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Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5796g&link_type=abstract
HST Proposal ID #5796
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Hst Proposal Id #5796 Quasars
Scientific paper
We propose to study the emission line profiles of all high quality, low to intermediate redshift quasars in the HST archive. This sample now makes it possible to do detailed analyses using both optical and UV spectra in the same objects. We will deblend lines and construct line profile ratios to determine line intensity ratios as a function of velocity. This will permit a photoionization analysis of the emitting regions as a function of velocity rather than from much less meaningful integrated fluxes. The high ionization blue-shifting effect will be studied, taking advantage of the knowledge of the true rest frame redshift of the quasar gained from the optical lines. Among other things, we are particularly interested in the physical properties of the region producing the highest ionization lines and the degree to which the UV line producing clouds are optically thin. We will be performing two types of principal component analysis {PCA} on the HST spectra, a parametrized PCA and an unparametrized PCA to investigate object to object variations and their causes. We will be seeking particularly to verify our proposed connection between the main optical and UV principal components and the physical interpretation of some components. We will attempt to derive the reddening of the BLR from line ratios and derive de-reddened line profile ratios. We will investigate abundances using information from both the UV lines and from the optical narrow lines {NLR} and investigate the correlation between the two.
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