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Hidetoshi Sano,TOMOYA AMATSUTSU,TORU KONDO,KEICHIRO NAKAMICHI,MITSUYOSHI YAMAGISHI,DAISUKE ISHIHARA,SHINKI OYABU,HIDEHIRO KANEDA,KENGO TACHIHARA,YASUO FUKUI 한국천문학회 2017 天文學論叢 Vol.32 No.1
We present a comparative study of CO and polycyclic aromatic hydrocarbon (PAH) emission toward a region including the massive star-forming regions of NGC 6334 and NGC 6357. We use the NANTEN $^{12}$CO($J$=1--0) data and the $AKARI$ 9 $\mu$m All-Sky diffuse map in order to evaluate the calibration accuracy of the $AKARI$ data. We confirm that the overall CO distribution shows a good spatial correspondence with the PAH emission, and their intensities exhibit a good power-law correlation with a spatial resolution down to 4$\rq{}$ over the region of 10$^\circ$$\times$10$^\circ$. We also reveal poorer correlation for small scale structures between the two quantities toward NGC 6357, due to strong UV radiation from local sources. Larger scatter in the correlation toward NGC 6357 indicates higher ionization degree and/or PAH excitation than that of NGC 6334.