English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present the first D/H measurement in a damped Ly-alpha system at z_abs =3.025 towards QSO 0347-3819 obtained from the UVES-VLT spectra. The DLAabsorber has a metallicity of [Zn/H] = -1.25 and a relatively simple velocitystructure, with two dominating components detected in several metal lines. Thehydrogen Lyman series can be followed down to Ly12 thanks to the high UV-Blueefficiency of UVES. The best fit of the Lyman series lines, and in particularof Ly5, Ly8, Ly10 and Ly12, relatively free of local contamination, is obtainedwhen the DI absorption is included in the two main components. The measureddeuterium column density yields D/H = (2.24+/-0.67) 10^{-5} close to other lowD/H values from Lyman limit systems. The corresponding values for the baryon tophoton ratio and the baryon density derived from D/H are eta = 6 10^{-10} andOmega_b h^2 = 0.023 respectively.Comment: 5 pages, 4 figures, Accepted for publication in A&A Letter

A new deuterium abundance measurement from a damped Lyα system at $\vec{z}_{\mathsf{abs}} =\mathsf{3.025}$