Mathematics – Logic
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11594o&link_type=abstract
HST Proposal ID #11594. Cycle 17
Mathematics
Logic
Scientific paper
We propose to conduct a spectroscopic survey of Lyman limit absorbers at redshifts 1.8 < z < 2.5, using WFC3 and the G280 grism. This proposal intends to complete an approved Cycle 15 SNAP program {#10878} which was cut short due to the ACS failure. We have selected 64 quasars at 2.3 < z < 2.6 from the Sloan Digital Sky Survey Spectroscopic Quasar sample, for which no BAL signature is found at the QSO redshift and no strong metal absorption lines are present at z > 2.3 along the lines of sight. The survey has three main observational goals. First, we will determine the redshift frequency dn/dz of the LLS over the column density range 16.0 < log{NHI} < 20.3 cm^-2. Second, we will measure the column density frequency distribution f{N} for the partial Lyman limit systems {PLLS} over the column density range 16.0 < log{NHI} < 17.5 cm^-2. Third, we will identify those sightlines which could provide a measurement of the primordial D/H ratio. By carrying out this survey, we can also help place meaningful constraints on two key quantities of cosmological relevance. First, we will estimate the amount of metals in the LLS using the f{N}, and ground based observations of metal line transitions. Second, by determining f{N} of the PLLS, we can constrain the amplitude of the ionizing UV background at z 2 to a greater precision. This survey is ideal for a snapshot observing program, because the on-object integration times are all well below 30 minutes, and follow-up observations from the ground require minimal telescope time due to the QSO sample being bright.;
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