Evidence for reionization at z ∼ 6: Detection of a gunn-peterson trough in a z = 6.28 quasar

  title={Evidence for reionization at z ∼ 6: Detection of a gunn-peterson trough in a z = 6.28 quasar},
  author={Robert H. Becker and Xiaohui Fan and Richard L. White and Michael A. Strauss and Vijay K. Narayanan and Robert H. Lupton and James E. Gunn and James T. Annis and Neta A. Bahcall and Jonathan V. Brinkmann and Andrew J. Connolly and Istv{\'a}n Csabai and P. Czarapata and Mamoru Doi and Timothy M. Heckman and Gregory S. Hennessy and Željko Ivezi{\'c} and G. R. Knapp and Donald Q. Lamb and Timothy A. Mckay and Jeffrey A. Munn and Thomas Nash and Robert Nichol and Jeffrey R. Pier and Gordon T. Richards and Donald P. Schneider and Chris Stoughton and Alexander S. Szalay and Anirudda R. Thakar and Donald G. York},
  journal={The Astronomical Journal},
We present moderate-resolution Keck spectroscopy of quasars at z = 5.82, 5.99, and 6.28, discovered by the Sloan Digital Sky Survey (SDSS). We find that the Ly? absorption in the spectra of these quasars evolves strongly with redshift. To z ~ 5.7, the Ly? absorption evolves as expected from an extrapolation from lower redshifts. However, in the highest-redshift object, SDSSp J103027.10+052455.0 (z = 6.28), the average transmitted flux is 0.0038 ? 0.0026 times that of the continuum level over… 

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