The implications of helical patterns in 3C 120

Details The implications of helical patterns in 3C 120 The implications of helical patterns in 3C 120

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003newar..47..645w&link_type=abstract

New Astronomy Reviews, Volume 47, Issue 6-7, p. 645-647.

Astronomy and Astrophysics

Astronomy

Galaxies: Individual (3C 120), Galaxies: Jets, Galaxies: Active, Radio Continuum: Galaxies, Hydrodynamics, Relativity

Scientific paper

Ongoing monitoring observations of the 3C 120 radio jet with the VLBA at 1.7 GHz show a pattern and motions that suggest that the internal jet structure is helical with a long wavelength [ApJ 556 (2001) 772]. The pattern is stationary or slowly moving with features moving through it at apparent superluminal speeds. Physical theory and numerical simulation of jets show that the helical patterns are an expected result in many circumstances as a result of perturbations to the jet such as jet-cloud collision or precession. The wavelength and pattern speed of such structures are related to the internal sound speed and Lorentz factor and to the external sound speed. The internal jet structure expected from the theory suggests that the pattern will have a wider opening angle than the trajectories of individual particles. This helps avoid a requirement for extreme conditions when interpreting the appearance of the jet in terms of relativistic beaming.

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