Measuring Omega Baryon from the Helium Lyman-Alpha Forest

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dc.creatorWadsley, James W.
dc.creatorHogan, Craig J.
dc.creatorAnderson, Scott F.
dc.date1999-11-21
dc.date.accessioned2026-07-07T02:34:34Z
dc.date.available2026-07-07T02:34:34Z
dc.descriptionA new method to extract Omega_b 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 Omega_b h^2 = 0.013^{+0.002}_{-0.001} (1-sigma statistical errors, for a Lambda-CDM cosmology with additional systematic uncertainties) consistent with other estimates.
dc.description7 Pages, 2 Figures, to appear in the proceedings of Clustering at High Redshift, IGRAP International Conference, Marseilles, June 29-July 2, 1999
dc.identifierhttps://arxiv.org/abs/astro-ph/9911394
dc.identifierhttp://arxiv.org/abs/astro-ph/9911394
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/15295
dc.subjectAstrophysics
dc.titleMeasuring Omega Baryon from the Helium Lyman-Alpha Forest
dc.typetext

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