Physics
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999sf99.proc...96o&link_type=abstract
Star Formation 1999, Proceedings of Star Formation 1999, held in Nagoya, Japan, June 21 - 25, 1999, Editor: T. Nakamoto, Nobeyam
Physics
Scientific paper
Evaluating the IRTS 155 μm and IRAS 12--100 μm data, clear correlations were found between the intensity of emissions at 12--60 μm, the total far-infrared intensity (FIR), and the strength of the radiation field (G0) in several HII regions. The IRAS 12 μm band intensity is proportional to FIR, and the ratios of the intensities of the emissions in the IRAS 25 and 60 μm bands to the total far-infrared intensity are proportional to G00.8-1.1. These correlations are seen in the data of HII regions with various physical conditions. They suggest that the emitters of the emission at 12--60 μm are well mixed with large grains radiating at wavelength greater than 100 μm and imply that the ratio of the mass of these emitters to the mass of the large grains is constant in interstellar space. The IRAS 12 μm emission seems to be largely due to unidentified infrared features. The IRAS 25 and 60 μm emissions seem to originate from very small grains transiently heated by multiple-photon events.
Hiromoto Norihisa
Makiuti Shin'ichiro
Matsuhara Hideo
Nakagawa Takao
Okuda Haruyuki
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