Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...226...23b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 226, no. 1, Dec. 1989, p. 23-44.
Astronomy and Astrophysics
Astrophysics
49
Abundance, Active Galactic Nuclei, Galactic Radiation, Interstellar Matter, Ionized Gases, Line Spectra, Emission Spectra, Spectrum Analysis, Statistical Analysis
Scientific paper
The emission-line component in a sample of 92 galaxies was isolated using stellar absorption templates built from emission-free star cluster spectra and taking into account all sources of reddening extrinsic to the line emitting regions, and the emission line properties were statistically analyzed. Three characteristic average spectra were built, including those corresponding to nuclear H II regions, objects identified as LINERs, and extreme low-level emission galaxies with W(em) of not greater than 2 A. For the latter, line measurements were pushed down to very low level. The measurements of the ratio between forbidden S II line and forbidden S III line indicate that, in the extreme low-level emission galaxies, the shock ionization is the mechanism at work.
Alloin Danielle
Bica Eduardo
Bonatto Ch.
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