Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...195...60b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 195, no. 1-2, April 1988, p. 60-70.
Astronomy and Astrophysics
Astronomy
25
Infrared Radiation, Interstellar Matter, Irregular Galaxies, Spiral Galaxies, H Alpha Line, H I Regions, Infrared Astronomy Satellite
Scientific paper
By analogy with models available for the 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 FUV (200-nm) total fluxes. The cold component dust is associated with the neutral ISM 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 FUV 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 fluxes. The most plausible explanation for this discrepancy is an underestimation of the warm component emission.
Buat Veronique
Deharveng Jean Michel
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