AAS 205th Meeting, 9-13 January 2005
Session 27 Active Galactic Nuclei
Poster, Monday, January 10, 2005, 9:20am-6:30pm, Exhibit Hall

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[27.03] An Alternative Approach to Modelling Some Active Galactic Nuclei: Spherically Symmetric Outflows

D. Casebeer, E. Baron, K. Leighly (University of Oklahoma)

We find that spectra from the class of objects known as iron low ionization broad absorption line (FeLOBAL) active galactic nuclei, which are characterized by low-ionization emission and blue-shifted absorption lines, have features consistent with outflows such as stellar winds or supernovae. We present an alternative to the canonical (very parameterized) model for absorption and emission lines for FeLoBALs. This model is of a spherically symmetric expanding ball of gas which would be consistent with an outflow. An advantage to this model is that we use a single line forming region and therefore model the absorption and emission lines simultaneously. In addition we have only a handful of observable parameters such as luminosity and velocity structure.

We use the the stellar atmospheres code PHOENIX to model the spectra. PHOENIX is a generalized NLTE stellar atmosphere code. It can calculate atmospheres and spectra of stars across the HR-diagram, novae, and supernovae. PHOENIX self-consistently calculates the radiation field and the NLTE level populations including all special relativistic effects. PHOENIX includes an enormous database of line transitions and up-to-date cross sections for atoms and molecules. Recently PHOENIX has incorporated data from the CHIANTI and APED databases.

We present preliminary model results and analysis.

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