The LINERs revisited

Details The LINERs revisited The LINERs revisited

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...360..474v&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 360, Sept. 10, 1990, p. 474-482.

Astronomy and Astrophysics

Astrophysics

21

Emission Spectra, Galactic Nuclei, Photoionization, Black Body Radiation, Forbidden Transitions, Line Spectra, Optical Thickness, Relativistic Electron Beams

Scientific paper

The present consideration of the source of energy of low-ionization nuclear emission-line regions (LINERs) proceeds by analyzing a large sample of objects; the emission line ratios thus obtained are compared to theoretical values from photoionization models, which either include or exclude the effect of relativistic electrons, and from shock models. It is found that the standard, optically thick photoionization models cannot describe the entire range of observed line ratios, even in the case where clouds of different densities are present. A more accurate characterization of LINERs must encompass the distribution of shocks and/or relativistic particles.

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