The ionization mechanism in low level emission galaxy nuclei - Shocks

Details The ionization mechanism in low level emission galaxy nuclei - Shocks The ionization mechanism in low level emission galaxy nuclei - Shocks

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ap%26ss.157..153b&link_type=abstract

(Instituto de Astrofisica de Canarias and Comision Interministerial de Ciencia y Tecnologia, Summer School on Evolutionary Pheno

Astronomy and Astrophysics

Astrophysics

Galactic Nuclei, Ionization, Shock Heating, Forbidden Transitions, Hot Stars, Photoionization

Scientific paper

The emission component of galaxy nuclei at very low intensity levels is analyzed. This emission level is considerably lower than that of classical LINERS like NGC 1052. Access to weaker emission lines by averaging spectra with similar line ratios for H-alpha, forbidden N II and forbidden SII is available. From the resulting spectrum for very low level emission nuclei, the forbidden S II, 6717, 6731A, forbidden SIII, 9069, 9532A line ratio criterion (Diaz et al. 1985a) unambiguously shows that shock-wave heating is the mechanism responsible for the ionization in such objects.

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