The Deuterium to Hydrogen Abundance Ratio toward a Fourth QSO: HS 0105+1619

  title={The Deuterium to Hydrogen Abundance Ratio toward a Fourth QSO: HS 0105+1619},
  author={John M. O’Meara and David Tytler and David Kirkman and Nao Suzuki and Jason Xavier Prochaska and Dan Lubin and Arthur M. Wolfe},
  journal={The Astrophysical Journal},
  pages={718 - 730}
We report the measurement of the primordial D/H abundance ratio toward QSO HS 0105+1619. The column density of the neutral hydrogen in the z ≃ 2.536 Lyman limit system is high, log N = 19.422 ± 0.009 cm-2, allowing for the deuterium to be seen in five Lyman series transitions. The measured value of the D/H ratio toward QSO HS 0105+1619 is found to be D/H = 2.54 ± 0.23 × 10-5. The metallicity of the system showing D/H is found to be ≃0.01 solar, indicating that the measured D/H is the primordial… 

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