NONTHERMAL RADIATION - Radiation the characteristics of which do not depend on the temperature of the source. There are three common types non-thermal radiation in astronomy.
nonthermal radiation - (n.)
Radiation that cannot be characterized by a single number (the temperature). Normally, we derive this number from Planck's law, so that radiation that does not follow Planck's law is called nonthermal.
nova - (n.) ...
Other types of active galaxies show a mixture of thermal and nonthermal radiation, so it is more difficult to study the nonthermal radiation alone.
synchrotron radiation Type of nonthermal radiation caused by high-speed charged particles, such as electrons, emitting radiation as they are accelerated in a magnetic field. [More Info: Field Guide] ...
BL Lac Object (also Blazar): A type of active galaxy characterized by very rapid (day to day) variability by large percentages in total luminosity, no emission lines, strong nonthermal radiation, and starlike appearance.
Blackbody radiation; radiation caused by the high temperature of the radiating objects, as opposed to nonthermal radiation, which is caused by energetic (not necessarily hot) electrons. [H76]
Thermalization ...
Radiation emitted by energetic particles for reasons other than high temperature of the source. The spectrum of nonthermal radiation is different from that predicted by Planck's law for a blackbody. [H76]
Nordtvedt Effect ...
If the most powerful radio galaxies, seen to large redshift, are to be identified with normal elliptical galaxies seen at more recent epochs, and if their colors are generally dominated by starlight and not scattered nonthermal radiation, ...
radiation is not dependent on the temperature of a given astronomical source; a relatively cool object can release substantial amounts of electromagnetic energy in this form. Synchrotron radiation is thus often termed nonthermal radiation.
Nonthermal Radiation Radiation emitted by nonthermal electrons.
Nucleus The positively charged core of an atom, consisting of protons and neutrons (except for hydrogen), around which electrons orbit.
 See also: Norma, Universe, Gravitation, Solar, Galaxy
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