Primordial deuterium abundance at z abs = 2:504 towards Q1009+2956
نویسندگان
چکیده
منابع مشابه
Primordial Deuterium Abundance and Cosmic Baryon Density
The comparison of cosmic abundances of the light elements with the density of baryonic stars and gas in the universe today provides a critical test of big bang theory and a powerful probe of the nature of dark matter. A new technique allows determination of cosmic deuterium abundances in quasar absorption clouds at large redshift, allowing a new test of big bang homogeneity in diverse, very dis...
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A very low primordial deuterium abundance of D/H ≃ 1.5 × 10 has recently been proposed by Molaro et al. in the Lyman limit system with logNH i ≃ 18.1 cm at za = 3.514 towards the quasar APM 08279+5255. The D/H value was estimated through the standard Voigt fitting procedure utilizing a simple one-component model of the absorbing region. We have investigated this system using our new Monte Carlo...
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We report the discovery of deuterium absorption in the very metal-poor ([Fe/H]=−2.88) damped Lyman-α system at zabs = 3.06726 toward the QSO SDSS J1358+6522. On the basis of 13 resolved D i absorption lines and the damping wings of the H i Lyman α transition, we have obtained a new, precise measure of the primordial abundance of deuterium. Furthermore, to bolster the present statistics of preci...
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The discordance between ‘low’ and ‘high’ primordial D/H measurements can be considerably reduced if the analysis of the H+D profiles accounts for the correlated velocity field of bulk motion. We have re-estimated the value of D/H at z = 3.572 towards Q1937–1009 (‘low’ D/H = (3.3±0.3)×10 [3]) and at z = 0.701 towards Q1718+4807 (‘high’ D/H = (2.0±0.5)×10 [15]) and found that a single D/H value f...
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We discuss how measurements of fluctuations in the absorption of cosmic microwave background photons by neutral gas at redshifts z approximately 7-200 could reveal the primordial deuterium abundance of the Universe. The strength of the cross-correlation of brightness-temperature fluctuations in the redshifted 21-cm line of hydrogen with those in the redshifted 92-cm line of deuterium is proport...
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ژورنال
عنوان ژورنال: Journal of Physics: Conference Series
سال: 2018
ISSN: 1742-6588,1742-6596
DOI: 10.1088/1742-6596/1038/1/012012