Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...177...11b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 177, no. 1-2, May 1987, p. 11-21.
Astronomy and Astrophysics
Astrophysics
26
Active Galaxies, Galactic Nuclei, Interstellar Matter, Nebulae, Quasars, Active Galactic Nuclei, Helium, Line Spectra, Nitrogen, Oxygen, Photoionization, Silicon
Scientific paper
The possibility that quasars or luminous active galactic nuclei may leave behind in the outskirts of their host galaxies fossil nebulae with an ionization state inconsistent with the residual luminosity of the dormant nucleus is investigated. The evolution of the ionization structure and integrated line emissivities of a low-density plane-parallel cloud following a large decrease in the ionizing photon flux is studied using a time-dependent photoionization model. Results indicate that, for the case of the bright, high-ionization emission-line regions recently observed surrounding several radio galaxies, the strength found for the forbidden O III line rules out the fossil-nebula interpretation for the simple single-cloud models considered.
Binette Luc
Robinson Alan
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