Dust color temperature distribution of two FIR cavities at IRIS and AKARI maps

By systematically searching the region of far infrared loops, we found a number of huge cavity-like dust structures at $$60\,\mu \hbox {m}$$ and $$100\,\mu \hbox {m}$$ IRIS maps. By checking these with AKARI maps ( $$90\,\mu \hbox {m}$$ and $$140\,\mu \hbox {m}$$ ), two new cavity-like structures (sizes $$\sim $$ $$ 2.7\,\hbox {pc} \times 0.8\,\hbox {pc}$$ and $$\sim $$ $$ 1.8\,\hbox {pc} \times 1\,\hbox {pc}$$ ) located at R.A. ( $$\hbox {J}2000)=14^{h}41^{m}23^{s}$$ and Dec. $$(\hbox {J}2000)=-64^{\circ }04^{\prime }17^{{\prime }{\prime }}$$ and R.A. $$(\hbox {J}2000)=05^{h}05^{m}35^{s}$$ and Dec. $$(\hbox {J}2000)=-\,69^{\circ }35^{\prime } 25^{{\prime }{\prime }}$$ were selected for the study. The difference in the average dust color temperatures calculated using IRIS and AKARI maps of the cavity candidates were found to be $$3.2\pm 0.9\,\hbox {K}$$ and $$4.1\pm 1.2\,\hbox {K}$$ , respectively. Interestingly, the longer wavelength AKARI map gives larger values of dust color temperature than that of the shorter wavelength IRIS maps. Possible explanation of the results will be presented.