期刊
ASTROPHYSICAL JOURNAL
卷 628, 期 2, 页码 575-582出版社
IOP PUBLISHING LTD
DOI: 10.1086/430874
关键词
cosmology : theory; galaxies : formation; intergalactic medium
We analyze the evolution of H II regions around the seven known SDSS quasars at z > 6. The comparison between the observed and model radii of the H II regions generated by these quasars individually suggests that the surrounding intergalactic hydrogen is significantly neutral. When all constraints are combined, the existing quasar sample implies a volume-averaged neutral fraction that is larger than 10% at z > 6. This limited sample permits a preliminary analysis of the correlations between the quasar parameters, the sizes of their H II regions, and the associated constraints on the neutral hydrogen fraction. We find no evidence in these correlations to contradict the interpretation that the red side of the Gunn-Peterson trough corresponds to the boundary between an H II region and a partially neutral IGM.
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