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The intergalactic medium was not completely reionized until approximately a billion years after the Big Bang, as revealed by observations of quasars with redshifts of less than 6.5.
On the density of neutral hydrogen in intergalactic space
Gunn, J. E. & Peterson, B. A · 1965
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The FIRST Survey: Faint Images of the Radio Sky at Twenty Centimeters
Becker, R. H., White, R. L. & Helfand, D. J · 1995
Earlier work this paper cites.
Reionization of the intergalactic medium and the damping wing of the Gunn-Peterson trough
Miralda-Escude, J · 1998
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The Sloan Digital Sky Survey: Technical summary
York, D. G · 2000
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The rest-frame extreme-ultraviolet spectral properties of quasi-stellar objects
Telfer, R. C., Zheng, W., Kriss, G. A. & Davidsen, A. F · 2002
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The Detectability of High-Redshift Ly
Haiman, Z · 2002
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Probing the ionization state of the Universe at z
White, R. L., Becker, R. H., Fan, X. & Strauss, M. A · 2003
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Evidence of a cosmological Strömgren surface and of significant neutral hydrogen surrounding the quasar SDSS J1030+0524
Mesinger, A. & Haiman, Z · 2004
Earlier work this paper cites.
Improved constraints on the neutral intergalactic hydrogen surrounding quasars at redshifts z
Wyithe, J. S. B., Loeb, A. & Carilli, C · 2005
Cited alongside, same era.
Constraining the evolution of the ionizing background and the epoch of reionization with z
Fan, X. et al · 2006
Cited alongside, same era.
Quasars at z
Volonteri, M. & Rees, M. J · 2006
Cited alongside, same era.
The UKIRT Infrared Deep Sky Survey (UKIDSS)
Lawrence, A · 2007
Cited alongside, same era.
Four quasars above redshift 6 discovered by the Canada-France High-z Quasar Survey
Willott, C. J · 2007
Cited alongside, same era.
The nature and evolution of the highly ionized near-zones in the absorption spectra of z
Bolton, J. S. & Haehnelt, M. G · 2007
Cited alongside, same era.
The Canada-France High-z Quasar Survey: Nine new quasars and the luminosity function at redshift 6
Willott, C. J · 2010
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Spectroscopic confirmation of a galaxy at redshift z
Lehnert, M. D · 2010
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Eddington-limited accretion and the black hole mass function at redshift 6
Willott, C. J · 2010
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Improved redshifts for SDSS quasar spectra
Hewett, P. C. & Wild, V · 2010
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Ionization near zones associated with quasars at z
Carilli, C. L · 2010
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Probabilistic photometric quasar selection
Mortlock, D. J · 2011
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Five-year Wilkinson Microwave Anisotropy Probe observations: Likelihoods and parameters from the WMAP data
Dunkley, J · 2009
Cited alongside, same era.
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
Vestergaard, M. & Osmer, P. S · 2009
Cited alongside, same era.
A survey of z
Fan, X., Narayanan, V. K., Lupton, R. H. & et al
Cited in the paper.
A survey of z
Fan, X., Strauss, M. A., Schneider, D. P. & et al
Cited in the paper.
The origin and detection of high-redshift supermassive black holes
Haiman, Z
Cited in the paper.
Measurements of the UV background at 4.6
Calverley, A. P., Becker, G. D., Haehnelt, M. G. & Bolton, J. S
Cited in the paper.
Spectroscopic confirmation of two Lyman break galaxies at redshift beyond 7
Vanzella, E · 2011
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Unification of luminous Type 1 quasars through C IV emission
Richards, G. T · 2011
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