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Herschel Far-Infrared and Sub-millimeter Photometry for the KINGFISH Sample of Nearby Galaxies

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arxiv 1112.1093 v1 pith:AJRLYLMB submitted 2011-12-05 astro-ph.CO astro-ph.GA

D. A. Dale , G. Aniano , C. W. Engelbracht , J. L. Hinz , O. Krause , E. J. Montiel , H. Roussel , P. N. Appleton
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L. Armus P. Beirao A. D. Bolatto B. R. Brandl D. Calzetti A. F. Crocker K. V. Croxall B. T. Draine M. Galametz K. D. Gordon B. A. Groves C.-N. Hao G. Helou L. K. Hunt B. D. Johnson R. C. Kennicutt J. Koda A. K. Leroy Y. Li S. E. Meidt A. E. Miller E. J. Murphy N. Rahman H.-W. Rix K. M. Sandstrom M. Sauvage E. Schinnerer R. A. Skibba J.-D.T. Smith F. S. Tabatabaei F. Walter C. D. Wilson M. G. Wolfire S. Zibetti
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keywords dustfar-infraredgalaxiesherschelemissionnearbyphotometrysub-millimeter
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New far-infrared and sub-millimeter photometry from the Herschel Space Observatory is presented for 61 nearby galaxies from the Key Insights on Nearby Galaxies: A Far-Infrared Survey with Herschel (KINGFISH) sample. The spatially-integrated fluxes are largely consistent with expectations based on Spitzer far-infrared photometry and extrapolations to longer wavelengths using popular dust emission models. Dwarf irregular galaxies are notable exceptions, as already noted by other authors, as their 500um emission shows evidence for a sub-millimeter excess. In addition, the fraction of dust heating attributed to intense radiation fields associated with photo-dissociation regions is found to be (21+/-4)% larger when Herschel data are included in the analysis. Dust masses obtained from the dust emission models of Draine & Li are found to be on average nearly a factor of two higher than those based on single-temperature modified blackbodies, as single blackbody curves do not capture the full range of dust temperatures inherent to any galaxy. The discrepancy is largest for galaxies exhibiting the coolest far-infrared colors.

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