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We present the results of near-infrared (2.5--5.4um) long-slit spectroscopyof the extended green object (EGO) G318.05+0.09 with AKARI. Two distinctsources are found in the slit. The brighter source has strong red continuumemission with H2O ice, CO2 ice, and CO gas and ice absorption features at 3.0,4.25um, 4.67um, respectively, while the other greenish object shows peculiaremission that has double peaks at around 4.5 and 4.7um. The former source islocated close to the ultra compact HII region IRAS 14498-5856 and is identifiedas an embedded massive young stellar object. The spectrum of the latter sourcecan be interpreted by blue-shifted (-3000 ~ -6000km/s) optically-thin emissionof the fundamental ro-vibrational transitions (v=1-0) of CO molecules withtemperatures of 12000--3700K without noticeable H2 and HI emission. We discussthe nature of this source in terms of outflow associated with the young stellarobject and supernova ejecta associated with a supernova remnant.

AKARI near-infrared spectroscopy of the extended green object G318.05+0.09: Detection of CO fundamental ro-vibrational emission