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Non-thermal emission is electromagnetic radiation emission not due to the heat (temperature) of the source (e.g., an astronomical object), i.e., emission other than thermal emission. It is recognized through spectral features that suggest something other than the black-body radiation. The term can be used for radiation that has been modified such that it no longer has the spectral energy distribution (SED) associated with thermal radiation (but the presence of spectral lines is not sufficient to classify a spectrum as non-thermal). Among the non-thermal emission mechanisms: