Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.201..645w&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 201, Nov. 1982, p. 645-660. Research supported by the Science and Engin
Astronomy and Astrophysics
Astronomy
71
Emission Spectra, Line Spectra, Lyman Alpha Radiation, Quasars, Stellar Spectra, High Resolution, Red Shift, Spectrum Analysis
Scientific paper
High-resolution spectra of six high-reshift QSOs were utilized in a study of the profile of the Lyman-alpha wavelength 1215.67 A emission line. The symmetry of the profile was studied after removing any absorption lines, which are mostly resolved at this resolution and after subtraction of N V wavelength 1240 and Si II 1263 emission from the observed blend. With one exception, Q2204-408, the Lyman-alpha profiles are symmetric to within the uncertainties of the procedure. It also became clear during the analysis that the profiles of the emission lines are not identical, in particular C IV wavelength 1549 generally has weaker wings and peak than Lyman-alpha wavelength 1216. It is argued that either the motion of the broad-line region gas is not purely radial, or else most of the Lyman-alpha photons originate in optically thin gas. Further implication of these results are discussed
Carswell Robert F.
Wilkes Belinda J.
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