Mathematics – Logic
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6619l&link_type=abstract
HST Proposal ID #6619
Mathematics
Logic
Hst Proposal Id #6619 Qso Absorption Lines
Scientific paper
Combining HST spectra of QSOs with ground-based spectroscopy of faint galaxies, we have been pursuing a program to directly identify the objects responsible for low- and intermediate- redshift QSO Ly-alpha absorption systems. Our results suggest that a significant fraction of intermediate-redshift Ly-alpha absorbers arise in very extended gaseous regions around galaxies. However, with existing ground-based images we are unable to clearly resolve the galaxies we identify. Thus we cannot tell how QSO absorption characteristics depend on galaxy morphological type, structural parameters, or angular inclinations and orientations. Here we propose to obtain high-resolution WFPC2 images of carefully selected fields centered on HST target QSOs. We will then have the exciting possibility of carrying out detailed studies of specific galaxies that are already known to be associated with specific QSO absorption systems. For the first time, it will be possible to learn how the QSO absorption characteristics relate to galaxy morphological type, what the gaseous geometry of those galaxies is, and how the inclination and orientation of the galaxy with respect to the QSO line of sight affect the absorption properties.
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