High-ionization nuclear emission-line region in the Seyfert galaxy Tololo 0109-383

Details High-ionization nuclear emission-line region in the Seyfert galaxy Tololo 0109-383 High-ionization nuclear emission-line region in the Seyfert galaxy Tololo 0109-383

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aj....115..460m&link_type=abstract

Astronomical Journal, vol. 115, p. 460

Astronomy and Astrophysics

Astronomy

26

Seyfert Galaxies, Galactic Nuclei, Ionization, H Alpha Line, Emission Spectra

Scientific paper

We present a detailed optical spectroscopic analysis of the high-ionization Seyfert galaxy Tololo 0109-383, which was classified originally as a type 2 Seyfert nucleus. The high-ionization nuclear emission-line region (HINER) of this galaxy is found to be spatially extended. Although the total radial extent of the HINER amounts to 1.1 kpc, 70 percent of the HINER emission is concentrated in the inner 220 pc in radius. The inner HINER in Tololo 0109-383 can be interpreted by the photoionization model of Ferguson et al. (1997), while the extended HINER suggests that low-density interstellar medium is also photoionized by high-energy continuum emission as described by Korista and Ferland (1989). We find an extended low-ionization emission line region traced by H, forbidden N II, and forbidden S II emission lines with very narrow widths at 2.2 kpc east of the nucleus. This region is characterized by (1) the observed forbidden N II/H ratio, which is 0.8; (2) no measurable forbidden O III emission; and (3) a low ionization parameter. These properties can also be interpreted in terms of a photoionization model. As well as confirmation of the presence of broad emission in both H-alpha and H-beta lines, we also find optical Fe II emission features in our spectra. Since the optical Fe II emission is one of the important characteristics of type 1 AGN, it is shown that Tololo 0109-383 harbors a type 1 central engine in its nucleus.

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