The Deuterium Abundance Towards Q1937-1009

Abstract

We present a new measurement of the deuterium-to-hydrogen ratio (D/H) in the Lyman limit absorption system at $z=3.572$ towards Q1937--1009. We use an improved method to measure D/H in QSO absorption systems, which includes extra parameters to treat the continuum uncertainties, a variety of new absorption models which allow for undetected velocity structure, and the improved measurement of the total hydrogen column density by Burles & Tytler (1997a). We find that all models, including contamination, give an upper limit D/H $<3.9\times 10^{-5}$ (95 % confidence). Both this and previous analyses find contamination to be unlikely in this absorption system, A ${\chi }^2$ analysis in models without contamination gives D/H $=3.3\pm 0.3\times 10^{-5}$ (67% confidence), which is higher but consistent with the earlier results of Tytler et al. (1996), and a second measurement of D/H towards Q1009+2956 (Burles & Tytler 1997). With calculations of standard big bang nucleosynthesis (SBBN) and the assumption that this measurement of D/H is representative of the primordial value, we find a high baryon-to-photon ratio, $\eta =5.3\pm 0.4\times 10^{-10}$. This is consistent with primordial abundance determinations of ${}^4$He in H II regions (Izotov et al. 1997) and ${}^7$Li in the atmospheres of warm metal-poor population II stars (Bonifacio & Molaro 1997). We find a high value for the present-day baryon density, ${\Omega }_b{h}^2=0.0193\pm 0.0014$, which is consistent with other inventories of baryonic matter, from low to high redshift: clusters of galaxies, the Lyman alpha forest & the Cosmic Microwave Background.

49 pages, 19 figures, to appear in the Astrophysical Journal

References in corpus (8)

• The Opacity of the Lyman Alpha Forest and Implications for Omega_{baryon} and the Ionizing Background
• The baryon content of the Universe
• A Lower Bound on the Cosmic Baryon Density
• A High Deuterium Abundance at z=0.7
• Intrinsic Properties of the <z>=2.7 Lyman Alpha Forest from Keck Spectra of QSO HS 1946+7658
• Measurements of the Sunyaev-Zeldovich Effect in the Nearby Clusters A478, A2142 and A2256
• The Neutral Hydrogen Column Density towards Q1937--1009 from the Unabsorbed Intrinsic Continuum in the Lyman-$\alpha$ Forest
• The Stellar UV Background at z<1.5 and the Baryon Density of Photoionized Gas

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