The 2dF QSO Redshift Survey - I. The Optical QSO Luminosity Function

Abstract

We present a determination of the optical QSO luminosity function and its cosmological evolution with redshift for a sample of over 6000 QSOs identified primarily from the first observations of the 2dF QSO Redshift Survey (2QZ). For QSOs with -26 < M_B < -23 and 0.35 < z < 2.3, we find that pure luminosity evolution (PLE) models provide an acceptable fit to the observed redshift dependence of the luminosity function. The luminosity function is best fit by a two-power-law function of the form. Exponential luminosity evolution models, both as a function of look-back time, and as a general second-order polynomial with redshift, were found to provide acceptable fits to the dataset comprising the 2QZ and the Large Bright Quasar Survey. Exponential evolution with look-back time is prefered for q_0=0.05, while the polynomial evolution model is prefered for q_0=0.5. The shape and evolution of the LF at low redshifts (z<0.5) and/or high luminosities, not currently well sampled by the 2dF QSO survey, may show departures from pure luminosity evolution, but the results presented here show that over a significant range of redshift, PLE is a good description of QSO evolution.

Accepted for publication in MNRAS. 10 pages, 7 figures

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• The Intrinsic Quasar Luminosity Function: Accounting for Accretion Disk Anisotropy
• Constraints on the X-ray Luminosity Function of AGN at z=5.7-6.4 with the Extragalactic Serendipitous Swift Survey
• Outflow and metallicity in the broad-line region of low-redshift active galactic nuclei
• Constraining Torus Models for AGNs Using X-Ray Observations
• On the Evolution of High-Redshift Active Galactic Nuclei
• Do all QSOs have the same black hole mass?
• The black hole mass versus velocity dispersion relation in QSOs/Active Galactic Nuclei: observational appearance and black hole growth
• The Infrared Counterparts of the Optically Unidentified CDF-S 1Ms Sources
• Constraining the Cosmological Density of Compact Objects with the Long-Term Variability of Quasars
• Optical Selection of Faint AGN in the COSMOS Field
• Spatial Correlations in the Helium-Ionizing Background
• Cosmological Growth History of Supermassive Black Holes and Demographics in the High-z Universe : Do Lyman-Break Galaxies Have Supermassive Black Holes?
• Quasars as Standard Candles V. Evaluation of a $\le$ 0.06 dex intrinsic dispersion in the LX-LUV relation
• Astrometry Survey Missions Beyond the Magnitude Limit
• The radio luminosity, black hole mass and Eddington ratio for quasars from the Sloan Digital Sky Survey
• The Active Galactic Nuclei in the Hobby-Eberly Telescope Dark Energy Experiment Survey (HETDEX) II. Luminosity Function
• A multi-wavelength continuum characterization of high-redshift broad absorption line quasars
• Rapidly spinning massive black holes in active galactic nuclei: evidence from the black hole mass function
• Lifting cosmic degeneracy within a single quasar survey
• Euclid preparation. Observational expectations for redshift z<7 active galactic nuclei in the Euclid Wide and Deep surveys
• Constraints on the warm dark matter model from gravitational lensing
• Multi-epoch intra-night optical monitoring of 8 radio-quiet BL Lac candidates
• A left and right truncated Schechter luminosity function for quasars
• Strong Lensing by Subhalos in the Dwarf-Galaxy Mass Range II: Detection Probabilities
• First tentative detection of anisotropy in the QSO distribution around nearby edge-on spiral galaxies
• How many active galaxies and QSOs will future Space Missions detect?
• The 2005 July Superoutburst of the Dwarf Nova 2QZ J021927.9-304545: the SU UMa Nature Confirmed
• Effect of spectral index distribution on estimating the AGN radio luminosity function
• Deep CFHT Y-band Imaging of VVDS-F22 Field: II. Quasar Selection and Quasar Luminosity Function
• A survey for low luminosity quasars at redshift z~5
• Modeling the accretion history of supermassive black holes
• Rest-frame optical continua of L ~ L*, z>3 quasars: probing the faint end of the high z quasar luminosity function
• Detecting quasars at very high redshift with next generation X-ray telescopes
• The optical luminosity function of LOFAR radio-selected quasars at $1.4\le z\le 5.0$ in the NDWFS-Boötes field
• Can Geometric Test Probe the Cosmic Equation of State ?
• Cosmological Evolution Models for QSO/AGN Luminosity Functions: Effects of Spectrum-Luminosity Correlation and Massive Black Hole Remnants
• Using microlensed quasars to probe the structure of the Milky Way
• Evidence of under-developed torus and broad-line region of weak emission line quasars based on their spectral energy distribution
• Revealing the Warm and Hot Halo Baryons via Thomson Scattering of Quasar Light
• The PAU Survey: The quasar UV and Ly$\alpha$ luminosity functions at $2.7<z<5.3$
• An Extremely Bright QSO at $z=2.89$
• Field Target Allocation and Routing Algorithms for Starbugs
• Discovery of six high-redshift quasars with the Lijiang 2.4m telescope and the Multiple Mirror Telescope
• Lensing by Lyman Limit Systems: Determining the Mass to Gas Ratio
• Discovering bright quasars at intermediate redshifts based on the optical/near-IR colors
• Counting quasar--radio source pairs to derive the millijansky radio luminosity function and clustering strength to z=3.5
• The Large Sky Area Multi-object Fiber Spectroscopic Telescope (LAMOST) Quasar Survey: Quasar Properties from Data Release 10 to 12
• X-ray luminosity functions of different morphological and X-ray type AGN populations
• Discovery of a New Blue Quasar: SDSS J022218.03-062511.1
• Discovery of a New Quasar: SDSS J022155.26-064916.6
• Bayesian luminosity function estimation in multi-depth datasets with selection effects: A case study for $3<z<5$ Lyman $\alpha$ emitters
• SRG/eROSITA-SDSS view on the relation between X-ray and UV emission for quasars