Photoionization in elliptical galaxies by old stars

Details Photoionization in elliptical galaxies by old stars Photoionization in elliptical galaxies by old stars

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...292...13b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 292, no. 1, p. 13-19

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123

Computational Astrophysics, Elliptical Galaxies, Photoionization, Star Formation, Starburst Galaxies, Stellar Evolution, Stellar Luminosity, Stellar Physics, Atmospheric Models, H Alpha Line, Interstellar Matter, Ionized Gases, Radiation Spectra, Stellar Mass, Stellar Models

Scientific paper

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 H-alpha 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.

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