Large Bent Jets in the Inner Region of CSS [chapter]

F. Mantovani, W. Junor, M. Bondi, L. Padrielli, W. Cotton, E. Salerno
1996 Extragalactic Radio Sources  
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
more » ... ractional 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.). Our investigation We are investigating a sample of sources showing large bent jets on the mas scale. Table 1 lists the selected sources. It is possible that these are extreme 71 R. Ekers et al. (eds.), Extragalactic Radio Sources, 71-72.
doi:10.1007/978-94-009-0295-4_27 fatcat:pooaffp6ovftbffup62im2do6i