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| Paper: |
Cold Atomic Gas in the CGPS and Beyond |
| Volume: |
438, The Dynamic Interstellar Medium: A Celebration of the Canadian Galactic Plane Survey |
| Page: |
111 |
| Authors: |
Gibson, S. J. |
| Abstract: |
The Canadian Galactic Plane Survey has opened new vistas on the Milky Way,
including cold hydrogen clouds that bridge a critical gap between the
classical diffuse interstellar medium and the gravitationally bound molecular
clouds that can form stars. The CGPS and its fellow IGPS surveys revealed
these transitional clouds to be surprisingly widespread as HI
self-absorption (HISA) shadows against the Galactic HI emission
background. The richness of the IGPS data allows detailed examination of
HISA cloud spatial structure, gas properties, Galactic distribution, and
correspondence with molecular gas, all of which can constrain models of cold
HI clouds in the evolving interstellar medium. Augmenting the
landmark IGPS effort are new and upcoming surveys with the Arecibo 305m and
Australian SKA Pathfinder telescopes. |
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