2001/06/27 by Nikos Prantzos, N. Prantzos, Yuhri Ishimaru +1
Physics and Astronomy · #Astrophysics and Star Formation Studies #Scientific Research and Discoveries #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1051/0004-6361:20010861
5 pages, 3 figures, A&A in press
arxiv created 2001/06/27 · openalex publication_date 2001/09/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/31
On the basis of arguments from galactic chemical evolution we suggest that the recent observations of vs. metallicity in several high redshift absorbers are best understood if the primordial D value is in the range . This range points to a rather high baryonic density () compatible to the one obtained by recent estimates based on the Cosmic Microwave Background (CMB) anisotropy measurements. Slightly higher values () are found in Lyman limit systems. Such values are still compatible with CMB estimates but, if taken at face value, suggest a trend of decreasing D abundance with metallicity. We argue that special assumptions, like differential enrichment, are required to explain the data in that case. A clear test of such a differential enrichment would be an excess of products of low mass stars like C and/or N in those systems, but currently available data of N/Si in DLAs do not favour such a "non-standard" scenario.