caa a22 4500 469076550 CHVBK 20180323132936.0 cr unu---uuuuu 170328e19921101xx s 000 0 eng 10.1007/BF02506692 doi (NATIONALLICENCE)springer-10.1007/BF02506692 ISO spectroscopy: the study of active galaxies [Elektronische Daten] [L. Spinoglio, P. Cerulli-Irelli, R. Orfei, M. Malkan] 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. Società Italiana di Fisica, 1992 98.50 nationallicence Galaxies, extragalactic objects and systems (by type) nationallicence 95.55 nationallicence Astronomical space instrumentation nationallicence Spinoglio L. Istituto di Fisica dello Spazio Interplanetario, CP. 27, 00044, Frascati, Italy aut Cerulli-Irelli P. Istituto di Fisica dello Spazio Interplanetario, CP. 27, 00044, Frascati, Italy aut Orfei R. Istituto di Fisica dello Spazio Interplanetario, CP. 27, 00044, Frascati, Italy aut Malkan M. Department of Astronomy, University of California, 90024-1562, Los Angeles, CA, USA aut Il Nuovo Cimento C Società Italiana di Fisica 15/6(1992-11-01), 1013-1020 0390-5551 15:6<1013 1992 15 11543 https://doi.org/10.1007/BF02506692 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02506692 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Spinoglio L. Istituto di Fisica dello Spazio Interplanetario, CP. 27, 00044, Frascati, Italy aut NATIONALLICENCE 700 1- Cerulli-Irelli P. Istituto di Fisica dello Spazio Interplanetario, CP. 27, 00044, Frascati, Italy aut NATIONALLICENCE 700 1- Orfei R. Istituto di Fisica dello Spazio Interplanetario, CP. 27, 00044, Frascati, Italy aut NATIONALLICENCE 700 1- Malkan M. Department of Astronomy, University of California, 90024-1562, Los Angeles, CA, USA aut NATIONALLICENCE 773 0- Il Nuovo Cimento C Società Italiana di Fisica 15/6(1992-11-01), 1013-1020 0390-5551 15:6<1013 1992 15 11543 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer