A High Deuterium Abundance at z=0.7; Evidence for Cosmic Inhomogeneity?
J. K. Webb, R. F. Carswell, K. M. Lanzetta, R. Ferlet, M. Lemoine, A. Vidal-Madjar
Abstract
Recent HST/GHRS observations of the z = 0.7010 absorber toward the QSO 1718+4807 (selected because of apparently ideal characteristics for measuring D/H) yield a D/H significantly higher D/H than some recent high-redshift measurements. Our analysis indicates D/H= 1.8 - 2.5 x 10-4. This may indicate a cosmological inhomogeneity in the deuterium abundance of at least a factor of ten.
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