Abstract
We present our AKARI study of massive star forming regions where a large-scale cloud-cloud collision possibly contributes to massive star formation. Our targets are Spitzer bubbles, which consist of two types of bubbles, closed and broken ones; the latter is a candidate of the objects created by cloud-cloud collisions. We performed mid- and far-infrared surface photometry toward Spitzer bubbles to obtain the relationship between the total infrared luminosity, <TEX>$L_{IR}$</TEX>, and the bubble radius, R. As a result, we find that <TEX>$L_{IR}$</TEX> is roughly proportional to <TEX>$R^{\beta}$</TEX> where <TEX>${\beta}=2.1{\pm}0.4$</TEX>. Broken bubbles tend to have larger radii than closed bubbles for the same <TEX>$L_{IR}$</TEX>.
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