Physics
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5961w&link_type=abstract
HST Proposal ID #5961
Physics
Hst Proposal Id #5961 Quasars
Scientific paper
In Cycle 4 we obtained spectra of selected wavelength regions towards the z(em)=0.534, m(u)=15.5 QSO 0454-220. The goal was to derive the deuterium abundance in a known intervening absorption system at z(abs)=0.48. The Cycle 4 data have resulted in the discovery of a double absorption system at z(abs)=0.483137 and z(abs)=0.482279. By a stroke of good fortune, the characteristics of this double system are better than we could have hoped for: (1) the velocity splitting is 174 km/s, sufficiently well separated to estimate D/H in both systems simultaneously, (2) N(HI) and b in both clouds are suitable for measuring D/H, (3), the D absorption is strongest at LyAlpha, which happens to be well placed in efficiency for the G200M grating. Our Cycle 4 data cover the higher order Lyman lines, and existing FOS data covers the Lyman limit, so we already have tight constraints on N(HI) in both clouds. We now need observations of the LyAlpha line to combine with the Cycle 4 data and derive the first D/H estimates at these redshifts.
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