Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...166...27c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 166, no. 1-2, Sept. 1986, p. 27-35.
Astronomy and Astrophysics
Astrophysics
84
Active Galactic Nuclei, Astronomical Models, Emission Spectra, Photoionization, Spectral Line Width, Balmer Series, H Beta Line, H I Regions, H Lines, Iron, Line Spectra, Magnesium, Paschen Series
Scientific paper
Current one-component models of the broad line region of quasars fail to explain the strength of low ionization lines. A two-component photoionization model where the high and low ionization lines are allowed to arise from different kinds of clouds is explored. A spectral distribution of the incident radiation which tends to overestimate the X-ray flux around 3 keV is adopted in order to enhance the extent and the heating of the excited H I region. After discussing the influence of several parameters, it is concluded that the model is still unable to explain the observed ratio Fe II/Hβ and that another kind of cloud, presumably not heated by photoionization, is needed to emit Fe II.
Collin-Souffrin Suzy
Dumont Serge
Joly Monique
Pequignot Daniel
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