Book ChapterDOI
On the Measurements of D/H in QSO Absorption Systems
Scott Burles,David Tytler +1 more
- pp 65-75
Reads0
Chats0
TLDR
In this article, the deuterium to hydrogen ratio (D/H) in QSO absorption systems was measured and the results showed that D/H = 3.40 ± 0.25 × 10−5 based on analysis of four independent systems.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.read more
Citations
More filters
Journal ArticleDOI
Star Formation and Chemical Evolution in the Milky Way: Cosmological Implications
TL;DR: In this paper, an expression for the star formation rate in spiral galaxies and a model of chemical evolution with a minimal number of adjustable parameters were proposed, which accounts for most of the relevant data in the Milky Way.
Journal ArticleDOI
High Deuterium Abundance in a New Quasar Absorber
Martin H. Rugers,Craig J. Hogan +1 more
TL;DR: In this paper, a new analysis of an absorption system in the spectrum of Q0014+813 was presented, with particular attention to a single cold cloud at redshift 2.797957, and features were identified at this redshift corresponding to SiIII, SiIV, CIV, DI, and HI.
Journal ArticleDOI
Big-Bang Nucleosynthesis in Light of Discordant Deuterium Measurements
TL;DR: In this article, two dimensional concordance plots involving the baryon-to-photon ratio and an effective number of light neutrinos were used to discuss the overall consistency of standard big-bang nucleosynthesis in light of recent determinations of the primordial deuterium ($2$H) abundance.
ReportDOI
The Cryogenic Dark Matter Search: First 5-Tower Data and Improved Understanding of Ionization Collection
TL;DR: The SuperCDMS-II detector as discussed by the authors is a state-of-the-art detector for the detection of WIMPs in the Cryogenic Dark Matter Search (CDMS).
Journal ArticleDOI
Detection of the Li I λ6104 Transition in the Population II Star HD 140283
Piercarlo Bonifacio,Paolo Molaro +1 more
TL;DR: In this article, the first detection of the Li I λ6104 2 2P-3 2D subordinate transition in the prototype Population II star HD 140283 was reported and the same Li abundance of (Li/H)=1.4×10−10 is found to be consistent with both the resonance and subordinate lines.
References
More filters
Journal ArticleDOI
The keck low-resolution imaging spectrometer
J. B. Oke,Judith G. Cohen,Michael A. Carr,John Cromer,A. Dingizian,Frederick H. Harris,S. Labrecque,Richard Lucinio,W. A. Schaal,Harland W. Epps,J. Miller +10 more
TL;DR: The Low Resolution Imaging Spectrometer (LRIS) for the Cassegrain focus of the Keck 10-meter telescope on Mauna Kea is described in this paper, which has an imaging mode so it can also be used for taking direct images.
Proceedings ArticleDOI
HIRES: the high-resolution echelle spectrometer on the Keck 10-m Telescope
Steven S. Vogt,Steven L. Allen,Bruce C. Bigelow,L. Bresee,William E. Brown,T. Cantrall,Al Conrad,M. Couture,Conor P. Delaney,Harland W. Epps,Darrie Hilyard,David F. Hilyard,E. Horn,Neal Jern,Dick Kanto,Michael J. Keane,Robert I. Kibrick,James W. Lewis,Jack Osborne,Gerard H. Pardeilhan,Terry Pfister,T. Ricketts,Lloyd B. Robinson,Richard J. Stover,Dean Tucker,Janice M. Ward,Mingzhi Wei +26 more
TL;DR: The high-resolution echelle spectrometer (HIRES) as discussed by the authors is a standard in-plane spectrograph with grating post dispersion, which is permanently located at a Nasmyth focus.
Journal ArticleDOI
Primordial nucleosynthesis redux
TL;DR: In this article, the abundances of the light elements were recalculated within the framework of primordial nucleosynthesis in the standard hot big band model, in order to estimate the primordial abundances.
Journal ArticleDOI
Big bang nucleosynthesis and physics beyond the standard model
TL;DR: In this article, the authors present a pedagogical account of relativistic cosmology and primordial nucleosynthesis, discussing both theoretical and observational aspects, and then proceed to examine such constraints in detail, in particular those pertaining to new massless particles and massive unstable particles.
Journal ArticleDOI
Big-bang nucleosynthesis and the baryon density of the universe.
TL;DR: The agreement between the predicted and observed abundances of deuterium, helium-3, helium -4, and lithium-7 confirms the standard cosmology model and allows accurate determination of the baryon density, which is pivotal to the establishment of two dark-matter problems.