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We mapped the high-velocity compact cloud CO-0.40-0.22 in 21 molecular linesin the 3 mm band using the Nobeyama Radio Observatory 45 m radio telescope.Eighteen lines were detected from CO-0.40-0.22. The map of each detected lineshows that this cloud has a compact appearance (d=~3 pc) and extremely broadvelocity width (DV=~100 km/s). The mass and kinetic energy of CO-0.40-0.22 areestimated to be 10^{3.6} M_sun and 10^{49.7} erg, respectively. Therepresentative position-velocity map along the major axis shows thatCO-0.40-0.22 consists of an intense region with a shallow velocity gradient anda less intense high-velocity wing. Here, we show that this kinematicalstructure can be attributed to a gravitational kick to the molecular cloudcaused by an invisible compact object with a mass of ~10^5 M_sun. Itscompactness and the absence of counterparts at other wavelengths suggest thatthis massive object is an intermediate-mass black hole.

Signature of an Intermediate-Mass Black Hole in the Central Molecular Zone of Our Galaxy