Computer Science
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4525b&link_type=abstract
HST Proposal ID #4525
Computer Science
Hst Proposal Id #4525
Scientific paper
We wish to examine the hypothesis that low-redshift galaxies are surrounded by extended gaseous haloes and disks. Specifically, we propose using the GHRS to search for Mg II or C IV absorption lines in the haloes of four low-redshift galaxies lying fortuitously in front of background quasars. We aim to reach sensitive equivalent widths limits of 60 mA and 40 mA (2 sigma) for each of the ions, and hence to infer the chemical, ionization and kinematic conditions withi n the absorbing gas by accurately measuring column densities, doppler parameters, and the large-scale multicomponent structure of the lines. Comparisons of the absorption in nearby galaxies with the lines seen at higher redshifts in QSO spectra should help settle the issue of how the metal-line systems originate. Our recent Cycle 1 discovery of MgII and C~IV absorption in the spectrum of Mrk~205 from the intervening galaxy NGC~4319 demonstrates that the technique is a powerful tool for investigating the interstellar medium of intervening galaxies and provides a stimulating comparision to the systems seen at higher redshifts. We were allocated 20 hours in Cycle 1, and 15 hours in Cycle 2. We now wish to conclude our GHRS survey in cycle 3.
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