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

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

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...318l..11s&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 318, July 1, 1987, p. L11-L13.

Astronomy and Astrophysics

Astrophysics

112

Density Distribution, Gas Density, Hydrogen, Intergalactic Media, Neutral Gases, Quasars, Astronomical Spectroscopy, Gas Ionization, Line Spectra, Lyman Alpha Radiation, Red Shift, Ultraviolet Radiation

Scientific paper

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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