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1987•The Astrophysical JournalRequires access

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

Charles C. Steidel, W. L. W. Sargent

Open publisher page 59 citations

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, nH 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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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, nH 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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Available 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, nH I(z = 0.0) < 9.0×10-14h100cm-3, is approximately 15 times smaller than the limit originally proposed by Gunn and Peterson.

Key concepts: QSOS, Intergalactic travel, Physics, Quasar, Lyman-alpha forest, Astrophysics, Lyman limit, Redshift

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