A Gunn-Peterson test with a QSO at z=6.4

  title={A Gunn-Peterson test with a QSO at z=6.4},
  author={Tomotsugu Goto and Yousuke Utsumi and Takashi Hattori and Satoshi Miyazaki and Chisato Yamauchi},
  journal={arXiv: Cosmology and Nongalactic Astrophysics},
Understanding the cosmic re-ionization is one of the key goals of the modern observational cosmology. High redshift QSO spectra can be used as background light sources to measure absorption by intervening neutral hydrogen. We investigate neutral hydrogen absorption in a deep, moderate-resolution Keck/Deimos spectrum of QSO CFHQSJ2329-0301 at z=6.4. This QSO is one of the highest redshift QSOs presently known at z=6.4 but is 2.5 mag fainter than a previously well-studied QSO SDSSJ1148+5251 at z… Expand

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