Filling in the quasar redshift gap at z ∼ 5.5. II. A complete survey of luminous quasars in the post-reionization universe

Jinyi Yang, Feige Wang, Xiaohui Fan, Xue Bing Wu, Fuyan Bian, Eduardo Banãdos, Minghao Yue, Jan Torge Schindler, Qian Yang, Linhua Jiang, Ian D. McGreer, Richard Green, Simon Dye

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We present the final results from our survey of luminous z ∼ 5.5 quasars. This is the first systematic quasar survey focusing on quasars at z ∼ 5.5, during the post-reionization epoch. It has been challenging to select quasars at 5.3 < z < 5.7 using conventional color selections, due to their similar optical colors to those of late-type stars, especially M dwarfs. We developed a new selection technique for z ∼ 5.5 quasars based on optical, near-infrared (IR), and mid-IR photometry, using data from the Sloan Digital Sky Survey (SDSS), PanSTARR1 (PS1), the UKIRT Infrared Deep Sky Surveys-Large Area Survey, the UKIRT Hemisphere Survey, the VISTA Hemisphere Survey, and the Wide Field Infrared Survey Explorer, covering ∼11,000 deg 2 of high galactic latitude sky. In this paper, we present the discovery of 15 new quasars at 5.22 ≤ z ≤ 5.78. Together with results from Yang et al., our survey provides a complete, flux-limited sample of 31 quasars at 5.3 ≤ z ≤ 5.7. We measure the quasar spatial density at z ∼ 5.5 and M 1450 <-26.2. Our result is consistent with the rapid decline of the quasar spatial density from z = 5 to 6, with k =-0.66 ± 0.05 (ρ(z) ∝ 10 kz ). In addition, we present a new survey using optical colors only from the full PS1 area for luminous quasars at z = 5.0-5.5, which is beyond the SDSS footprint, and report the preliminary results from this survey, including 51 new quasars discovered at 4.61 ≤ z ≤ 5.71.

Original languageEnglish (US)
Article number199
JournalAstrophysical Journal
Volume871
Issue number2
DOIs
StatePublished - Feb 1 2019

Fingerprint

quasars
universe
hemispheres
color
Wide-field Infrared Survey Explorer
infrared photometry
footprints
footprint
sky
coverings
near infrared
time measurement
stars

Keywords

  • galaxies: Active
  • galaxies: High-redshift
  • quasars: Emission lines

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Filling in the quasar redshift gap at z ∼ 5.5. II. A complete survey of luminous quasars in the post-reionization universe. / Yang, Jinyi; Wang, Feige; Fan, Xiaohui; Wu, Xue Bing; Bian, Fuyan; Banãdos, Eduardo; Yue, Minghao; Schindler, Jan Torge; Yang, Qian; Jiang, Linhua; McGreer, Ian D.; Green, Richard; Dye, Simon.

In: Astrophysical Journal, Vol. 871, No. 2, 199, 01.02.2019.

Research output: Contribution to journalArticle

Yang, J, Wang, F, Fan, X, Wu, XB, Bian, F, Banãdos, E, Yue, M, Schindler, JT, Yang, Q, Jiang, L, McGreer, ID, Green, R & Dye, S 2019, 'Filling in the quasar redshift gap at z ∼ 5.5. II. A complete survey of luminous quasars in the post-reionization universe', Astrophysical Journal, vol. 871, no. 2, 199. https://doi.org/10.3847/1538-4357/aaf858
Yang, Jinyi ; Wang, Feige ; Fan, Xiaohui ; Wu, Xue Bing ; Bian, Fuyan ; Banãdos, Eduardo ; Yue, Minghao ; Schindler, Jan Torge ; Yang, Qian ; Jiang, Linhua ; McGreer, Ian D. ; Green, Richard ; Dye, Simon. / Filling in the quasar redshift gap at z ∼ 5.5. II. A complete survey of luminous quasars in the post-reionization universe. In: Astrophysical Journal. 2019 ; Vol. 871, No. 2.
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AU - Wu, Xue Bing

AU - Bian, Fuyan

AU - Banãdos, Eduardo

AU - Yue, Minghao

AU - Schindler, Jan Torge

AU - Yang, Qian

AU - Jiang, Linhua

AU - McGreer, Ian D.

AU - Green, Richard

AU - Dye, Simon

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