Computer Science
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.3525b&link_type=abstract
HST Proposal ID #3525
Computer Science
Hst Proposal Id #3525
Scientific paper
We propose using the GHRS and ECH-B grating to observe bright (< 12.5 mag) supernovae which explode in external galaxies. The supernovae will serve as probes of the interstellar gas in the disk and halo, enabling us to search for Mg II and Mg I absorption lines arising from the host galaxy. The 6 km/s resolution of the echelle will allow us to resolve individual components which comprise the line. The accurate measurments of column densities & doppler parameters of each component and the large-scale multicomponent velocity structure of the lines will allow an unprecedented analysis of the chemical, ionization and kinematic conditions within the absorbing gas. For galaxies with low recession velocities, similar information may be obtained for local Milky Way absorption lines observed simultaneously. Because the galaxy which hosts the supernova will be obvious, the detected absorption can be compared with lines seen at higher redshifts in QSO spectra, providing an example of absorption from a KNOWN environment. A collation of all supernovae discovered over the last 10 years shows that roughly one supernova will be found during Cycle 2 with a magnitude brighter than our limit. We therefore request Target of Opportunity time to observe one supernova. Complementary observations of Ca II and Na I absorption will be made from ground-based telescopes.
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