Confrontation of a sample of Seyfert 2 galaxies with photoionized models

Details Confrontation of a sample of Seyfert 2 galaxies with photoionized models Confrontation of a sample of Seyfert 2 galaxies with photoionized models

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...135..341s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 135, no. 2, June 1984, p. 341-355. Research supported by the Centre National d

Astronomy and Astrophysics

Astrophysics

84

Abundance, Galactic Nuclei, Line Spectra, Photoionization, Radiative Transfer, Seyfert Galaxies, Gas Density, Helium, Neon, Nitrogen, Oxygen, Sulfur

Scientific paper

The author presents a series of diagrams in which different line intensity ratios are plotted for a sample of Seyfert 2 galaxies. Superimposed are the results of photoionized models exploring a wide range of ionizing spectra, ionization parameters U, gas densities and elemental abundances. It appears that Seyfert 2 nuclei contain one system of high density clouds (n > 106cm-3) with roughly same U for all the objects, and one system of lower density clouds (n < 104cm-3) for which U varies from one object to another, leading to the observed differences in [O III]/[O II] among the objects. Besides, it seems that the size of the emitting clouds in "low-excitation" nuclei is smaller than in the "high-excitation" ones. A few problems remain: the predicted [O II] intensities are slightly too strong compared to observations, the [N I]/[N II] ratio is too large to be accounted for by any model. Finally, models cannot reproduce the very important scatter in the observed He I/Hβ ratios.

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