The Extremely Luminous Quasar Survey in the Sloan Digital Sky Survey Footprint. III. The South Galactic Cap Sample and the Quasar Luminosity Function at Cosmic Noon - Archive ouverte HAL Access content directly
Journal Articles The Astrophysical Journal Year : 2019

The Extremely Luminous Quasar Survey in the Sloan Digital Sky Survey Footprint. III. The South Galactic Cap Sample and the Quasar Luminosity Function at Cosmic Noon

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Jan-Torge Schindler
  • Function : Author
Xiaohui Fan
  • Function : Author
Ian D. Mcgreer
  • Function : Author
Jinyi Yang
  • Function : Author
Feige Wang
  • Function : Author
Richard Green
  • Function : Author
Johan P. U. Fynbo
  • Function : Author
Elisabeth M. Green
  • Function : Author
Yun-Hsin Huang
  • Function : Author
Jennifer Kadowaki
  • Function : Author
Anna Patej
  • Function : Author
Ya-Lin Wu
  • Function : Author
Minghao Yue
  • Function : Author

Abstract

We have designed the Extremely Luminous Quasar Survey (ELQS) to provide a highly complete census of unobscured UV-bright quasars during the cosmic noon, z = 2.8-5.0. Here we report the discovery of 70 new quasars in the ELQS South Galactic Cap (ELQS-S) quasar sample, doubling the number of known extremely luminous quasars in 4237.3 deg2 of the Sloan Digital Sky Survey footprint. These observations conclude the ELQS and we present the properties of the full ELQS quasar catalog, containing 407 quasars over 11,838.5 deg2. Our novel ELQS quasar selection strategy resulted in unprecedented completeness at the bright end and allowed us to discover 109 new quasars in total. This marks an increase of ∼36% (109/298) in the known population at these redshifts and magnitudes, while we further are able to retain a selection efficiency of ∼80%. On the basis of 166 quasars from the full ELQS quasar catalog, which adhere to the uniform criteria of the Two Micron All Sky Survey point source catalog, we measure the bright-end quasar luminosity function (QLF) and extend it one magnitude brighter than previous studies. Assuming a single power law with exponential density evolution for the functional form of the QLF, we retrieve the best-fit parameters from a maximum likelihood analysis. We find a steep bright-end slope of β ≈ -4.1, and we can constrain the bright-end slope to β ≤ -3.4 with 99% confidence. The density is well modeled by the exponential redshift evolution, resulting in a moderate decrease with redshift (γ ≈ -0.4).

Dates and versions

insu-03747949 , version 1 (09-08-2022)

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Jan-Torge Schindler, Xiaohui Fan, Ian D. Mcgreer, Jinyi Yang, Feige Wang, et al.. The Extremely Luminous Quasar Survey in the Sloan Digital Sky Survey Footprint. III. The South Galactic Cap Sample and the Quasar Luminosity Function at Cosmic Noon. The Astrophysical Journal, 2019, 871, ⟨10.3847/1538-4357/aaf86c⟩. ⟨insu-03747949⟩
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