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Distortion Effects in BL Lac Radio Jets

Published online by Cambridge University Press:  25 May 2016

H. Sol ,
S. Appl  and
L. Vicente
H. Sol
Affiliation:
1 DARC, UPR176 du CNRS, Observatoire de Paris-Meudon, 92195 Meudon – France
S. Appl
Affiliation:
2 Observatoire Astronomique, 11 rue de l'Université, 67000 Strasbourg – France
L. Vicente
Affiliation:
1 DARC, UPR176 du CNRS, Observatoire de Paris-Meudon, 92195 Meudon – France

Extract

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BL Lac objects often show a quite distorted radio morphology. Almost 75% of the BL Lacs for which the information is available show an apparent misalignment angle ΔPA between the VLBI jet and the large scale radio structure larger than 45 degrees. This can be explained by strong enhancement of slight bending due to projection effects, especially if BL Lacs are the most highly beamed sources. However we recently performed a statistical analysis of misalignment angle histograms for 155 extragalactic radio sources of different types and found that the intrinsic distortion is significantly more important in BL Lacs than in quasars and even CSS sources. Indeed the best fits of the δPA histograms by a simple bend model correspond to γɸ = 123° for BL Lacs, 37° for quasars and 36° for CSS sources, where ɸ and γ are the jet typical intrinsic bend and Lorentz factor within a given class of sources (Appl et al, 1995). If, as currently thought, jets in BL Lacs have smaller Lorentz factors than in quasars, high intrinsic bending and misalignment appear to be the rule in BL Lac sources.

Type
Radio Source Modelling and Emission Mechanisms
Information
Symposium - International Astronomical Union , Volume 175: Extragalactic Radio Sources , 1996 , pp. 477 - 478
Copyright
Copyright © Kluwer 1996 

References

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