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For refcode 1994A&A...292...13B:
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1994A&A...292...13B Photoionization in elliptical galaxies by old stars L. Binette, C.C. Magris, C. Stasinska, and A.G. Bruzual DAEC, Observatoire de Meudon, F-92195 Meudon Principal Cedex, France Centro de Investigaciones de Astronomia (CIDA), A.P. 264, Merida 5101, Venezuela Landessternwarte Heidelberg-Konigstuhl, D-69117 Heidelberg, Germany Received 25 February 1994/Accepted 11 April 1994 Abstract. In an effort to explain the ionization of gas in elliptical galaxies, we have computed the Lyman continuum output from an ageing starburst, using isochrone synthesis spectral evolution techniques. We have shown that post-AGB stars provide sufficient ionizing radiation to account for the observed HQ luminosity and equivalent width in very early type galaxies. Photoionization models using the radiation field from these stars are shown to easily reproduce the excitation level of the ionized gas. Thus, we argue that the ionization observed in normal elliptical galaxies is provided by their old stellar populations. Key words: galaxies: elliptical - galaxies: ISM - galaxies: stellar content
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