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The fate of ionizing radiation is vital for understanding cosmic ionization,energy budgets in the interstellar and intergalactic medium, and star formationrate indicators. The low observed escape fractions of ionizing radiation havenot been adequately explained, and there is evidence that some starbursts havehigh escape fractions. We examine the spectral energy distributions of a sampleof local star-forming galaxies, containing thirteen local starburst galaxiesand ten of their ordinary star-forming counterparts, to determine if thereexist significant differences in the fate of ionizing radiation in thesegalaxies. We find that the galaxy-to-galaxy variations in the SEDs is muchlarger than any systematic differences between starbursts and non-starbursts.For example, we find no significant differences in the total absorption ofionizing radiation by dust, traced by the 24um, 70um, and 160um MIPS bands ofthe Spitzer Space Telescope, although the dust in starburst galaxies appears tobe hotter than that of non-starburst galaxies. We also observe no excessultraviolet flux in the GALEX bands that could indicate a high escape fractionof ionizing photons in starburst galaxies. The small H-alpha fractions of thediffuse, warm ionized medium in starburst galaxies are apparently due totemporarily boosted H-alpha luminosity within the star-forming regionsthemselves, with an independent, constant WIM luminosity. This independence ofthe WIM and starburst luminosities contrasts with WIM behavior in non-starburstgalaxies and underscores our poor understanding of radiation transfer in bothordinary and starburst galaxies.

A Multiwavelength Study on the Fate of Ionizing Radiation in Local Starbursts