Emission-line activity in radio galaxies

Details Emission-line activity in radio galaxies Emission-line activity in radio galaxies

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.227...97r&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 227, July 1, 1987, p. 97-114.

Astronomy and Astrophysics

Astronomy

136

Astronomical Models, Emission Spectra, Ionized Gases, Photoionization, Radio Galaxies, Spectral Line Width, Black Body Radiation, Galactic Nuclei, Gas Cooling, Gas Ionization, H Beta Line

Scientific paper

Line ratio diagnostic diagrams are used in conjunction with a grid of photoionization models to study the emission-line spectra of a number of extended nebulosities associated with radio galaxies which have prominent nuclear narrow emission-line regions. In these diagrams, the extended emission-line regions (EELR) form well-defined trends with the forbidden O I/forbidden O III ratio which are naturally explained if the EELR are photoionized by moderately hard ionizing continua but have a range of ionization parameters. The ionizing spectra are characterized by mean photon energies in the range 30-40 eV; photoionization by normal stars can be ruled out. Remarkably, the corresponding nuclear emission-line regions fall on or very close to the trends defined by the EELR. Possible explanations for these findings are discussed.

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