continuum radiation

Continuum radiation in astronomy refers to electromagnetic radiation emitted across a broad range of frequencies, rather than at specific, discrete wavelengths. This type of radiation is produced by various astronomical objects and phenomena.12

One primary source is thermal radiation, emitted by any warm substance. The hotter an object, the more rapidly its charged particles move, leading to the emission of radiation across a continuous spectrum. Stars, like our Sun, emit continuum radiation due to the high temperatures of their surface gases.1

Another significant source is synchrotron emission, which occurs when electrons move at near-light speeds within magnetic fields. This process generates nonthermal radiation and is observed in objects like supernova remnants, pulsars, radio galaxies, and quasars. Additionally, bremsstrahlung, or "braking radiation," produced by the deceleration of charged particles, also contributes to continuum spectra, particularly in phenomena like X-ray generation.123