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Using two-dimensional magnetohydrodynamic simulations, we investigated thegas dynamics around a black hole plunging into a molecular cloud. In thesecalculations, we assumed a parallel-magnetic-field layer in the cloud. The sizeof the accelerated region is far larger than the Bondi-Hoyle-Lyttleton radius,being approximately inversely proportional to the Alfv\'en Mach number for theplunging black hole. Our results successfully reproduce the "Y" shape inposition velocity maps of the "Bullet" in the W44 molecular cloud. The size ofthe Bullet is also reproduced within an order of magnitude using a reasonableparameter set. This consistency supports the shooting model of the Bullet,according to which an isolated black hole plunged into a molecular cloud toform a compact broad-velocity-width feature.

Magnetohydrodynamic Simulations of a Plunging Black Hole into a Molecular Cloud