Abstract
A detailed map of the [C II] 158 μm line emission from the ρ Ophiuchi dark cloud has been obtained using a balloon-borne telescope (BICE). The [C II] emission is extended throughout the cloud (8 pc×6 pc), indicating that UV radiation in the cloud is not localized but is ubiquitously distributed. The peak of the emission corresponds to the position of the highly reddened B2 V star HD 147889. The ratio I [CII] /I bol in the ρ Ophiuchi cloud is higher than those found in active star-forming regions with O-type stars, which indicates a higher gas heating efficiency in the ρ Ophiuchi cloud
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