A new upper limit on the density of generally distributed intergalactic neutral hydrogen

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Abstract

A new upper limit on the number density of generally distributed intergalactic neutral hydrogen is obtained based upon recent spectrophotometric observations of very high redshift QSOs coupled with high-resolution statistical studies of the Lyα forest in QSOs. The new limit, n_{H I}(z = 0.0) < 9.0×10-14h₁₀₀cm-3, is approximately 15 times smaller than the limit originally proposed by Gunn and Peterson.

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