Article

# Radio Emission from 3D Relativistic Hydrodynamic Jets: Observational Evidence of Jet Stratification

11/1999; DOI:doi:10.1086/312436
Source: arXiv

ABSTRACT We present the first radio emission simulations from high resolution three dimensional relativistic hydrodynamic jets, which allow for a study of the observational implications of the interaction between the jet and external medium. This interaction gives rise to a stratification of the jet where a fast spine is surrounded by a slow high energy shear layer. The stratification, and in particular the large specific internal energy and slow flow in the shear layer largely determines the emission from the jet. If the magnetic field in the shear layer becomes helical (e.g., resulting from an initial toroidal field and an aligned field component generated by shear) the emission shows a cross section asymmetry, in which either the top or the bottom of the jet dominates the emission. This, as well as limb or spine brightening, is a function of the viewing angle and flow velocity, and the top/bottom jet emission predominance can be reversed if the jet changes direction with respect to the observer, or presents a change in velocity. The asymmetry is more prominent in the polarized flux, because of field cancellation (or amplification) along the line of sight. Recent observations of jet cross section emission asymmetries in the blazar 1055+018 can be explained assuming the existence of a shear layer with a helical magnetic field. Comment: 6 pages, 5 figures, 1 latex style file, ApJL accepted

0 0
·
0 Bookmarks
·
22 Views

Available from

### Keywords

1 latex style

5 figures

aligned field component

cross section asymmetry

external medium

fast spine

field cancellation

helical magnetic field

initial toroidal field

jet changes direction

large specific internal energy

magnetic field

polarized flux

Recent observations

section emission asymmetries

shear layer

spine brightening

top/bottom jet emission predominance

viewing angle