Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...220..756v&link_type=abstract
Astrophysical Journal, Part 1, vol. 220, Mar. 15, 1978, p. 756-771.
Astronomy and Astrophysics
Astronomy
12
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.
Pacini Franco
Vitello Peter
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