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

  • Tomoharu Oka (a1), Reiko Mizuno (a1), Kodai Miura (a1) and Shunya Takekawa (a1)

Abstract

The high-velocity compact cloud CO–0.40–0.22 was mapped in 22 molecular lines with the NRO 45 m radio telescope and the ASTE 10 m telescope. The map of each detected line shows that this cloud has a compact appearance (d≃3 pc) and extremely broad velocity width (Δ V≃100 km s−1). The representative position–velocity map along the major axis shows that CO–0.40–0.22 consists of an intense region with a shallow velocity gradient and a less intense high-velocity wing. This kinematical structure can be attributed to a gravitational kick to the molecular cloud caused by an invisible compact object with a mass of ~105 M . Its compactness and the absence of a counterpart at other wavelengths suggest that this massive object is an intermediate-mass black hole.

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