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We mapped the ultra-high-velocity feature (the "Bullet") detected in theexpanding molecular shell associated with the W44 supernova remnant using theNobeyama Radio Observatory 45-m telescope and the ASTE 10-m telescope. TheBullet clearly appears in the CO ${\it J}$=1-0, CO ${\it J}$=3-2, CO ${\itJ}$=4-3, and HCO$^+$ ${\it J}$=1-0 maps with a compact appearance ($0.5\times0.8$ pc$^2$) and an extremely broad velocity width ($\Delta V\!\simeq\!100 \\rm km \, s ^{-1}$). The line intensities indicate that the Bullet has a higherdensity and temperature than those in the expanding molecular shell. Thekinetic energy of the Bullet amounts to $10^{48.0} \ {\rm erg}$ which isapproximately 1.5 orders of magnitude greater than the kinetic energy shared tothe small solid angle of it. Two possible formation scenarios with an inactiveisolated black hole (BH) are presented.

Kinematics of Ultra-High-Velocity Gas in the Expanding Molecular Shell adjacent to the W44 Supernova Remnant