Journal Article

Investigations of dust heating in M81, M83 and NGC 2403 with the <i>Herschel Space Observatory</i>

G. J. Bendo, A. Boselli, A. Dariush, M. Pohlen, H. Roussel, M. Sauvage, M. W. L. Smith, C. D. Wilson, M. Baes, A. Cooray, D. L. Clements, L. Cortese, K. Foyle, M. Galametz, H. L. Gomez, V. Lebouteiller, N. Lu, S. C. Madden, E. Mentuch, B. O’Halloran, M. J. Page, A. Remy, B. Schulz and L. Spinoglio

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 419, issue 3, pages 1833-1859
Published in print January 2012 | ISSN: 0035-8711
Published online January 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.19735.x
Investigations of dust heating in M81, M83 and NGC 2403 with the Herschel Space Observatory

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We use Spitzer Space Telescope and Herschel Space Observatory far-infrared data along with ground-based optical and near-infrared data to understand how dust heating in the nearby face-on spiral galaxies M81, M83 and NGC 2403 is affected by the starlight from all stars and by the radiation from star-forming regions. We find that 70/160 m surface brightness ratios tend to be more strongly influenced by star-forming regions. However, the 250/350 m and 350/500 m surface brightness ratios are more strongly affected by the light from the total stellar populations, suggesting that the dust emission at >250 m originates predominantly from a component that is colder than the dust seen at <160 m and that is relatively unaffected by star formation activity. We conclude by discussing the implications of this for modelling the spectral energy distributions of both nearby and more distant galaxies and for using far-infrared dust emission to trace star formation.

Keywords: galaxies: individual: M81; galaxies: individual: M83; galaxies: individual: NGC 2403; galaxies: ISM; galaxies: spiral; infrared: galaxies

Journal Article.  16174 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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