Poster Title: Linking X-ray and optical emission of star-forming galaxies: models and observations
Abstract: The spectral modeling of stellar populations in the optical has come to a high level of detail thanks to the most recent stellar evolution theories and to improved stellar libraries. In addition to the metallicity, age and star formation history tracers available in the UV-optical-NIR spectra, complementary powerful tracers exist in X-rays. First, I will present a coupling between the UV-optical-NIR emission predicted with PEGASE and X-ray properties of star-forming galaxies. This multi-wavelength approach is made possible by modeling the simultaneous evolutions of the X-ray emitting population (mainly X-ray binaries and supernovae remnants) and of the optical emitters. I will then describe the dependence of the integrated X-ray light on the metallicity of the interstellar gas, as well as the use of X-rays as a star-formation history tracer, comparing models and observations. Finally, I will present the complementarity of X-ray and optical wavelengths for the estimation of metallicity and age: narrow spectral indices around absorption stellar lines in the optical are modeled with the high-spectral resolution code of galaxy evolution PEGASE-HR (R=10000), improving previous estimates of age and metallicity in stellar populations.
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