Query : 2001A&A...376..751P

2001A&A...376..751P - Astronomy and Astrophysics, volume 376, 751-755 (2001/9-4)

Deuterium at high redshift: Primordial or evolved?


Abstract (from CDS):

On the basis of arguments from galactic chemical evolution we suggest that the recent observations of D/H vs. metallicity in several high redshift absorbers are best understood if the primordial D value is in the range DP/H∼2-3x10–5. This range points to a rather high baryonic density (ΩBh2=0.019-0.026) compatible to the one obtained by recent estimates based on the Cosmic Microwave Background (CMB) anisotropy measurements. Slightly higher values (D/H∼4x10–5) 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.

Abstract Copyright:

Journal keyword(s): cosmology - galaxies: abundances - galaxies: evolution

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
1 QSO B0105+1619 QSO 01 08 06.4232933125 +16 35 49.965044810   16.9       ~ 54 0
2 QSO B2206-197 SyG 22 09 23.49 -19 32 34.9   19.7       ~ 7 0

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