Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106..417f&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 106, no. 2, p. 417-425.
Astronomy and Astrophysics
Astronomy
68
Absorption Spectra, Lyman Alpha Radiation, Quasars, Radio Emission, Ultraviolet Spectra, Very Large Array (Vla), Emission Spectra, Spectral Line Width
Scientific paper
The rest-frame UV 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 A, as reported by previous authors. However, at shorter wavelengths we find a significant difference: radio-loud quasars have narrower (96 percent confidence), higher equivalent-width (97 percent confidence) Lyman-alpha 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 about 10 in this radio-moderate population; the overabundance is significant at a 99.99 percent confidence level.
Francis Paul J.
Hooper Eric J.
Impey Chris David
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