Measuring Omega Baryon from the Helium Lyman-Alpha Forest
Wadsley, James W. · Hogan, Craig J. · Anderson, Scott F.
Original · EN
A new method to extract Omegab from high redshift intergalactic absorption is described, based on the distribution of HeII Ly-alpha optical depths in the voids in the ionization zone of quasars. A preliminary estimate from recent HST-STIS spectra of PKS 1935-692 at z=3 gives Omegab h² = 0.013⁺⁰.⁰⁰²₋₀.₀₀₁ (1-sigma statistical errors, for a Lambda-CDM cosmology with additional systematic uncertainties) consistent with other estimates.
English translation
This paper has no Arabic translation yet. Be the first: it takes a few seconds, and the result is stored for every future reader.