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Title:
The Deuterium to Hydrogen Abundance Ratio toward a Fourth QSO: HS 0105+1619
Authors:
O'Meara, John M.; Tytler, David; Kirkman, David; Suzuki, Nao; Prochaska, Jason X.; Lubin, Dan; Wolfe, Arthur M.
Affiliation:
AA(; Visiting Astronomer, W. M. Keck Observatory, which is a joint facility of the University of California, the California Institute of Technology, and NASA.; .), AB(; Visiting Astronomer, W. M. Keck Observatory, which is a joint facility of the University of California, the California Institute of Technology, and NASA.; .), AC(; .), AD(Center for Astrophysics and Space Sciences, University of California, San Diego, MS 0424, La Jolla, CA 92093-0424; .), AE(Center for Astrophysics and Space Sciences, University of California, San Diego, MS 0424, La Jolla, CA 92093-0424; Visiting Astronomer, W. M. Keck Observatory, which is a joint facility of the University of California, the California Institute of Technology, and NASA.; Observatories of the Carnegie Institute of Washington; .), AF(Center for Astrophysics and Space Sciences, University of California, San Diego, MS 0424, La Jolla, CA 92093-0424; .), AG(Center for Astrophysics and Space Sciences, University of California, San Diego, MS 0424, La Jolla, CA 92093-0424)
Publication:
The Astrophysical Journal, Volume 552, Issue 2, pp. 718-730. (ApJ Homepage)
Publication Date:
05/2001
Origin:
UCP
ApJ Keywords:
Cosmology: Observations, Galaxies: Intergalactic Medium, Galaxies: Quasars: Absorption Lines, Galaxies: Quasars: Individual: Alphanumeric: HS 0105+1619
DOI:
10.1086/320579
Bibliographic Code:
2001ApJ...552..718O

Abstract

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, logNHI=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 D/H within the measurement errors. The gas that shows D/H is neutral, unlike previous D/H systems that were more highly ionized. Thus, the determination of the D/H ratio becomes more secure since we are measuring it in different astrophysical environments, but the error is larger because we now see more dispersion between measurements. Combined with prior measurements of D/H, the best D/H ratio is now D/H=3.0+/-0.4×10-5, which is 10% lower than the previous value. The new values for the baryon-to-photon ratio and baryonic matter density derived from D/H are η=5.6+/-0.5×10-10 and Ωbh2=0.0205+/-0.0018, respectively.
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