The excitation mechanisms of metastable levels and variability of forbidden O III 4959 and 5007 A lines in the spectra of nuclei of Seyfert galaxies

Details The excitation mechanisms of metastable levels and variability of forbidden O III 4959 and 5007 A lines in the spectra of nuclei of Seyfert galaxies The excitation mechanisms of metastable levels and variability of forbidden O III 4959 and 5007 A lines in the spectra of nuclei of Seyfert galaxies

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988azh....65..478p&link_type=abstract

Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 65, May-June 1988, p. 478-487. In Russian.

Astronomy and Astrophysics

Astronomy

2

Astronomical Spectroscopy, Galactic Nuclei, Metastable State, Oxygen Spectra, Seyfert Galaxies, Forbidden Bands, Hydrogen Clouds, Line Spectra, Oxygen Ions

Scientific paper

The possible excitation mechanisms of the metastable levels 2p2 1D2 and 2p2 1S0 of the ions [O III] in gaseous envelopes of Seyfert galaxies' nuclei are considered. It is shown that in a high-density gas, n(H) ⪆ 107cm-3, Auger's effect and charge transfer O IV+H I → O III+H II provide the high emissivity of the gas in the [O III] lines only by the low hydrogen and helium ionization, when ne ≡ n(O III) ≡ 105 - 106cm-3. Such situation is possible in H I regions where oxygen is ionized by soft X-rays (Auger's effect). The estimates show that the observed luminosities of the NGC 1275 galaxy nucleus in the 4959+5007 Å [O III] lines can be explained in a gas with hydrogen concentration n(H) ≡ 108cm-3 and do not contradict to the possible variability of the lines at a timescale of a month.

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