Vol 16, No 1 (2016) / Qian

Non-ballistic motion and precessing helical trajectory in quasar NRAO 150

Shan-Jie Qian

Abstract

NRAO 150 is a very special radio quasar in which prominent non-ballistic superluminal motion has been observed in its inner-jet region. We apply model-fittings to the kinematics of the superluminal knots (trajectory, distance from the core and apparent velocity) in terms of a helical precessing jet-nozzle model. Five cases are considered in which the angle between the jet axis and the line of sight is assumed to be 6°, 3°, 1°, 0.6° and 0.12°, respectively. It is shown that the superluminal components have intrinsic acceleration in the innermost regions ( ≲ 0.2 mas from the core). The phenomenon of precessing nozzle/trajectory can be understood on the basis of relativistic magnetohydrodynamic theories for relativistic jets.

Keywords


radio continuum: galaxies — galaxies: jets — galaxies: kinematics — galaxies: individual (quasar NRAO 150)

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DOI: https://doi.org/10.1088/1674–4527/16/1/020

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