Mathematics – Logic
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5948l&link_type=abstract
HST Proposal ID #5948
Mathematics
Logic
Hst Proposal Id #5948 Quasars
Scientific paper
We will obtain intermediate-resolution spectroscopy of nine moderate-redshift (0.05 < z < 1.6) candidate damped Ly-alpha absorption features that were detected toward higher-redshift background QSOs in an exhaustive search of the IUE archival data base. This search forms a systematic, unbiased survey for moderate-redshift damped Ly-alpha absorbers. Accurate spectra of the candidate features will allow us to confirm (or otherwise) the damped nature of the absorption profiles and to determine the H I column densities. By combining the results of this ultraviolet survey with those derived from existing optical surveys we will determine the redshift evolution of the rate of incidence, cosmological mass density, and column density distribution of damped Ly-alpha absorbers over a redshift baseline spanning 0.05 < z < 4.0. We will furthermore secure a sample of moderate-redshift damped Ly- alpha absorbers for further detailed study. These results will constrain theories of galaxy formation and evolution and will help to determine the type or types of galaxies responsible for the absorption. This proposal was awarded medium priority status in Cycle 3 but was not completed due to the short duration of Cycle 3.
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