AAS 201st Meeting, January, 2003
Session 11. Seyfert Galaxies and AGNs
Poster, Monday, January 6, 2003, 9:20am-6:30pm, Exhibit Hall AB

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[11.10] The Energizing Source of the Emission Lines in LINER/Transition-Type Galaxies

L. P. Martins, C. Leitherer (STScI)

The emission line spectra of active galactic nuclei fall into three main categories: star formation nuclei (or HII regions), Seyfert nuclei, or LINERs (low ionization narrow emission-line regions). A subset of these galactic nuclei has intermediate characteristics between LINERs and HII regions. These so-called transition objects (Ho et al. 1993) were subject of numerous studies in the past, but their true nature has remained elusive. We generated photoionization models that can account consistently for all the process that are relevant: photoionization by stars, shocks, dust, and a power-law radiation spectrum. The Starbust99 code was updated to produce a realistic stellar continuum from the EUV to the optical and coupled to the Mappings photoionization code to account for all the processes in a consistent way. Initial results from our simulations and a comparison to observed spectra are presented.

The author(s) of this abstract have provided an email address for comments about the abstract: martins@stsci.edu

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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.