatial Density of Luminous Quasars at z~6
• The SDSS Quasar Survey: Quasar Luminosity Function from Data Release Three
• Observational constraints on Cosmic Reionization
• Radiative Transfer in a Clumpy Universe: III. The Nature of Cosmological Ionizing Sources
• The 2dF QSO Redshift Survey - XII. The spectroscopic catalogue and luminosity function
• The 2dF QSO Redshift Survey - I. The Optical QSO Luminosity Function
• An Empirical Ultraviolet Template for Iron Emission in Quasars as Derived from I Zw 1
• The Canada-France High-z Quasar Survey: nine new quasars and the luminosity function at redshift 6
• Model-independent evidence in favor of an end to reionization by z~6
• Optical and Radio Properties of Extragalactic Sources Observed by the FIRST and SDSS Surveys
• A Modified Magnitude System that Produces Well-Behaved Magnitudes, Colors, and Errors Even for Low Signal-to-Noise Ratio Measurements
• Evidence of patchy hydrogen reionization from an extreme Ly$\alpha$ trough below redshift six
• High-Redshift Quasars Found in Sloan Digital Sky Survey Commissioning Data IV: Luminosity Function from the Fall Equatorial Stripe Sampl
• The observed ionization rate of the intergalactic medium and the ionizing emissivity at z >5: Evidence for a photon starved and extended epoch of reionization
• The Difference between Radio-Loud and Radio-Quiet Active Galaxies
• On Black Hole Masses and Radio Loudness in AGN
• Spectral Classification of Quasars in the Sloan Digital Sky Survey: Eigenspectra; Redshift and Luminosity Effects
• The 2dF-SDSS LRG and QSO Survey: the QSO luminosity function at 0.4<z<2.6
• The Radio-Loud Fraction of Quasars is a Strong Function of Redshift and Optical Luminosity
• Simulation of Stellar Objects in SDSS Color Space
• Fe II Emission in 14 Low-Redshift Quasars: I - Observations
• The z=5 Quasar Luminosity Function from SDSS Stripe 82
• The Evolution of Lyman Limit Absorption Systems to Redshift Six
• The evolution of faint AGN between z~1 and z~5 from the COMBO-17 survey
• The 2dF-SDSS LRG and QSO Survey: The z<2.1 Quasar Luminosity Function from 5645 Quasars to g=21.85
• A Near-Infrared Spectral Template for Quasars
• The SDSS-III Baryon Oscillation Spectroscopic Survey: The Quasar Luminosity Function from Data Release Nine
• A Survey of z~6 Quasars in the SDSS Deep Stripe: I. a Flux-Limited Sample at z_{AB}<21
• On Lyman-limit Systems and the Evolution of the Intergalactic Ionizing Background
• High-Redshift Quasars Found in Sloan Digital Sky Survey Commissioning Data
• An X-shooter composite of bright 1 < z < 2 quasars from UV to infrared
• The VVDS type-1 AGN sample: The faint end of the luminosity function
• An improved method of constructing binned luminosity functions
• HST-COS Observations of AGN. II. Extended Survey of Ultraviolet Composite Spectra from 159 Active Galactic Nuclei
• Gas Clumping in Self-Consistent Reionisation Models
• Evolution of the Quasar Luminosity Function Over 3 < z < 5 in the COSMOS Survey Field
• Improved measurements of the intergalactic medium temperature around quasars: possible evidence for the initial stages of He-II reionisation at z~6
• Constraining the radio-loud fraction of quasars at z>5.5
• The Subaru high-z quasar survey: discovery of faint z~6 quasars
• A survey of luminous high-redshift quasars with SDSS and WISE. I. target selection and optical spectroscopy
• Radio Properties of z>4 Optically-Selected Quasars
• Constraints on the ionization sources of the high redshift intergalactic medium
• A comparison of the optical properties of radio-loud and radio-quiet quasars
• The 1<z<5 Infrared Luminosity Function of Type I Quasars
• The Radio Loud / Radio Quiet dichotomy: news from the 2dF QSO Redshift Survey
• GALEX far-UV color selection of UV-bright high-redshift quasars
• A Spectroscopic Survey of Faint Quasars in the SDSS Deep Stripe: I. Preliminary Results from the Co-added Catalog
• Mean and Extreme Radio Properties of Quasars and the Origin of Radio Emission
• A search for signatures of quasar evolution: Comparison of the shapes of the rest-frame optical/UV continua of quasars at z>3 and z~0.1
• The Faint End of the Quasar Luminosity Function at z~4
• Radio-Selected Quasars in the Sloan Digital Sky Survey
• ASERA: A Spectrum Eye Recognition Assistant for Quasar Spectra

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• Dark-ages reionization and galaxy formation simulation -- XVIII. The high-redshift evolution of black holes and their host galaxies
• The Infrared Medium-deep Survey. III. Survey of Luminous Quasars at 4.7 $\le$ z $\le$ 5.4
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• Chandra Detection of Three X-ray Bright Quasars at z>5
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• Reality or Mirage? Observational Test and Implications for the Claimed Extremely Magnified Quasar at $z=6.3$
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• When Spectral Modeling Meets Convolutional Networks: A Method for Discovering Reionization-era Lensed Quasars in Multi-band Imaging Data
• An Optically Faint Quasar Survey at z~5 in the CFHTLS Wide Field: Estimates of the Black Hole Masses and Eddington Ratios
• High-$z$ radio Quasars in RACS I: Selection, identification, and multi-wavelength properties
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• The Diversity of Metal-Enrichment and Abundance Patterns at High Redshift: A Magellan Survey of Gas-rich Galaxies Traced by Damped Lyman-alpha Absorbers at z~5
• Deep CFHT Y-band Imaging of VVDS-F22 Field: II. Quasar Selection and Quasar Luminosity Function
• The Qz5 Survey (I): How the HI Mass Density of the Universe Evolves With Cosmic Time
• The PAU Survey: The quasar UV and Ly$\alpha$ luminosity functions at $2.7<z<5.3$
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• Discovery of two quasars at $z=5$ from the OGLE Survey
• Accelerating lensed quasar discovery and modeling with physics-informed variational autoencoders
• Extreme Galaxy-scale Outflows Are Frequent among Luminous Early Quasars
• Lensing in the Darkness: A Bayesian Analysis of 22 Chandra Sources at $z\gtrsim 6$ Shows No Evidence of Lensing
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