New 6-8-arcsec resolution images of the dust emission from the Orion-KL region at wavelengths of 3.5 mm and 450 microns are presented. These images show an extended ridge of emission with three prominent peaks: (1) the hot core clump about 2 arcsec SE of IRc2; (2) the western clump, about 5 arcsec NW of IRc2; and (3) the north ridge clump, CS1, about 30 arcsec NE of IRc2. Because the maps have comparable resolution and span a wide frequency range, they make it possible to place constraints on the dust emissivities in these sources. It is found that the dust opacity scales as nu exp 1.5 toward CS1 and the western clump, but as nu-squared toward the hot core, possibly because the intense local radiation field from IRc2 has altered the grain properties in the hot core.
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Wright et al. (1992) studied this question.