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The influence of collimation on the appearance of relativistic jets

Published online by Cambridge University Press:  24 February 2011

Pierre-Olivier Petrucci ,
Timothe Boutelier  and
Gilles Henri
Pierre-Olivier Petrucci
Affiliation:
Laboratoire d'Astrophysique de GrenOble, Université Joseph Fourier - Grenoble 1 / CNRS UMR 5571, BP 53, 38041 Grenoble Cedex 09, France email: pierre-olivier.petrucci@obs.ujf-grenoble.fr
Timothe Boutelier
Affiliation:
Laboratoire d'Astrophysique de GrenOble, Université Joseph Fourier - Grenoble 1 / CNRS UMR 5571, BP 53, 38041 Grenoble Cedex 09, France email: pierre-olivier.petrucci@obs.ujf-grenoble.fr
Gilles Henri
Affiliation:
Laboratoire d'Astrophysique de GrenOble, Université Joseph Fourier - Grenoble 1 / CNRS UMR 5571, BP 53, 38041 Grenoble Cedex 09, France email: pierre-olivier.petrucci@obs.ujf-grenoble.fr
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Abstract

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The question of the collimation of relativistic jets is the subject of a lively debate in the community. We numerically compute the apparent velocity and the Doppler factor of a non homokinetic jet using different velocity profile, to study the effect of collimation on the appearance of relativistic jets (apparent velocity and Doppler factor). We argue that if the motion is relativistic, the high superluminal velocity are possible only if the geometrical collimation is smaller than the relativistic beaming angle γ−1. In the opposite case, the apparent image will be dominated by the part of the jet traveling directly towards the observer resulting in no apparent velocity. Furthermore, getting rid of the homokinetic hypothesis yields a complex relation between the observing angle and the Doppler factor, resulting in important consequences for the numerical computation of AGN population and unification scheme model.

Keywords

galaxies: active – BL Lacertae objects: individual: – galaxies: jets – gamma-rays: theory – radiation mechanisms: non-thermal
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S275: Jets at all Scales , September 2010 , pp. 122 - 125
Copyright
Copyright © International Astronomical Union 2011

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