Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-01-11
Astronomy and Astrophysics
Astrophysics
6 pages, Proceedings of the International Symposium "High Energy Gamma-Ray Astronomy", 26-30 July 2004, Heidelberg, Germany
Scientific paper
10.1063/1.1878454
We analyze how the spectrum of synchrotron and inverse Compton radiation from a narrow relativistic jet changes with the observation angle. It is shown that diversity of acceleration mechanisms (in particular, taking the converter mechanism (Derishev et al. 2003) into account) allows for numerous modifications of the observed spectrum. In general, the off-axis emission in GeV-TeV energy range appears to be brighter, has a much harder spectrum and a much higher cut-off frequency compared to the values derived from Doppler boosting considerations alone. The magnitude of these effects depends on the details of particle acceleration mechanisms, what can be used to discriminate between different models. One of the implications is the possibility to explain high-latitude unidentified EGRET sources as off-axis but otherwise typical relativistic-jet sources, such as blazars. We also discuss the broadening of beam pattern in application to bright transient jet sources, such as Gamma-Ray Bursts.
Aharonian Felix A.
Derishev Evgeny V.
Kocharovsky Vl. V.
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