NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-21 T07:27:39 PDT
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For refcode 1988A&A...195...60B:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1988A&A...195...60B A two-component model for the 40-120 micron emission from normal disk galaxies V. Buat and J.M. Deharveng Laboratoire d'Astronomie Spatiale, Allee Peiresc, Les Trois Lucs, F-13012 Marseille, France Received April 23, accepted October 21, 1987 Summary. By analogy with models available for our Galaxy, a model with a cold and a warm component is proposed to explain the 40-120 micron emission of normal late-type galaxies as observed with IRAS. The approach makes use of published H I, H{alpha} and far ultraviolet (~2000 A) total fluxes. The cold component dust is associated with the neutral interstellar medium and heated by the general interstellar radiation field. The temperature of this component is constrained by the IRAS 100 micron flux density. Its emission is proportional to the H I flux and is found to correlate well with the far ultraviolet emission. The warm component dust is associated with ionized hydrogen in extended low density H II regions and heated by hot ionizing stars. Its emission is taken proportional to the H{alpha} emission. The model predicts only 75 to 80 percent of the observed 40-120 micron fluxes. The most plausible explanation for this discrepancy is an underestimation of the warm component emission. Key words: Galaxies: irregular - galaxies: spiral - infrared radiation - interstellar medium: dust - UV radiation
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