Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 415, Issue 1, Pages L1-L5Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1745-3933.2011.01063.x
Keywords
black hole physics; galaxies: high-redshift; quasars: individual: CFHQS J2329-0301; early Universe
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Funding
- Japan Society for the Promotion of Science (JSPS)
- Department of Astronomical Science, The Graduate University for Advanced Studies, Japan
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Understanding the cosmic reionization is one of the key goals of the modern observational cosmology. High-redshift quasi-stellar object (QSO) spectra can be used as background light sources to measure the absorption by the intervening neutral hydrogen. We investigate the neutral hydrogen absorption in a deep, moderate-resolution Keck/Deimos spectrum of the QSO CFHQS J2329-0301 at z = 6.4. This QSO is one of the highest redshift QSOs presently known at z = 6.4 but is 2.5mag fainter than a previously well-studied QSO SDSS J1148+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 5.915 < Z(abs) < 6.365 (200 comoving Mpc) is consistent with zero in Ly alpha, Ly beta and Ly gamma absorption measurements. This corresponds to the lower limit of the optical depth, tau(alpha)(eff) > 4.9. These results are consistent with the strong evolution of the optical depth at z > 5.7.
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