Weighing the IMBH candidate CO-0.40-0.22* in the Galactic Centre
  The high velocity gradient observed in the compact cloud CO-0.40-0.22, at a
projected distance of 60 pc from the centre of the Milky Way, has led its
discoverers to identify the closeby mm continuum emitter, CO-0.40-0.22*, with
an intermediate mass black hole (IMBH) candidate. We describe the interaction
between CO-0.40-0.22 and the IMBH, by means of a simple analytical model and of
hydrodynamical simulations. Through such calculation, we obtain a lower limit
to the mass of CO-0.40-0.22* of few $10^4 \times \; M_{\odot}$. This result
tends to exclude the formation of such massive black hole in the proximity of
the Galactic Centre. On the other hand, CO-0.40-0.22* might have been brought
to such distances in cosmological timescales, if it was born in a dark matter
halo or globular cluster around the Milky Way.
