Composite models for the narrow emission-line region of active galactic nuclei. VI. The Fe lines.
Abstract
The observed Fe lines from AGN raise a series of problems not easily solved by photoionization models. In our previous papers (Papers I to V) we have shown that composite models, which take into account the effect of shock hydrodynamics and photoionization, can successfully explain most of the observational features concerning the narrow emission line region of AGN. In this paper, the Fe lines are calculated by the composite models, and compared to observations. It is shown that the postshocked high temperature zone formed by compression is responsible for most of the [Fe VII] and [Fe X] line intensities. The theoretical values for [Fe II] 26 micron, [Fe III]4658, [Fe VII]6087 and [Fe X] 6374, relative to Hβ, are given for a different sets of the input parameters. It is shown that the observed Fe lines are better explained by an ejection case.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- May 1989
- Bibcode:
- 1989A&A...215..253V
- Keywords:
-
- Active Galactic Nuclei;
- Astronomical Models;
- Emission Spectra;
- Astronomical Spectroscopy;
- Iron;
- Particle Collisions;
- Photoionization;
- Spectral Line Width;
- Astrophysics