Physics
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5820w&link_type=abstract
HST Proposal ID #5820
Physics
Hst Proposal Id #5820 Quasars
Scientific paper
Our recent discovery of highly significant differences between the broad emission line spectra of radio-quiet and radio-loud quasars may finally lead to the solution of the long-standing puzzle of why just some QSOs {about 10 powerful radio- emitters. Radio emission is clearly associated with low- velocity gas and the red wings that are prominent in the broad lines of C IV Lambda1549 and H Beta. The most extreme red wings occur in core-dominant quasars, suggesting axial jet flow. Low velocity BLR gas is related to strong NLR emission, weak optical Fe II emission, and a strong hard X-ray continuum. All good HST spectra for > 100 radio-loud quasars with z < 1.2 will be used, with ground-based spectra, to relate line profile components to radio core- and lobe luminosity, the core-to-lobe ratio {an orientation indicator}, and X-ray luminosity and spectral index. We propose to combine conventional profile analyses with the newly-applied technique of `spectral' principal component analysis {PCA}. This powerful linear correlation technique allows line components to be distinguished based on their correlated inter -spectrum variations. Because it uses differences among spectra it does not depend on subjective continuum placement or unphysical line-profile parameterization, so that the signal-to-noise ratio in `principal component spectra' can be vastly improved by increasing the number of spectra, thereby sampling an increasing range of spectral properties.
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