Abstract
Infrared color-color diagram of 10 giant molecular clouds are examined to explore the dust property from the COBE Diffuse Infrared Background Experiment of the 100, 140, and <TEX>$240{\mu}m$</TEX> emission. Four of them, Taurus, Mon OB1, Gem OB1, and Chameleon, show the anti-correlation in <TEX>$R_{100/140}-R_{140/240}$</TEX> plot and the horizontal distribution in <TEX>$R_{100/240}-R_{140/240}$</TEX> plot, which disagree with those of theoretical calculation. These could be explained by the depletion of <TEX>$100{\mu}m$</TEX> and the excess of <TEX>$140{\mu}m$</TEX> emission, though no existing dust model could support them. Mean color temperature of the anti-correlation region appears to be lower than that of the linear region, whose temperatures are 15.3, 17.0 K, respectively. And the linear region shows large dispersion in the plot of intensity relation. Both imply that a star formation would be more active, but not homogeneous, in the linear region compared to the anti-correlation region.
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