Mathematics – Logic
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6557s&link_type=abstract
HST Proposal ID #6557
Mathematics
Logic
Hst Proposal Id #6557 Qso Absorption Lines
Scientific paper
We propose to continue using WFPC2 to obtain high resolution images of 0.3 <= z <= 1.0 galaxies taken from a survey selected by diffuse gas cross-section rather than apparent magnitude. The implications of our survey are that large, roughly spherical gaseous halos are a generic property of all relatively massive {L_K > 0.05L_K^* }galaxies, and that the nature of these envelopes is more closely related to galaxy mass than to current star formation rate or spectroscopic type. The aim of our proposed observations is to use a representative subset of our sample in order 1} to test directly whether the absorbers represent the full range in normal Hubble sequence morphological types {as suggested by the ground-based spectra and colors} 2} to confirm whether the statistical inference of roughly spherical gas distributions is correct by examining whether, e.g., galaxy inclination angle is related to the nature of the absorption, 3} to verify that the galaxies identified as the absorbers are indeed the most likely candidates by searching for previously undetected faint companions very near the QSO line of sight, and 4} to obtain crucial morphological and sky-orientation information that can be combined with our existing ground- based data and with planned high resolution spectroscopy of the background QSOs to obtain a complete picture of the interrelationship between morphological type, impact parameter, star formation rate, and the gas-phase geometry, kinematics, physical conditions, and chemical abundances.
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