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

Abstract

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.