Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...240..247b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 240, no. 2, Dec. 1990, p. 247-253.
Astronomy and Astrophysics
Astrophysics
8
Active Galactic Nuclei, Carbon, Lyman Alpha Radiation, Quasars, Red Shift, Astronomical Spectroscopy, Emission Spectra, Iue, Seyfert Galaxies, Spectral Line Width
Scientific paper
Using high-quality spectra obtained from the IUE Uniform Low Dispersion Archives, the profiles of the Ly-alpha and C IV emission lines in ten active quasars/Seyfert 1 galaxies with z values between 0.05 and 0.2 were investigated. Results of modeling Ly-alpha and C IV lines with two Gaussian components show that the line intensity ratio C(IV)/Ly-alpha is often larger in the fast moving gas producing the wings than it is at the line center. The C IV lines showed no pronounced asymmetry, and the Ly-alpha lines exhibited no systematic shift. The Ly-alpha lines were symmetrical and tended to have a stronger narrow component than had the C IV line, indicating that the ionization parameter is larger in the fast moving gas than it is in the lower velocity gas emitting the core of the lines.
Buson Lucio Maria
Ulrich Marie-Helene
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