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The Deuterium Abundance at [FORMULA][F]z=0.701[/F][/FORMULA][CLC][ITAL]z[/ITAL][/CLC] = 0.701 toward QSO 1718+4807
1999
Astronomical Journal
We present constraints on the deuterium to hydrogen ratio (D/H) in the metal-poor gas cloud at redshift z=0.701 towards QSO 1718+4807. We use new Keck spectra in addition to Hubble Space Telescope (HST) and International Ultraviolet Explorer (IUE) spectra. We use an improved redshift and a lower column density to model the absorption. The HST spectrum shows an asymmetric Lyman-α () feature which is produced by either at a second velocity, or a high abundance of D. Three models with a single
doi:10.1086/300715
fatcat:oryglsk2ordl5ibzo4pynla2y4