Open AccessElectromagnetic fields in jets
Author(s) -
Sherwin B. D.,
LyndenBell D.
Publication year - 2007
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2007.11791.x
Subject(s) - physics , jet (fluid) , poynting vector , magnetic field , field line , astrophysical jet , accretion (finance) , rotation (mathematics) , astrophysics , differential rotation , mechanics , field (mathematics) , classical mechanics , computational physics , geometry , active galactic nucleus , mathematics , quantum mechanics , galaxy , pure mathematics
The magnetic fields and energy flows in an astronomical jet described by our earlier model are calculated in detail. Though the field distribution varies with the external pressure function p ( z ) , it depends only weakly on the other boundary conditions. Individual field lines were plotted; the lines become nearly vertical at the bottom and are twisted at the top. An animation of a field line's motion was made, which shows the line being wound up by the accretion disc's differential rotation and rising as a result of this. The distribution of Poynting flux within the jet indicates that much of the energy flows up the jet from the inside of the accretion disc but a substantial fraction flows back down to the outside.