5791( 0) - 07/18/95 18:00 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 5791 Version: ********** Check-in Date: ********** 1.Proposal Title: Quasar Environments and Associated C IV Absorption ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle Quasars AR 5 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Erica Ellingson Dept. of Astronomy, New Mexico State University CoI: John Stocke Center for Astrophysics and Space N Astronomy, U. Colorado CoI: Howard Yee Dept. of Astronomy, U. Toronto N CoI: Jill Bechtold Steward Obs., U. Arizona N ------------------------------------------------------------------------------------ 6. Abstract We propose to use HST FOS UV spectra of quasars with z < 1.0 to investigate the nature of associated (z_abs ~ z_em) C IV absorption line systems. These systems, which are often seen in the optical spectra of radio-loud quasars at z ~ 1.5, may be caused by the halos of galaxies in a cluster around the quasars, or may be intrinsic to the quasar itself. We will test these scenarios by comparing the incidence of associated absorption with our extensive imaging and spectroscopic observations of galaxies associated with quasars. Previous results suggest that if the galaxy halo scenario is true, then cluster galaxy halos may have undergone significant evolution since z ~ 1.5. Analysis of these new archival data will allow us to determine whether this is the case, and if so, study the evolution of galaxy halos in different environments for the first time. ------------------------------------------------------------------------------------ Observations Description ------------------------ Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 5791( 0) - 07/18/95 18:00 - [ 2] Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address Ship Via: UPS Email: , ------------------------------------------------------------------------------------ 5791( 0) - 07/18/95 18:00 - [ 3] Summary Form for Proposal 5791 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category AR ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category Quasars ------------------------------------------------------------------------------------------------------------------------------------