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The infrared dark cloud G359.94+0.17 is a conspicuous, opaque cloud, which isseen in silhouette against the Galactic center. We found unexpectedly strong(~50 Jy) maser emission of CH3OH at 44 GHz with additional weak 22 GHz H2Omaser and 43 GHz SiO thermal emissions toward this cloud. Detections of thesemolecular lines indicate that strong star forming activities are proceeding inthis cloud, which were not reported previously despite of numerous works towardthe Galactic center. The line profiles of the NH3 inversion lines at 23 GHzindicate that G359.94+0.17 is composed of mainly two clouds with V(lsr)= 0, and15 km/s overlapped on the line of sight. The maser emission is associated withthe 15 km/s cloud, suggesting that it is located at the Norma spiral arm.

Maser Emission toward the Infrared Dark Cloud G359.94+0.17 Seen in Silhouette against the Galactic Center