Physics
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.4817b&link_type=abstract
HST Proposal ID #4817
Physics
Hst Proposal Id #4817
Scientific paper
The Quasar Absorption Line Survey of bright sources is an efficient observing program designed to provide a homogeneous data base of absorption features. The data will reveal absorption regions in galaxies, in clusters of galaxies, in voids, in large-scale structures, in Lyman ALPHA clouds, and wi provide information about damped Lyman ALPHA and Lyman-limit systems. The survey will determine, with high SNR, the profiles of > 200 emission lines. Using the estimated numbers of observed absorption lines, including archi val data, the program was designed to determine the cosmic evolution of absorption systems. High resolution spectra of a sample of quasars will be obtained with the FOS; the spectra will have a rest frame equivalent width detection limit for unresolved absorption lines of 0.3 A. The survey data base will address fundamental questions, for example: What is the strength and origin of the UV background radiation? How do gaseous galactic disks and halos evolve with redshift? What processes govern the ionization of absorbing gas? THIS SUBMISSION CONTAINS THE CYCLE 2 OBSERVATIONS OF OJ287 and PG1718+481.
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