Other
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21741708s&link_type=abstract
American Astronomical Society, AAS Meeting #217, #417.08; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
We exploit data from the ultraviolet to submillimeter wavelengths of the 61 nearby galaxies in KINGFISH. We use the spectral energy distributions computed by Dale et al., using data from GALEX, SDSS (or other optical), 2MASS, Spitzer, and SCUBA, and to these we add SPIRE data from Herschel. Herschel observations allow us to trace cold dust components invisible to Spitzer, with reduced systematic uncertainties relative to ground-based submillimeter measurements. By using these data together, we can now measure precisely how much stellar radiation is intercepted and re-radiated by dust, and how this quantity varies with galaxy properties. We also determine what kind of local galaxies are most similar to those dominating the extragalactic background light.
We find that the dust/stellar flux ratio varies with morphology, metallicity, and total infrared luminosity in a way that suggests a common evolutionary sequence for some galaxies. We also obtain a correlation between the dust/stellar flux ratio and dust/stellar mass, although there is substantial scatter for late-type galaxies. Early-types and early-type spirals have a significant correlation between the dust/stellar ratio and specific star formation rate and dust temperature, suggesting that the bright far-IR emission of some galaxies is due to star formation, which is heating some of the dust populations. For S0 and Sa galaxies, relatively little ongoing star formation can significantly heat the dust. Finally, we discuss implications of our results for galaxy formation models and high redshift studies.
Based on observations obtained with the Herschel Space Telescope as part of KINGFISH (Key Insights on Nearby Galaxies: a Far Infrared Survey with Herschel; P.I.: R.C. Kennicutt), one of the Herschel Open Time Key Projects.
Dale Daniel
Engelbracht Chad W.
Groves Brent
Hinz Joannah
Hunt Leslie
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