The evolution of expanding nonthermal sources. II - Relativistic expansion

Astronomy and Astrophysics – Astronomy

Scientific paper

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Hydrodynamics, Nonthermal Radiation, Optical Thickness, Radio Sources (Astronomy), Relativistic Effects, Thermal Expansion, Astronomical Models, Flux Density, Linearity, Opacity

Scientific paper

A hydrodynamical treatment of radio-source models expanding relativistically into vacuum is presented. Both a linear and a spherical geometry are considered. The time evolution of the flux density is computed for sources which initially are optically thick and upon expansion become optically thin as well as for sources which are initially and at all times optically thin. The spectral evolution is also shown. The results are compared with those for nonrelativistic models and for relativistic homogeneous models. It is found that apparent superluminal motion is observable only for the linear models and not for the cases of spherical expansion.

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