Gas Between the Stars: What Determines its Temperature?
The interstellar gas in galaxies is heated by stellar radiationand cosmic rays and it also cools through radiation. We takea detailed look at these processes in order to understand thethermal state of equilibrium of the interstellar gas. This gasalso manifests itself in different ‘phases’– molecular, neutralatomic and ionized, each with its characteristic temperatureand density, which we attempt to understand.
Volume 25 | Issue 6