NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-20 T05:58:07 PDT
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For refcode 2007ApJ...666..870C:
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Copyright by American Astronomical Society. Reproduced by permission
2007ApJ...666..870C The Calibration of Mid-Infrared Star Formation Rate Indicators D. Calzetti, R. C. Kennicutt, C. W. Engelbracht, C. Leitherer, B. T. Draine, L. Kewley, J. Moustakas, M. Sosey, D. A. Dale, K. D. Gordon, G. X. Helou, D. J. Hollenbach, L. Armus, G. Bendo, C. Bot, B. Buckalew, T. Jarrett, A. Li, M. Meyer, E. J. Murphy, M. Prescott, M. W. Regan, G. H. Rieke, H. Roussel, K. Sheth, J. D. T. Smith, M. D. Thornley, and F. Walter Abstract. With the goal of investigating the degree to which the MIR emission traces the SFR, we analyze Spitzer 8 and 24 micron data of star-forming regions in a sample of 33 nearby galaxies with available HST NICMOS images in the Pa{alpha} (1.8756 micron) emission line. The galaxies are drawn from the SINGS sample and cover a range of morphologies and a factor ~10 in oxygen abundance. Published data on local low-metallicity starburst galaxies and LIRGs are also included in the analysis. Both the stellar continuum -- subtracted 8 micron emission and the 24 micron emission correlate with the extinction-corrected Pa{alpha} line emission, although neither relationship is linear. Simple models of stellar populations and dust extinction and emission are able to reproduce the observed nonlinear trend of the 24 micron emission versus number of ionizing photons, including the modest deficiency of 24 micron emission in the low-metallicity regions, which results from a combination of decreasing dust opacity and dust temperature at low luminosities. Conversely, the trend of the 8 micron emission as a function of the number of ionizing photons is not well reproduced by the same models. The 8 micron emission is contributed, in larger measure than the 24 micron emission, by dust heated by nonionizing stellar populations, in addition to the ionizing ones, in agreement with previous findings. Two SFR calibrations, one using the 24 micron emission and the other using a combination of the 24 micron and H{alpha} luminosities (Kennicutt and coworkers), are presented. No calibration is presented for the 8 micron emission because of its significant dependence on both metallicity and environment. The calibrations presented here should be directly applicable to systems dominated by ongoing star formation. Key words: Galaxies: Interactions, Galaxies: ISM, Galaxies: Starburst, ISM: Structure
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