A luminous quasar at a redshift of z = 7.085

Daniel J. Mortlock (), Stephen J. Warren, Bram P. Venemans, Mitesh Patel, Paul C. Hewett, Richard G. McMahon, Chris Simpson, Tom Theuns, Eduardo A. Gonzáles-Solares, Andy Adamson, Simon Dye, Nigel C. Hambly, Paul Hirst, Mike J. Irwin, Ernst Kuiper, Andy Lawrence and Huub J. A. Röttgering
Additional contact information
Daniel J. Mortlock: Astrophysics Group, Imperial College London, Blackett Laboratory
Stephen J. Warren: Astrophysics Group, Imperial College London, Blackett Laboratory
Bram P. Venemans: European Southern Observatory, 2 Karl-Schwarzschild Strasse
Mitesh Patel: Astrophysics Group, Imperial College London, Blackett Laboratory
Paul C. Hewett: Institute of Astronomy
Richard G. McMahon: Institute of Astronomy
Chris Simpson: Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf
Tom Theuns: Institute for Computational Cosmology, University of Durham
Eduardo A. Gonzáles-Solares: Institute of Astronomy
Andy Adamson: Joint Astronomy Centre, 660 North A'oho¯ku¯ Place
Simon Dye: School of Physics and Astronomy, University of Nottingham, University Park
Nigel C. Hambly: Institute for Astronomy, SUPA (Scottish Universities Physics Alliance), University of Edinburgh, Royal Observatory, Blackford Hill
Paul Hirst: Gemini Observatory, 670 North A'oho¯ku¯ Place
Mike J. Irwin: Institute of Astronomy
Ernst Kuiper: Leiden Observatory, Leiden University, PO Box 9513
Andy Lawrence: Institute for Astronomy, SUPA (Scottish Universities Physics Alliance), University of Edinburgh, Royal Observatory, Blackford Hill
Huub J. A. Röttgering: Leiden Observatory, Leiden University, PO Box 9513

Nature, 2011, vol. 474, issue 7353, 616-619

Abstract: Redshift 'record' for luminous quasar Quasars have historically been identified in optical surveys, which are insensitive to sources at z > 6.5. Infrared deep-sky survey data now make it possible to explore higher redshifts, with the result that a luminous quasar (ULAS J1120+0641) with a redshift z = 7.085, beyond the previous high of z = 6.44, has now been identified. Further observations of this and other distant quasars should reveal the ionization state of the Universe as it was only about 0.75 billion years after the Big Bang.

Date: 2011
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DOI: 10.1038/nature10159

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