Effect of Orientation on the Variability Pattern of Gamma-Ray Sources |
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| Authors: | Amir Levinson |
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| Institution: | (1) School of Physics and Astronomy, Tel Aviv University, Tel Aviv, 69978, Israel |
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| Abstract: | Using a toy model, we demonstrate how the variability pattern of a relativistically moving source of radiation that is subject
to the action of a transient force, depends on dynamical effects. The model is motivated by a recent analysis of radiative
fronts in magnetized, relativistic jets, but is applicable also in other situations. The main effect analyzed in this paper
is the strong dependence of the variability pattern on viewing angle, resulting from changes of the beaming cone of emission.
In particular, it is shown that(1) the shape of the light curves reflects the time profile of the Doppler factor when viewing
the source at large enough angles to its direction of motion, whereas at small viewing angles it is determined by the time
evolution of the radiated power density; and(2) the characteristics of correlated emission depend strongly on viewing angle
by virtue of either optical depth effects or the difference in beaming patterns of different radiation sources.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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