3D hydrodynamic simulations of large-scale precessing jets: radio morphology. Issue 4 (2nd October 2020)

• Record Type: Journal Article
• Authors: Horton, Maya A; Krause, Martin G H; Hardcastle, Martin J
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 499:Issue 4(2020)
• Page Start: 5765
• Page End: 5781
• Publication Date: 2020-10-02
• Subjects: black hole physics -- hydrodynamics -- methods: numerical -- galaxies: active -- galaxies: jets; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/staa3020
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: The prospect of relativistic jets exhibiting complex morphologies as a consequence of geodetic precession has long been hypothesized. We have carried out a 3D hydrodynamics simulation study varying the precession cone angle, jet injection speed, and number of turns per simulation time. Using proxies for the radio emission we project the sources with different inclinations to the line of sight to the observer. We find that a number of different precession combinations result in characteristic 'X' shaped sources which are frequently observed in radio data, and some precessing jet morphologies may mimic the morphological signatures of restarting radio sources. We look at jets ranging in scale from tens to hundreds of kiloparsecs and develop tools for identifying known precession indicators of point symmetry, curvature, and jet misalignment from the lobe axis and show that, based on our simulation sample of precessing and non-precessing jets, a radio source that displays any of these indicators has a 98 per cent chance of being a precessing source.