Physics
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5506w&link_type=abstract
HST Proposal ID #5506
Physics
Hst Proposal Id #5506 Quasars &Amp, Agn Quasar Absorption
Scientific paper
Observations of the light element abundances play a fundamental role in our undertanding of the standard homogenous big bang model. Of all the light elements, deuterium is of particular importance as the predicted abundance depends most sensitively on the universal density parameter. Since deuterium is readlily destroyed in stellar cycles, but manufactured only in the big bang, any deuterium detected is generally interpreted as being of primordial origin. Whilst important progress has been made with Galactic observations, extragalactic observations of highly redshifted QSO absorption systems are imperative as the offer the chance of measuring D/H in gaseous systems at a much earlier epoch with a range of metal abundances. These have been attempted, but so far no successful measurements have been made, partly due to difficulties associated with making the measurement at high redshift. For the first time we now have the possibility of measuring D/H moderate redshift (z=0.5 - 1) QSO absorption systems using GHRS on HST. We have selected 1 bright QSO with a foreground absorber which is an excellent candidate for making this fundamental measurement.
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