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celestial radio emissions
There are three main types of celestial radio emissions:
  1. Thermal emissions which occur as a result of the acceleration of electrically-charged particles in a hot gas.
  2. Synchrotron or non-thermal, emissions are produced by the acceleration of charged particles, but the acceleration is caused by a magnetic field.
  3. Radio spectral-line emissions are concentrated in a narrow band around one specific frequency; just as an optical spectral line corresponds to a single frequency in the visible electromagnetic spectrum.

    4. Radio line emissions usually originate in clouds of hydrogen gas, a relatively common constituent of the universe, which is found in our galaxy's spiral arms, among other places.

This entry is located in the following unit: Astronomy and related astronomical terms (page 6)