Synchrotron emission from bent shocked relativistic jets. 3: Aberration of light and time delay effects

Details Synchrotron emission from bent shocked relativistic jets. 3: Aberration of light and time delay effects Synchrotron emission from bent shocked relativistic jets. 3: Aberration of light and time delay effects

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...292...33g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 292, no. 1, p. 33-44

Statistics

Computation

34

Computational Astrophysics, Elastic Bending, Emission, Magnetic Fields, Plasma Jets, Relativistic Theory, Shock Fronts, Shock Waves, Synchrotron Radiation, Aberration, Astronomical Models, Computerized Simulation, Numerical Analysis, Three Dimensional Models, Time Lag

Scientific paper

We present numerical results of a computer code which solves the transfer equation for the synchrotron radiation in extragalactic relativistic jets with bends and shock waves. We consider for the first time the influence on the emission of bent jets by two relativistic effects: aberration of light and time delays. We show that the importance of aberration effects depends on the degree of randomly oriented magnetic field within the jet, being null for jets with a completely randomly oriented magnetic field. We study the consequences of including time delays in bent shocked jets with diverging flow through a three dimensional numerical simulation. The time delay produces rotations and deformations of the shock fronts when viewed in the observer's frame, which result in variations of the length of the shocked region and of the apparent relative velocity between different fluid lines. Hence the emission, in particular the linearly polarized flux density, associated with the shocked region is strongly altered. We present numerical results which compare those obtained before and after taking into account both effects for a particular shocked, helical model jet, and show that the corrections are especially important in the polarized flux density.

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