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The Deuterium to Hydrogen Abundance Ratio Towards a Fourth QSO: HS0105+1619
Astrophysics · Submitted 8 Nov 2000
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim Combined with prior measurements of D/H, the best D/H ratio is now D/H$ = 3.0 \pm 0.4 \times 10^{-5}$, which is 10% lower than the previous value.
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The abstract, sentence by sentence
We report the measurement of the primordial D/H abundance ratio towards QSO \object. The column density of the hydrogen in the $z \simeq 2.536$ Lyman limit system is high, \lnhi $= 19.422 \pm 0.009$ \cmm, allowing for the deuterium to be seen in 5 Lyman series transitions. The measured value of the D/H ratio towards QSO \object is found to be D/H$ = 2.54 \pm 0.23 \times 10^{-5}$. The metallicity of the system showing D/H is found to be $\simeq 0.01$ solar, indicating that the measured D/H is the primordial D/H within the measurement errors. The gas which shows D/H is neutral, unlike previous D/H systems which 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 \pm 0.4 \times 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 $\eta = 5.6 \pm 0.5 \times 10^{-10} $ and \ob $=0.0205 \pm 0.0018$ respectively.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We report the measurement of the primordial D/H abundance ratio towards QSO \object. | contribution 0.99 | 0.96 | 0.12 | asserted 0.99 |
| s1 | The column density of the hydrogen in the $z \simeq 2.536$ Lyman limit system is high, \lnhi $= 19.422 \pm 0.009$ \cmm, allowing for the deuterium to be seen in 5 Lyman series transitions. | result 0.72 | 0.83 | 0.03 | asserted 1.00 |
| s2 | The measured value of the D/H ratio towards QSO \object is found to be D/H$ = 2.54 \pm 0.23 \times 10^{-5}$. | result 1.00 | 0.97 | 0.52 | asserted 1.00 |
| s3 | The metallicity of the system showing D/H is found to be $\simeq 0.01$ solar, indicating that the measured D/H is the primordial D/H within the measurement errors. | interpretation 0.75 | 0.94 | 0.12 | hedged possibility 0.82 |
| s4 | The gas which shows D/H is neutral, unlike previous D/H systems which were more highly ionized. | result 0.97 | 0.82 | 0.04 | asserted 1.00 |
| s5 | 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. | interpretation 0.96 | 0.66 | 0.12 | asserted 0.99 |
| s6 | Combined with prior measurements of D/H, the best D/H ratio is now D/H$ = 3.0 \pm 0.4 \times 10^{-5}$, which is 10% lower than the previous value. | result 0.99 | 0.74 | 0.40 | asserted 1.00 |
| s7 | The new values for the baryon to photon ratio, and baryonic matter density derived from D/H are $\eta = 5.6 \pm 0.5 \times 10^{-10} $ and \ob $=0.0205 \pm 0.0018$ respectively. | result 0.94 | 0.87 | 0.20 | asserted 1.00 |
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The paper
Original abstract
We report the measurement of the primordial D/H abundance ratio towards QSO \object. The column density of the hydrogen in the $z \simeq 2.536$ Lyman limit system is high, \lnhi $= 19.422 \pm 0.009$ \cmm, allowing for the deuterium to be seen in 5 Lyman series transitions. The measured value of the D/H ratio towards QSO \object is found to be D/H$ = 2.54 \pm 0.23 \times 10^{-5}$. The metallicity of the system showing D/H is found to be $\simeq 0.01$ solar, indicating that the measured D/H is the primordial D/H within the measurement errors. The gas which shows D/H is neutral, unlike previous D/H systems which 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 \pm 0.4 \times 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 $\eta = 5.6 \pm 0.5 \times 10^{-10} $ and \ob $=0.0205 \pm 0.0018$ respectively.
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References
How the literature uses it
12 arXiv papers cite this in 12 sentences
Papers citing it · 7 sentences without a confident label
Uses its data or values 5 papers
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Before moving ahead with the investigation of the background phenomenology, we want to consider the predictions of BBN and EDE constraints to give us an informative limit on the parameters of the sLog model: * BBN constraint: The BBN constraint on the helium abundance is $|ΔY_p| < 0.01$ [ref] and it can be related to the effective cosmological gravitational coupling, $G_c$.
Cosmological study of a symmetric teleparallel gravity model · sLog model · 0.96
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These are the results tabulated in [ref] [from [ref] ] plus those of [ref] and [ref] .
On Possible Variation in the Cosmological Baryon Fraction · $^2H$ · 1.00
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The weighted mean of these measurements, $D/H = (2.82 ±0.26) ×10^-5$ [ref] , agrees well with the prediction of standard BBN with the baryon-to-photon ratio inferred by observations of the CMB anisotropy [ref] .
New cosmological constraints on primordial black holes · Current status of observations of light elements · 0.82
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