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The bolometric and UV attenuation in normal spiral galaxies of the Herschel Reference Survey

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Abstract
The dust in nearby galaxies absorbs a fraction of the UV-optical-near-infrared radiation produced by stars. This energy is consequently re-emitted in the infrared. We investigate the portion of the stellar radiation absorbed by spiral galaxies from the Herschel Reference Survey (HRS) by modelling their UV-to-submillimetre spectral energy distributions. Our models provide an attenuated and intrinsic spectral energy distribution (SED), from which we find that on average 32% of all starlight is absorbed by dust. We define the UV heating fraction as the percentage of dust luminosity that comes from absorbed UV photons and find this to be 56%, on average. This percentage varies with morphological type, with later types having significantly higher UV heating fractions. We find a strong correlation between the UV heating fraction and specific star formation rate and provide a power-law fit. Our models allow us to revisit the IRX - A(FUV) relations, and derive these quantities directly within a self-consistent framework. We calibrate this relation for different bins of NUV - r colour and provide simple relations to relate these parameters. We investigated the robustness of our method and conclude that the derived parameters are reliable within the uncertainties that are inherent to the adopted SED model. This calls for a deeper investigation of how well extinction and attenuation can be determined through panchromatic SED modelling.
Keywords
galaxies: ISM, Galaxy: fundamental parameters, dust, extinction, infrared: ISM, SPECTRAL ENERGY-DISTRIBUTIONS, STAR-FORMING GALAXIES, VIRGO CLUSTER GALAXIES, BAND-SELECTED SAMPLE, NEARBY GALAXIES, STARBURST GALAXIES, INFRARED-EMISSION, DUST ATTENUATION, FORMATION RATES, STELLAR MASSES

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Chicago
Viaene, Sébastien, Maarten Baes, G Bendo, M Boquien, A Boselli, L Ciesla, L Cortese, et al. 2016. “The Bolometric and UV Attenuation in Normal Spiral Galaxies of the Herschel Reference Survey.” Astronomy & Astrophysics 586.
APA
Viaene, Sébastien, Baes, M., Bendo, G., Boquien, M., Boselli, A., Ciesla, L., Cortese, L., et al. (2016). The bolometric and UV attenuation in normal spiral galaxies of the Herschel Reference Survey. ASTRONOMY & ASTROPHYSICS, 586.
Vancouver
1.
Viaene S, Baes M, Bendo G, Boquien M, Boselli A, Ciesla L, et al. The bolometric and UV attenuation in normal spiral galaxies of the Herschel Reference Survey. ASTRONOMY & ASTROPHYSICS. 2016;586.
MLA
Viaene, Sébastien, Maarten Baes, G Bendo, et al. “The Bolometric and UV Attenuation in Normal Spiral Galaxies of the Herschel Reference Survey.” ASTRONOMY & ASTROPHYSICS 586 (2016): n. pag. Print.
@article{8096822,
  abstract     = {The dust in nearby galaxies absorbs a fraction of the UV-optical-near-infrared radiation produced by stars. This energy is consequently re-emitted in the infrared. We investigate the portion of the stellar radiation absorbed by spiral galaxies from the Herschel Reference Survey (HRS) by modelling their UV-to-submillimetre spectral energy distributions. Our models provide an attenuated and intrinsic spectral energy distribution (SED), from which we find that on average 32\% of all starlight is absorbed by dust. We define the UV heating fraction as the percentage of dust luminosity that comes from absorbed UV photons and find this to be 56\%, on average. This percentage varies with morphological type, with later types having significantly higher UV heating fractions. We find a strong correlation between the UV heating fraction and specific star formation rate and provide a power-law fit. Our models allow us to revisit the IRX - A(FUV) relations, and derive these quantities directly within a self-consistent framework. We calibrate this relation for different bins of NUV - r colour and provide simple relations to relate these parameters. We investigated the robustness of our method and conclude that the derived parameters are reliable within the uncertainties that are inherent to the adopted SED model. This calls for a deeper investigation of how well extinction and attenuation can be determined through panchromatic SED modelling.},
  articleno    = {A13},
  author       = {Viaene, S{\'e}bastien and Baes, Maarten and Bendo, G and Boquien, M and Boselli, A and Ciesla, L and Cortese, L and De Looze, Ilse and Eales, S and Fritz, Jacopo and Karczewski, O\unmatched{0141} and Madden, S and Smith, MWL and Spinoglio, L},
  issn         = {1432-0746},
  journal      = {ASTRONOMY \& ASTROPHYSICS},
  keyword      = {galaxies: ISM,Galaxy: fundamental parameters,dust,extinction,infrared: ISM,SPECTRAL ENERGY-DISTRIBUTIONS,STAR-FORMING GALAXIES,VIRGO CLUSTER GALAXIES,BAND-SELECTED SAMPLE,NEARBY GALAXIES,STARBURST GALAXIES,INFRARED-EMISSION,DUST ATTENUATION,FORMATION RATES,STELLAR MASSES},
  language     = {eng},
  pages        = {13},
  title        = {The bolometric and UV attenuation in normal spiral galaxies of the Herschel Reference Survey},
  url          = {http://dx.doi.org/10.1051/0004-6361/201527586},
  volume       = {586},
  year         = {2016},
}

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