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

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

2011-04-08

arxiv.org/abs/1104.1636v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

5 pages, 4 figures. Accepted for publication in MNRAS

Scientific paper

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=6.4. Therefore, it has a smaller Stromgren sphere, and allows us to probe the highest redshift hydrogen absorption to date. The average transmitted flux at 5.9154.9. These results are consistent with strong evolution of the optical depth at z>5.7.

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