The high-ionization optical spectrum of the Seyfert galaxy Tololo 0109-383

Details The high-ionization optical spectrum of the Seyfert galaxy Tololo 0109-383 The high-ionization optical spectrum of the Seyfert galaxy Tololo 0109-383

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.204.1231f&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 204, Sept. 1983, p. 1231-1236.

Astronomy and Astrophysics

Astronomy

28

Astronomical Spectroscopy, Galactic Nuclei, Gas Ionization, Optical Emission Spectroscopy, Seyfert Galaxies, Electron Density (Concentration), Forbidden Transitions, H Beta Line, Ion Temperature, Photoionization

Scientific paper

Optical emission line intensity measurements are presented of the high-ionization Seyfert galaxy T 0109-383. Using the transauroral to nebular ratios of [0 II] and [S II], the extinction to the forbidden line region is found to be AV = 1.6 mag. The reddening corrected [Fe VII] spectrum indicates a temperature and an electron density in the high-ionization zone of <3.5×104K and 2×106 cm-3 respectively. While this supports the notion that the higher ions are photoionized in Seyfert galaxies, a significantly higher assumed value of the extinction (AV > 2 mag) to the high-ionization zone would be consistent with an [Fe VII] temperature of≡105K and collisional ionization.

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