Mathematics – Logic
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.4000b&link_type=abstract
HST Proposal ID #4000
Mathematics
Logic
Hst Proposal Id #4000 Quasars &Amp, Agn
Scientific paper
The establishment of a homogeneous data base of quasar absorption lines using the diagnostic survey proposed here will form the basis for an attack on fundamental cosmological and astrophysical problems: What are the physical, dynamical and evolutionary properties of the intergalactic medium? What is the strength, shape and origin of the UV background radiation? What limits can be set upon the primordial He/H and D/H ratios? What has been the chemical and dynamical evolution of gaseous galactic disks and halos? What physical processes govern the ionization of this gas? What physical processes govern the acceleration of thermal and relativistic plasma in radio quiet and radio loud quasars? How has gaseous structure in the universe evolved on scales of 1 Mpc to 100 Mpc? The discrimatory power of the survey and the efficient use of HST were the primary criteria used in constructing the survey, which takes account of all relevant GTO observations. Exposure times are based upon IUE archival data. Ground-based observations of all program objects will be made to monitor variability and to complement the HST observations. The survey contains a primary list of 103 quasars with 0.3 < Z_em < 2.0, 18 additional bright quasars to be observed with the FOS to provide candidates for future HRS follow up, and a supplementary list of 49 fainter quasars for a damped Ly-alpha survey. A plausible extrapolation of ground-based data suggests that the primary survey will detect 275 Ly-alpha and 60 CIV systems.
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