Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...371..142g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 371, April 10, 1991, p. 142-147. Research supported by NASA and Lowell Rese
Astronomy and Astrophysics
Astronomy
24
Far Infrared Radiation, H Ii Regions, Irregular Galaxies, Astronomical Models, Emission Spectra, Galactic Structure, Infrared Astronomy Satellite, Magellanic Clouds, Star Formation Rate
Scientific paper
IRAS FIR maps of NGC 6822, one of the few noninteracting Magellanic irregular galaxies resolved in the FIR by IRAS, are examined and compared to optical and H I data. The diffuse FIR emission at large radii from the center of the galaxy is found to be due to Galactic cirrus. There is a general correspondence between H-alpha and FIR emission in that FIR peaks are associated with major H II complexes, but the ratio of the FIR to the H-alpha emission varies between these complexes by about a factor of five. H I mass-to-FIR luminosity ratios cover a similar range for the three major H I cloud complexes in NGC 6822. More than about half of the FIR flux is produced in regions near H II region complexes. The remaining flux comes from diffuse FIR emission that extends over the entire optically visible galaxy. A model for the galaxy is discussed in which the galaxy is fairly transparent and the FIR is strongest where there is a strong UV source and higher optical depth due to dust in gas clouds.
Gallagher John S. III
Gillett Fred C.
Hunter Deidre Ann
Rice Walter L.
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