Infrared lines from active galactic nuclei - A theoretical approach

Details Infrared lines from active galactic nuclei - A theoretical approach Infrared lines from active galactic nuclei - A theoretical approach

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...401..481c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 401, no. 2, p. 481-494.

Astronomy and Astrophysics

Astronomy

12

Active Galactic Nuclei, Astronomical Models, Infrared Spectra, Line Spectra, Active Galaxies, Emission Spectra, Forbidden Transitions, Infrared Sources (Astronomy), Near Infrared Radiation, Spectrum Analysis

Scientific paper

We present theoretical results of prominent IR lines from AGNs. Composite models, which account consistently for photoionization and shocks, are used. Our aim is to provide theoretical data in view of comparison with observations. Fine-structure IR line ratios and IR-to-optical line ratios, which depend on temperature and density, are analyzed. It is found that the different combination of the shock velocity and of the intensity of the central flux may change line ratios by large factors. Particularly in the ejection case, the low-ionization lines depend on the geometrical depth of the clouds, not only on the shock velocity, the intensity of photoionizing radiation, and on its high-energy cutoff.

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