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So far, roughly 40 quasars with redshifts greater than z=6 have been discovered.
Gunn, J. E., & Peterson, B. A. On the Density of Neutral Hydrogen in Intergalactic Space. Astrophysical Journal
1965
Earlier work this paper cites.
Fan, X., et al. The discovery of a high-redshift quasar without emission lines from sloan digital sky survey commissioning data. Astrophysical Journal
1999
Earlier work this paper cites.
York, D. G. et al. The Sloan Digital Sky Survey: Technical Summary. Astronomical Journal
2000
Earlier work this paper cites.
Vanden Berk, D. E. et al. Composite quasar spectra from the Sloan Digital Sky Survey. Astronomical Journal
2001
Earlier work this paper cites.
Vestergaard, M. & Wilkes, B. J. An Empirical Ultraviolet Template for Iron Emission in Quasars as Derived from I Zwicky 1. Astrophysical Journal Supplement Series
2001
Earlier work this paper cites.
Fan, X. et al. A Survey of z > > 5.7 Quasars in the Sloan Digital Sky Survey. II. Discovery of Three Additional Quasars at z > 6 z>6 . Astronomical Journal
2003
Earlier work this paper cites.
Willott, C. J., McLure, R. J., & Jarvis, M. J. A 3 × 10 9 M s o l a r \times 10^{9}M_{solar} Black Hole in the Quasar SDSS J1148+5251 at z=6.41. Astrophysical Journal
2003
Earlier work this paper cites.
McLure, R. J. & Dunlop, J. S. The cosmological evolution of quasar black hole masses. Monthly Notes of Royal Astronomical Society
2004
Earlier work this paper cites.
Peterson, B. M. et al. Central Masses and Broad-Line Region Sizes of Active Galactic Nuclei. II. A Homogeneous Analysis of a Large Reverberation-Mapping Database. Astrophysical Journal
2004
Earlier work this paper cites.
Haiman, Z. et al. Constraining Reionization with the Evolution of the Luminosity Function of Ly α \alpha Emitting Galaxies. Astronomical Journal
2005
Earlier work this paper cites.
Fan, X., Carilli, C. L., & Keating, B. Observational Constraints on Cosmic Reionization. Annual Review of Astronomy & Astrophysics
2006
Earlier work this paper cites.
Skrutskie, M. F. et al. The Two Micron All Sky Survey (2MASS). Astronomical Journal
2006
Earlier work this paper cites.
Jiang, L. et al. Gemini Near-Infrared Spectroscopy of Luminous z ∼ 6 z\sim 6 Quasars: Chemical Abundances, Black Hole Masses, and Mg II Absorption. Astronomical Journal
2007
Cited alongside, same era.
Willott, C. J., et al. Four quasars above redshift 6 discovered by the Canada-France high-z quasar survey. Astronomical Journal
2007
Cited alongside, same era.
Kurk, J. D. et al. Black Hole Masses and Enrichment of z ∼ 6 z\sim 6 SDSS Quasars. Astrophysical Journal
2007
Cited alongside, same era.
Salviander, S., et al. The Black Hole Mass-Galaxy Bulge Relationship for QSOs in the Sloan Digital Sky Survey Data Release 3. Astrophysical Journal
2007
Cited alongside, same era.
Jiang, L., et al. A survey of z ∼ 6 z\sim 6 quasars in the sloan digital sky survey deep stripe. I. a flux-limited sample at z A B < 21 z_{AB}<21 . Astronomical Journal
2008
Wang, R., et al. Molecular gas in z ∼ 6 z\sim 6 quasar host galaxies. Astrophysical Journal
2010
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Pogge, R. W., et al. The multi-object double spectrographs for the Large Binocular Telescope. SPIE
2010
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Mortlock, D. J. et al. A luminous quasar at a redshift of z=7.085. Nature
2011
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De Rosa, G. et al. Evidence for Non-evolving Fe II/Mg II Ratios in Rapidly Accreting z ∼ 6 z\sim 6 QSOs. Astrophysical Journal
2011
Later among the works it cites.
Shen, Y. et al. A Catalog of Quasar Properties from Sloan Digital Sky Survey Data Release 7. Astrophysical Journal Supplement
2011
Later among the works it cites.
McConnell, N. J. et al. Two ten-billion-solar-mass black holes at the centres of giant elliptical galaxies. Nature
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Cited alongside, same era.
Wang, R., et al. Thermal emission from warm dust in the most distant quasars. Astrophysical Journal
2008
Cited alongside, same era.
Vestergaard, M. & Osmer, P. S. Mass Functions of the Active Black Holes in Distant Quasars from the Large Bright Quasar Survey, the Bright Quasar Survey, and the Color-selected Sample of the SDSS Fall Equatorial Stripe. Astrophysical Journal
2009
Cited alongside, same era.
Willott, C. J. et al. The Canada-France High-z Quasar Survey: Nine New Quasars and the Luminosity Function at Redshift 6. Astronomical Journal
2010
Cited alongside, same era.
Willott, C. J. et al. Eddington-limited accretion and the black hole mass function at redshift 6. Astronomical Journal
2010
Cited alongside, same era.
Wright, E. L. et al. The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance. Astronomical Journal
2010
Cited alongside, same era.
Carilli, C. L. et al. Ionization near zones associated with quasars at z ∼ \sim 6. Astrophysical Journal
2010
Cited alongside, same era.
2011
Later among the works it cites.
Volonteri, M. The Formation and Evolution of Massive Black Holes Science
2012
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Wu, X.-B. et al. SDSS Quasars in the WISE Preliminary Data Release and Quasar Candidate Selection with Optical/Infrared Colours, Astronomical Journal
2012
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Venemans, E. P. et al. Discovery of Three z > > 6.5 Quasars in the VISTA Kilo-Degree Infrared Galaxy (VIKING) Survey. Astrophysical Journal
2013
Later among the works it cites.
Banados, E. et al. Discovering of eight z ∼ 6 z\sim 6 quasars from Pan-STARRS. Astronomical Journal
2014
Later among the works it cites.
De Rosa, G., et al. Black Hole Mass Estimates and Emission-line Properties of a Sample of Redshift z > > 6.5 Quasars. Astrophysical Journal
2014
Later among the works it cites.