Formation of permitted lines in the spectrum of type 1 Seyfert galaxies and quasars - Fe II lines, preliminary discussion

Details Formation of permitted lines in the spectrum of type 1 Seyfert galaxies and quasars - Fe II lines, preliminary discussion Formation of permitted lines in the spectrum of type 1 Seyfert galaxies and quasars - Fe II lines, preliminary discussion

Feb 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....72..293c&link_type=abstract

Astronomy and Astrophysics, vol. 72, no. 3, Feb. 1979, p. 293-308.

Astronomy and Astrophysics

Astrophysics

46

Iron, Photoionization, Quasars, Seyfert Galaxies, Spectrum Analysis, Astronomical Models, Balmer Series, Electron Transitions, H Ii Regions, Metal Ions, Radiative Recombination, Tables (Data)

Scientific paper

The formation of permitted Fe II lines in type 1 Seyfert galaxies and quasars is investigated in the framework of a classical photoionization model where the Fe II lines are excited at least partly by a fluorescence mechanism. It is assumed that the Fe II emission region is a transition zone without Lyman continuum photons that surrounds the H II region responsible for the broad Balmer lines. The models, methods, and atomic data used in the analysis are described in detail, and results are obtained for a four-level atom. The dominant excitation process is considered, line profiles are discussed, and a model without a central continuum source that excites the Fe II region is tentatively adopted. It is concluded that the Fe II region is probably heated, excited, and ionized by a thermal process.

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