On the fate of galactic centre molecular clouds.

One third of the CO-emitting gas within 500 pc of the Galactic Center is in a few massive clouds. If these clouds have masses of the expected order 3,000,000 solar masses), even the outermost is doomed to spiral into the center within 1 Gyr. The subsequent evolution is unclear, but it will almost certainty be violent. This suggests that the Galactic center is subjected to starbursts.