Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993egte.conf..336v&link_type=abstract
In NASA. Ames Research Center, The Evolution of Galaxies and Their Environment p 336-337 (SEE N93-26706 10-90)
Astronomy and Astrophysics
Astronomy
Active Galactic Nuclei, Active Galaxies, Cosmic Dust, Far Infrared Radiation, Fine Structure, Interstellar Matter, Molecular Clouds, Astronomical Spectroscopy, Infrared Astronomy Satellite, Luminosity, Molecular Gases, Photoionization
Scientific paper
Far-infrared spectroscopy of celestial objects will improve dramatically in the coming decade, allowing astronomers to use fine-structure line emission to probe photoionized regions obscured in the optical band by thick clouds of dust. The ultraluminous far-IR galaxies revealed by IRAS, quasar-like in luminosity but smothered in molecular gas, probably conceal either immense starbursts or luminous active nuclei. In both scenarios, these objects ought to produce copious infrared fine-structure emission with several lines comparable to H(beta) in luminosity. This paper shows how these lines, if detected, can be used to determine the electron densities and far-IR obscurations of shrouded photoionized regions and to constrain the shape and ionization parameter of the ionizing spectra. The presence of (Ne V) emission in particular will distinguish shrouded AGN's from shrouded starbursts. Since all active galaxies photoionize at least some surrounding material, these diagnostics can also be applied to active galaxies in general and will aid in studying how an active nucleus interacts with the interstellar medium of its host galaxy.
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