Mathematics – Logic
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983liaco..24..611t&link_type=abstract
IN: Quasars and gravitational lenses; Proceedings of the Twenty-fourth Liege International Astrophysical Colloquium, Cointe-Ougr
Mathematics
Logic
Absorption Spectra, Astronomical Spectroscopy, Emission Spectra, Quasars, Flow Velocity, Mass Flow Rate, Spectral Line Width, Stellar Mass Ejection
Scientific paper
It is pointed out that approximately 3 to 10 percent of QSO spectra exhibit high ionization broad absorption lines (BALs) of C IV, Si IV, N V, and O VI. The present investigation is concerned with the BAL-emission line properties of QSOs. The systematics of BAL and non-BAL QSO spectra are discussed, taking into account L-alpha emission, N V emission, C IV emission, C III semi-forbidden line emission, Mg II emission, and the correlation between the BAL profile and the corresponding emission line. The main aim in the investigation is related to an illustration of the interesting spectroscopic differences which are apparent when it is tried to compare the known BAL QSOs to samples of non-BAL QSOs. Attention is given to aspect angle effects, true morphological differences, and selection effects.
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