Physics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9189b&link_type=abstract
HST Proposal ID #9189
Physics
Hst Proposal Id #9189 Agn/Quasars
Scientific paper
A quasar's emission line spectrum appears to be the result of two, possibly correlated quantities - the continuum SED at ionizing energies and the gas metallicity {Korista et al. 1998}. Both are important on their own - the continuum shape for the central object physics and effects on ionization of the IGM, and the metallicity for telling us about the early evolution of massive galaxies. This proposal builds on each by extending the observed line and continuum data base to well below LyAlpha, which will greatly improve our ability to measure the ionizing continuum shape and metallicity on an object-by-object basis. As an initial step, we wish to sort through the 650 QSO spectra in the HST archives that cover the 600-1000Angstrom region, and see how good a sample can be assembled with a minimum of new HST observations. Direct observation shows that the observed continuum is not sufficient to power the clouds. We will use these new lines to develop the emission line indicators that will measure what continuum the clouds do see, and to critically test the reliabilty of our proposed metallicity indicators. This will result in major improvements of our understanding of the inner environment of a quasar by measuring both the continuum shape and metallicity, and is a necessary step to being able to use quasars as probes of the high redshift universe.
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