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The Emission by Dust and Stars of Nearby Galaxies in the Herschel KINGFISH Survey

Skibba, Ramin A. and Murphy, Eric and Appleton, Philip and Armus, Lee and Wolfire, Mark (2011) The Emission by Dust and Stars of Nearby Galaxies in the Herschel KINGFISH Survey. Astrophysical Journal, 738 (1). Art. No. 89. ISSN 0004-637X.

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Using new far-infrared imaging from the Herschel Space Observatory with ancillary data from ultraviolet (UV) to submillimeter wavelengths, we estimate the total emission from dust and stars of 62 nearby galaxies in the KINGFISH survey in a way that is as empirical and model independent as possible. We collect and exploit these data in order to measure from the spectral energy distributions (SEDs) precisely how much stellar radiation is intercepted and re-radiated by dust, and how this quantity varies with galaxy properties. By including SPIRE data, we are more sensitive to emission from cold dust grains than previous analyses at shorter wavelengths, allowing for more accurate estimates of dust temperatures and masses. The dust/stellar flux ratio, which we measure by integrating the SEDs, has a range of nearly three decades (from 10^(−2.2) to 10^(0.5)). The inclusion of SPIRE data shows that estimates based on data not reaching these far-IR wavelengths are biased low by 17% on average. We find that the dust/stellar flux ratio varies with morphology and total infrared (IR) luminosity, with dwarf galaxies having faint luminosities, spirals having relatively high dust/stellar ratios and IR luminosities, and some early types having low dust/stellar ratios. We also find that dust/stellar flux ratios are related to gas-phase metallicity (log(f_(dust)/f_∗) = −0.66 ± 0.08 and −0.22 ± 0.12 for metal-poor and intermediate-metallicity galaxies, respectively), while the dust/stellar mass ratios are less so (differing by ≈0.2 dex); the more metal-rich galaxies span a much wider range of the flux ratios. In addition, the substantial scatter between dust/stellar flux and dust/stellar mass indicates that the former is a poor proxy of the latter. Comparing the dust/stellar flux ratios and dust temperatures, we also show that early types tend to have slightly warmer temperatures (by up to 5 K) than spiral galaxies, which may be due to more intense interstellar radiation fields, or possibly to different dust grain compositions. Finally, we show that early types and early-type spirals have a strong correlation between the dust/stellar flux ratio and specific star formation rate, which suggests that the relatively bright far-IR emission of some of these galaxies is due to ongoing (if limited) star formation as well as to the radiation field from older stars, which is heating the dust grains.

Item Type:Article
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URLURL TypeDescription
Murphy, Eric0000-0001-7089-7325
Appleton, Philip0000-0002-7607-8766
Armus, Lee0000-0003-3498-2973
Wolfire, Mark0000-0003-0030-9510
Additional Information:© 2011 The American Astronomical Society. Received 2011 March 25; accepted 2011 June 20; published 2011 August 16. We thank John Moustakas for providing and discussing the oxygen abundances of Moustakas et al. (2010). We thank Andy Marble for valuable discussions about our results. We also thank the anonymous referee for insightful comments that helped to improve the quality of the paper. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. SPIRE has been developed by a consortium of institutes led by Cardiff University (UK) and including University of Lethbridge (Canada); NAOC (China); CEA, LAM(France); IFSI, University of Padua (Italy); IAC (Spain); Stockholm Observatory (Sweden); Imperial College London, RAL, UCL-MSSL, UKATC, University of Sussex (UK); and Caltech, JPL, NHSC, University of Colorado (USA). This development has been supported by national funding agencies: CSA (Canada); NAOC (China); CEA, CNES, CNRS (France); ASI (Italy); MCINN (Spain); SNSB (Sweden); STFC (UK); and NASA (USA).
Funding AgencyGrant Number
Canadian Space Agency (CSA)UNSPECIFIED
National Astronomical Observatories, Chinese Academy of Sciences (NAOC)UNSPECIFIED
Commissariat à l’Énergie Atomique (CEA)UNSPECIFIED
Centre National d'Études Spatiales (CNES)UNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Agenzia Spaziale Italiana (ASI)UNSPECIFIED
Ministerio de Ciencia e Innovación (MCINN)UNSPECIFIED
Swedish National Space Board (SNSB)UNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
Subject Keywords:dust, extinction; galaxies: evolution; galaxies: general; galaxies: ISM; galaxies: photometry; infrared: galaxies
Issue or Number:1
Classification Code:PACS: 95.80.+p; 98.52.Nr; 98.70.Lt; 98.52.Wz; 98.62.Nx; 98.62.Ai
Record Number:CaltechAUTHORS:20110908-141239143
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Official Citation:The Emission by Dust and Stars of Nearby Galaxies in the Herschel KINGFISH Survey Ramin A. Skibba et al. 2011 ApJ 738 89
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:25263
Deposited By: Ruth Sustaita
Deposited On:08 Sep 2011 22:18
Last Modified:24 Feb 2020 10:30

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