Computer Science
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994stin...9433917k&link_type=abstract
Unknown
Computer Science
Active Galactic Nuclei, Cerenkov Radiation, Compton Effect, Cosmic Dust, Electron Beams, Raman Spectra, Dielectrics, Electromagnetic Fields, Infrared Radiation, Refractivity
Scientific paper
An electron moving with a superluminal velocity in a dielectric medium gives rise to spontaneous Cerenkov radiation. If, instead of a single electron, a high density superluminal electron beam is made to pass through a dielectric, the spontaneously generated radiation will grow exponential with distance and is known as stimulated Cerenkov-Compton radiation. If, in addition, an incident electromagnetic field interacts with a strong superluminal or subluminal electron beam, a frequency up-converted stimulated scattered radiation is produced, which by analogy to a similar process in vacuum with subluminal electron beams is known as Cerenkov-Raman radiation. We explore and point out the role of these processes in the dust environs of active galactic nuclei (AGN). Since the refractive index of the dust matter is a key factor in these processes, their inclusion links the properties of the dust grains with the characteristics of the nonthermal continuum especially in the infrared range, which the observations show to be particularly bumpy and therefore requires additional contributions over the thermal continuum.
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