High velocity gas from the Galactic dark halo

Details High velocity gas from the Galactic dark halo High velocity gas from the Galactic dark halo

1998-11-13

arxiv.org/abs/astro-ph/9811209v1

Astronomy and Astrophysics

Astrophysics

7 pages, 1 figure, LaTeX (uses paspconf.sty) To appear in Proc. Stromlo Workshop on High Velocity Clouds (PASP)

Scientific paper

We present the germ of a new model for High Velocity Clouds, derived from the idea that the dark matter halo of our Galaxy is in the form of cold, planetary-mass gas clouds. In this picture HVCs arise as a result of disruptive collisions between dark matter clouds: high velocity atomic gas is a natural consequence of the dark halo kinematics, and is intimately associated with assembly of the visible Galaxy. Quasi-spherical halo models predict a broad 21 cm line background, together with a number of individually detectable, low-mass HVCs conforming to a particular velocity field. A halo model which incorporates satellite substructure -- after the fashion of the current paradigm of hierarchical structure formation -- includes both these components and, in addition, some massive HVCs. These latter HVCs are simply the wakes of the orbiting satellite halos, and each may have a mass up to 0.3% of the mass of the satellite.

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