Astrophysics (Index)About

high-velocity cloud

(fast-moving clouds in galactic halos)

A high-velocity cloud is a gas cloud within a galactic halo moving at a high velocity, e.g., local standard of rest velocities in the 70-90 km/s range and with masses ranging up to millions of solar masses. They're largely observed within the Milky Way (such as the Magellanic Stream and the Smith Cloud) and in other nearby galaxies.

The term intermediate-velocity cloud (IVC) is also used for similar clouds with significant motion but somewhat lower velocity.

(cloud type,halo)
Further reading:

Referenced by pages:
galactic halo
Magellanic Stream
Smith Cloud