The nature of the ionizing source of the nuclear gas in NGC 1052

Details The nature of the ionizing source of the nuclear gas in NGC 1052 The nature of the ionizing source of the nuclear gas in NGC 1052

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...266l..89k&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 266, Mar. 15, 1983, p. L89-L92.

Astronomy and Astrophysics

Astrophysics

36

Cosmic Gases, Elliptical Galaxies, Galactic Nuclei, Gas Ionization, Oxygen Spectra, Shock Heating, Astronomical Models, Emission Spectra, Forbidden Bands, Gas Temperature, Ion Temperature, Line Spectra, Luminosity, Photoionization

Scientific paper

The ionization and physical state of the emission-line region in the nucleus of the elliptical galaxy NGC 1052 is examined. The forbidden O III 4363 A/5007 A ratio, frequently used as a diagnostic for ionization mechanisms, is very poorly determined because of difficulties in matching the underlying stellar continuum spectrum, which is unusual in having very strong lines for the galaxy luminosity. Within these limitations, forbidden O III temperature is found to be only marginally compatible with shock models, and the overall emission spectrum to be better fitted by photoionization models with a very dilute flat-spectrum central source. In any event, the case for NGC 1052 as a shock-heated nucleus is not strong.

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