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On the Measurements of D/H in QSO Absorption Systems Closing in on the primordial abundance of deuterium
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On the Measurements of D/H in QSO Absorption Systems Closing in on the primordial abundance of deuterium S. Burles1 and D. Tytler2 | (1) | Department of Astronomy & Astrophysics, University of Chicago, 5640 S. Ellis Ave, Chicago, IL, 60637 |
| (2) | Center for Astronomy and Astrophysics, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA, 92093-0424 |
Abstract We present our measurements of the deuterium to hydrogen ratio (D/H) in QSO absorption systems, which give D/H = 3.40 ± 0.25 × 10-5 based on analysis of four independent systems. We discuss the properties of two systems which provide the strongest constraints on D/H. We outline the systematic effects involved in measurements of D/H and introduce a sophisticated method of analysis which properly accounts for these effects. Cosmology - nucleosynthesis - abundances - Quasars: absorption lines
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