z=6.4时具有QSO的Gunn-Peterson检验
A Gunn-Peterson test with a QSO at z=6.4
摘要：
理解宇宙再电离是现代观测宇宙学的重要目标之一。高红移的类星体光谱可以作为背景光源来测量中性氢的吸收。我们调查中性氢吸收的深，中等分辨率的凯克/Deimos光谱的类星体CFHQSJ 2329 -0301在z=6.4。这个类星体是目前已知的红移最高的类星体之一，z=6.4，但比之前研究得很好的类星体SDSSJ 1148 +5251（z=6.4）暗2.5等。因此，它有一个较小的斯特罗姆格伦球，并允许我们探测迄今为止最高的红移氢吸收。在Ly_alpha、Ly_beta和Ly_gamma吸收测量中，在5.915<z_abs<6.365（200共动Mpc）处的平均透射通量与零一致。这对应于光学深度的下限，τ_eff>4.9。这些结果与z>5.7时光学深度的强烈演化一致。
英文摘要：
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 5.915<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 optical depth, tau_eff>4.9. These results are consistent with strong evolution of the optical depth at z>5.7.
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