Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...238..539b&link_type=abstract
Astrophysical Journal, Part 1, vol. 238, June 1, 1980, p. 539-545.
Astronomy and Astrophysics
Astrophysics
9
Astronomical Models, Galactic Nuclei, Radio Galaxies, Synchrotron Radiation, X Ray Sources, Compton Effect, Dense Plasmas, Electron Distribution, High Energy Electrons, High Temperature Plasmas, Plasma Density, Radio Emission, Relativistic Particles
Scientific paper
A model is proposed for the radio and X-ray variability of the nucleus of Centaurus A in which an adiabatically expanding plasma containing a power-law distribution of relativistic electrons produces the radio flux by synchrotron emission, and the X-ray flux by inverse Compton scattering of an ambient distribution of thermal photons. The variability of Centaurus A is shown to be consistent with the expansion of an initially opaque, hot (1000-10,000 K) plasma which eventually becomes optically thin. Radio flares without corresponding X-ray flares are possible in this model because the plasma density decreases during the expansion, allowing radio radiation previously absorbed or suppressed to be observed. Some consequences of the model for the physical environment in galactic nuclei are discussed.
Beall J. H.
Rose William K.
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