The origin of the optical emission lines associated with extragalactic radio sources

Details The origin of the optical emission lines associated with extragalactic radio sources The origin of the optical emission lines associated with extragalactic radio sources

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...384..467v&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 384, Jan. 10, 1992, p. 467-473.

Astronomy and Astrophysics

Astronomy

18

Emission Spectra, Extragalactic Radio Sources, Line Spectra, Radio Jets (Astronomy), Star Formation, Abundance, Astronomical Models, Photoionization, Radio Astronomy

Scientific paper

The observed extended emission line regions (EELRs) associated with radio sources are investigated with the objective of determining the characteristics of the ionization mechanisms and the possible effect of star formation. The sources included in the sample are 3C 227, 3C 277.3, 3C 305, Cen A (NGC 5128), NGC 7385, PKS 0349-27, PKS 2152-69, and Minkowski's Object. It is shown that the emission-line ratios of the EELRs considered can be explained by models which account for the coupled effect of photoionization and shock acting at different degrees. It is also shown that the EELR ionization is not due to young stars. The main energy sources of the EELR are identified.

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