The ultraviolet spectra of radio-loud and radio-quiet quasars
Date
1993
Authors
Francis, Paul
Hooper, Eric J.
Impey, Chris D.
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American Astronomical Society
Abstract
The rest-frame ultraviolet spectral properties of matched samples of radio-loud, radio-moderate, and
radio-quiet quasars are investigated, using quasars drawn from the Large Bright QSO Survey. We
confirm the absence of spectral differences between radio-loud and radio-quiet quasars at rest-frame
wavelengths longward of 1600 Á, as reported by previous authors. However, at shorter wavelengths we
find a significant difference: radio-loud quasars have narrower (96% confidence), higher
equivalent-width (97% confidence) Lyman-a and C IV emission lines. We further investigate quasars
which are radio quiet, but have radio-to-optical flux ratios at the upper extreme of the radio-quiet
population. Broad absorption line quasars are overabundant by a factor of —10 in this radio-moderate
population; the overabundance is significant at a 99.99% confidence level.
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The Astronomical Journal
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Journal article
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Open Access
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