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Excitation Mechanism of Extended Emission-Line Regions in Active Galaxies

  • Ian Evans (a1), Anuradha Koratkar (a2), Mark Allen (a3), Zlatan Tsvetanov (a3) and Michael Dopita (a4)...

Abstract

Photoionization and shock models of the extended emissionline regions (EELRs) in active galaxies demonstrate that the optical emission lines alone are a poor discriminant of the excitation mechanism. Combining optical and UV data provides a discriminant between nuclear photoionization and autoionizing shock models. Hubble Space Telescope UV spectrophotometry of two Seyferts suggests that the EELRs in these objects are probably photoionized by the nucleus.

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References

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Dopita, M.A., et al. 1996, in preparation.
Morganti, R., et al. 1991, MNRAS, 249, 91.
Sutherland, R.S., Bicknell, G.V., & Dopita, M.A. 1993, ApJ, 414, 510.
Tadhunter, C.N., Robinson, A., & Morganti, R. 1989, in Extranuclear Activity in Galaxies, ed. Meurs, J. & Fosbury, R., (Garching: ESO), 293.

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