ISO spectroscopy: the study of active galaxies |
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Authors: | L Spinoglio P Cerulli-Irelli R Orfei and M A Malkan |
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Institution: | (1) Istituto di Fisica dello Spazio Interplanetario, CP. 27, 00044 Frascati, Italy;(2) Department of Astronomy, University of California, 90024-1562 Los Angeles, CA, U.S.A. |
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Abstract: | Summary Infrared spectroscopy can greatly help in the understanding of the active galaxies phenomena, having the advantage over optical
and UV spectroscopy of penetrating those nuclei heavily obscured by absorbing dust. The standard photoionization code CLOUDY
by Ferland has been used to predict the intensities of the infrared ionic fine-structure lines. Examples of line ratio diagrams
are presented which constrain the two main free parameters of the models (gas density and ionization parameter), and separate
line emission in the different regions of active galaxies (Seyfert and LINER type nuclei, coronal emission region, starbursts).
Moreover, some line ratio diagrams can disentangle emission-line components from shock excited and photodissociated gas. Finally
we show that the observations of these infrared lines will be possible in the near future with the ISO (Infrared Space Observatory)
spectrometers.
Paper presented at the V Cosmic Physics National Conference, S. Miniato, November 27–30, 1990. |
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Keywords: | Galaxies extragalactic objects and systems (by type) PACS 95 55 Astronomical space instrumentation |
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