AAS 207th Meeting, 8-12 January 2006
Session 42 Element and Stellar Evolution
Oral, Monday, 10:00-11:30am, January 9, 2006, Wilson A/B

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[42.05] The Stellar Populations and Energy Source of LLAGNs

L. Martins, C. Leitherer (Space Telescope Science Institute), S. Viegas (IAG-USP Brazil), R. Cid Fernandes (Universidade Federal de Santa Catarina-Brazil), R. Gonzalez Delgado (IAA-Spain)

We present in this work a study of Low Luminosity Active Galactic Nuclei (LLAGN). Our main goal is to search for spectroscopic signatures of young and intermediate age stars, and to investigate their relationship with the ionization mechanism in LLAGN. The method used is based on the stellar population synthesis of the optical continuum of the innermost (20 – 100 pc) regions in these galaxies, combined with the analysis of their emission lines. For this purpose, we have collected high spectral and spatial resolution ground-based long slit spectroscopy in the 3500 – 5500 Å interval for a sample of 60 galaxies (51 LLAGNs, 2 Starbursts and 7 non-active galaxies), and the spectra of 28 nearby LLAGN obtained with STIS in the 2900 – 5700 Å optical range, that are available in the Hubble Space Telescope archive. We created a high resolution stellar library, used to construct a base of stellar population spectra, aplied in the population synthesis of these galaxies. We compared the results using these synthetical spectra with an empirical study of the stellar population in these galaxies, and complemented the analysis with an study of their emission lines.

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