A helically twisted relativistic jet - Nonradial motions and accelerations in 3C 345

Astronomy and Astrophysics – Astronomy

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Quasars, Radio Jets (Astronomy), Relativistic Velocity, Acceleration (Physics), Kelvin-Helmholtz Instability

Scientific paper

The radio source 3C 345 has a curved, inner-jet structure consisting of three components. Components C2 and C3 appear to be moving with βapp ≡ 17 and 13, respectively, along approximately parallel straight-line trajectories with motion along a mean direction ≡-75°. Component C4 recently appeared at a position angle ≡-135° and has exhibited nonlinear motion and apparent acceleration from βapp ≡ 4 - 10 over a period of about 2 years with motion along a mean direction <-75°. The author shows how the motions of C4 can be explained by a feature that is propagating with constant speed along a helically twisted jet in which the wavelength of the helix increases in proportion to jet's radius. This form for a helical twist is predicted by the linearized fluid-dynamical equations, which can be used to describe the response of a light jet to helical distortion.

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