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Date and Time of the Query: 2019-03-18 T09:45:55 PDT
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For refcode 2009ApJ...703.1672K:
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2009ApJ...703.1672K Dust-corrected Star Formation Rates of Galaxies. I. Combinations of H{alpha}' and Infrared Tracers Kennicutt, Robert C.; Hao, Cai-Na; Calzetti, Daniela; Moustakas, John; Dale, Daniel A.; Bendo, George; Engelbracht, Charles W.; Johnson, Benjamin D.; Lee, Janice C. Abstract. We combine H{alpha}' emission-line and infrared (IR) continuum measurements of two samples of nearby galaxies to derive dust attenuation-corrected star formation rates (SFRs). We use a simple energy balance based method that has been applied previously to H II regions in the Spitzer Infrared Nearby Galaxies Survey, and extend the methodology to integrated measurements of galaxies. We find that our composite H{alpha}' + IR based SFRs are in excellent agreement with attenuation-corrected SFRs derived from integrated spectrophotometry, over the full range of SFRs (0.01-80 M_sun_ yr^-1^) and attenuations (0-2.5 mag) studied. We find that the combination of H{alpha}' and total IR luminosities provides the most robust SFR measurements, but combinations of H{alpha}' measurements with monochromatic luminosities at 24 micron and 8 micron perform nearly as well. The calibrations differ significantly from those obtained for H II regions, with the difference attributable to a more evolved population of stars heating the dust. Our results are consistent with a significant component of diffuse dust (the "IR cirrus" component) that is heated by a non-star-forming population. The same methodology can be applied to [O II]{lambda}3727 emission-line measurements, and the radio continuum fluxes of galaxies can be applied in place of IR fluxes when the latter are not available. We assess the precision and systematic reliability of all of these composite methods. Key words: dust, extinction, galaxies: evolution, galaxies: ISM, H II regions, stars: formation
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