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

• 来源期刊: 天文和天体物理学研究
• 年，卷（期）: 2016,（1）
• 页码范围: 175-189
• 页数: 15页
• 语种: 英文
• DOI: 10.1088/1674-4527/16/1/020

摘要

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 supeduminal 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.