[CII] emission properties of the massive star-forming region RCW 36 in a filamentary molecular cloud

Aims: To investigate properties of [CII]158 $\mu$m emission RCW36 in a dense filamentary cloud. Methods: [CII] observations covering an area ~30 arcmin$\times$30 arcmin were carried out with Fabry-P\'{e}rot spectrometer aboard 100-cm balloon-borne far-infrared (IR) telescope angular resolution 90 arcsec. By using AKARI and Herschel images, the spatial distribution intensity was compared those from large grains PAH. Results: The is spatially good agreement shell-like structures bipolar lobe observed IR which extend along direction perpendicular to cold filament. We found that [CII]--160 relation for shows higher brightness ratio [CII]/160 than RCW 38, while [CII]--9 RCW38. Conclusions: well correlates PAH dust emissions. This means dominantly comes PDRs. Moreover, L_[CII]/L_FIR variation L_[CII]/L_PAH ratio. In view tight correlation between optical depth at $\lambda$=160 $\mu$m, can be simply explained by geometrical effect, viz., L_FIR has contributions entire dust-cloud column line sight, L_[CII] far-UV illuminated cloud surfaces. Based on picture geometry enhanced attributed difference gas where massive stars are formed: (RCW36) clumpy (RCW38) molecular clouds thus suggests dominated surfaces