A High Deuterium Abundance at z=0.7; Evidence for Cosmic Inhomogeneity?
Webb, J. K. · Carswell, R. F. · Lanzetta, K. M. · Ferlet, R. · Lemoine, M. · Vidal-Madjar, A.
Original · EN
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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