Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...482l..33g&link_type=abstract
Astrophysical Journal Letters v.482, p.L33
Astronomy and Astrophysics
Astronomy
97
Galaxies: Jets, Hydrodynamics, Radiation Mechanisms: Nonthermal, Relativity
Scientific paper
We present numerical simulations of the generation, evolution, and radio emission of superluminal components in relativistic jets. We perform the fluid dynamical calculations using a relativistic time-dependent code based on a high-resolution shock-capturing scheme, and then we calculate the radio emission by integrating the transfer equations for synchrotron radiation. These simulations show that a temporary increase in the flow velocity at the base of the jet produces a moving perturbation that contains both a forward and a reverse shock and is trailed by a rarefaction. The perturbation appears in the simulated maps as a region of enhanced emission moving downstream at a superluminal apparent velocity. Interactions of the perturbation with the underlying steady jet result in changes in the internal brightness distribution of the superluminal component, which are manifested as low-level fluctuations about the long-term evolution of both the apparent velocity and the exponential decay of the light curves.
Alberdi Antonio
Gomez Jos'e L.
Ibanez Jose M. A.
Marscher Alan P.
Marti Jose M. A.
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