A Lyman Limit snapshot survey: the search for candidate D/H absorbers

Details A Lyman Limit snapshot survey: the search for candidate D/H absorbers A Lyman Limit snapshot survey: the search for candidate D/H absorbers

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9187w&link_type=abstract

HST Proposal ID #9187

Mathematics

Logic

Hst Proposal Id #9187 Quasar Absorption Lines And Igm

Scientific paper

Measuring D/H in gas clouds seen against background QSOs provides a unique and fundamental cosmological probe of the baryonic density parameter. To date, most of the QSO absorption line D/H constraints have been derived at high redshift. In this proposal we wish to investigate a lower redshift range, because there are two potentially crucial advantages to be gained by carrying out D/H measurements at intermediate redshift. First, the background of HI forest lines is lower and contamination of the DI feature is significantly reduced. Second, a far larger sample of very bright QSOs exists. A large sample is important since a reliable determination of the primordial D/H requires a statistical approach. The spectra we obtain will be carefully analyzed to select absorption systems with simple velocity structure, which are suitable for measuring D/H.

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