Anisotropies in relativistic jets - Beaming patterns for synchrotron and inverse-Compton emission

Astronomy and Astrophysics – Astronomy

Scientific paper

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Anisotropy, Compton Effect, Inverse Scattering, Radio Jets (Astronomy), Relativistic Particles, Synchrotron Radiation, Angular Distribution, Optical Thickness, X Ray Sources

Scientific paper

We consider various forms of anisotropy in the angular distributions of relativistic electrons and photons in a jet with bulk relativistic velocity. Even if electrons are isotropic in a frame moving with some velocity, at optically thin frequencies (which dominate the radiation energy density) the synchrotron radiation field is not isotropic in that or any other frame, for most jet models. We exhibit the angular dependence of the synchrotron radio emission and inverse-Compton X-ray emission for simple jet models, and show that even for these oversimplified cases the assumption that this angular dependence can be described as some power of the Doppler factor is rather poor, for any value of that power. In addition, the X-ray flux does not have the same angular distribution as the radio flux, but is somewhat broader.

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