Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...484..222m&link_type=abstract
Astrophysical Journal v.484, p.222
Astronomy and Astrophysics
Astronomy
9
Ism: Dust, Extinction, Infrared: Galaxies, Galaxies: Starburst
Scientific paper
The IRAS 12 and 25 mu m fluxes are compared with the Br gamma flux in a sample of starburst nuclei. Good correlations are found between them. The subsequent analysis indicates the presence of two components in the mid-infrared continuum: the nonthermal emission from "small grains" (<=100 A) which are heated transiently by nonionizing photons outside the H II regions and the thermal emission from "large grains" which are heated to ~140 K by ionizing, nonionizing, and Ly alpha photons inside the H II regions. The small grains emitting at 12 mu m are depleted by ~20% with respect to cirrus clouds in our Galaxy. The ratio of amounts of large grains to gas in the H II regions is comparable to the standard interstellar value. The emission from hot large grains appears to be more enhanced over the emission from small grains in starburst nuclei with higher excitations.
Kawara Kimiaki
Mouri Hideaki
Taniguchi Yoshiaki
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