The origin of the UV radiation in elliptical galaxies.

Physics

Scientific paper

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Scientific paper

Elliptical galaxies known to be dominated by old stellar population have unexpectedly rising radiation flux below 2000 A. Various expla- nations of this phenomenon had been proposed: old metal-poor or old metal-rich low-mass stars in late evolutionary stages, or small fraction of young, rather mas- sive stars. Observational data acquired by various UV experiments for elliptical galaxies are surveyed in this contribution, and their significance for unveiling the nature of UV radiation excess in spectra of elliptical galaxies is estimated.

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