Near-pristine gas at high redshifts: a window on early nucleosynthesis
Max Pettini (Institute of Astronomy, University of Cambridge), Ryan, Cooke (Institute of Astronomy, University of Cambridge, Department of, Astronomy, Astrophysics, University of California, Santa Cruz)
TL;DR
This paper discusses a survey of extremely metal-poor damped Lyman alpha systems, providing insights into early universe nucleosynthesis, primordial element abundances, and the connection to ancient stars.
Contribution
It presents new observational data on the chemical composition of the most metal-poor DLAs, extending understanding of early nucleosynthesis and primordial element abundances.
Findings
Clarified issues regarding C, N, O abundances at low metallicity
Discovered DLA analogues to Carbon-enhanced metal-poor stars
Provided precise measurements of primordial Deuterium abundance
Abstract
It has now become recognised that damped Lyman alpha systems play an important role in helping us unravel the origin of chemical elements. In this presentation, we describe the main results of a recently completed survey of the most metal-poor DLAs, aimed at complementing and extending studies of the oldest stars in the Galaxy. The survey has clarified a number of lingering issues concerning the abundances of C, N, O in the low metallicity regime, has revealed the existence of DLA analogues to Carbon-enhanced metal-poor stars, and is providing some of the most precise measures of the primordial abundance of Deuterium.
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