Ultraluminous high-redshift quasars from SkyMapper - II. New quasars and the bright end of the luminosity function

Christopher A. Onken*, Christian Wolf*, Fuyan Bian, Xiaohui Fan, Wei Jeat Hon, David Raithel, Patrick Tisserand, Samuel Lai

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    13 Citations (Scopus)

    Abstract

    We search for ultraluminous Quasi-Stellar Objects (QSOs) at high redshift using photometry from the SkyMapper Southern Survey Data Release 3 (DR3), in combination with 2MASS, VHS DR6, VIKING DR5, AllWISE, and CatWISE2020, as well as parallaxes and proper motions from Gaia DR2 and eDR3. We report 142 newly discovered Southern QSOs at 3.8 < z < 5.5, of which 126 have M145 < -27 AB mag and are found in a search area of 14 486 deg2. This Southern sample, utilizing the Gaia astrometry to offset wider photometric colour criteria, achieves unprecedented completeness for an ultraluminous QSO search at high redshift. In combination with already known QSOs, we construct a sample that is >80 per cent complete for M145 < -27.33 AB mag at z = 4.7 and for M145 < -27.73 AB mag at z = 5.4. We derive the bright end of the QSO luminosity function at rest frame 145 nm for z = 4.7-5.4 and measure its slope to be β = -3.60 ± 0.37 and β = -3.38 ± 0.32 for two different estimates of the faint-end QSO density adopted from the literature. We also present the first z ∼5 QSO luminosity function at rest frame 300 nm.

    Original languageEnglish
    Pages (from-to)572-594
    Number of pages23
    JournalMonthly Notices of the Royal Astronomical Society
    Volume511
    Issue number1
    DOIs
    Publication statusPublished - 1 Mar 2022

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