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Large Bent Jets in the Inner Region of CSS

Published online by Cambridge University Press:  25 May 2016

F. Mantovani
Affiliation:
1 Istituto di Radioastronomia, Bologna, Italy
W. Junor
Affiliation:
2 Dept. of Astrophysycs, University of New Mexico, USA
M. Bondi
Affiliation:
1 Istituto di Radioastronomia, Bologna, Italy
L. Padrielli
Affiliation:
1 Istituto di Radioastronomia, Bologna, Italy
W. Cotton
Affiliation:
3 National Radio Astronomy Observatory, Charlottesville, USA
E. Salerno
Affiliation:
1 Istituto di Radioastronomia, Bologna, Italy

Extract

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Recently we focussed our attention on a sample of Compact Steep-spectrum Sources (CSSs) selected because of the large bent radio jets seen in the inner region of emission. The largest distortions are often seen in sources dominated by jets, and there are suggestions that this might to some extent be due to projection effects. However, superluminal motion is rare in CSSs. The only case we know of so far is 3C147 (Alef at al. 1990) with a mildly superluminal speed of ≃ 1.3v/c. Moreover, the core fractional luminosity in CSSs is ≃ 3% and ≤ 0.4% for quasars and radio galaxies respectively. Similar values are found for large size radio sources i.e. both boosting and orientations in the sky are similar for the two classes of objects. An alternative possibility is that these bent-jet sources might also be brightened by interactions with the ambient media. There are clear indications that intrinsic distortions due to interactions with a dense inhomogeneous gaseous environment play an important role. Observational support comes from the large RMs found in CSSs (Taylor et al. 1992; Mantovani et al. 1994; Junor et al. these proc.) and often associated with strong depolarization (Garrington & Akujor, t.p.). The CSSs also have very luminous Narrow Line Regions emission, with exceptional velocity structure (Gelderman, t.p.).

Type
Properties of Radio Sources
Copyright
Copyright © Kluwer 1996 

References

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