Transverse stability of relativistic twocomponent jets

1
Transverse stability of relativistic
two-component jets

• Zakaria Meliani and Rony Keppens

CPA- Katholieke Universiteit Leuven
2
Jet in AGN
Active Galactic Nuclei
10 AGN 'radio-loud' extended
/ compact jets aligned up to Mpc
Accretion disk ? 5-30 L 1043- 1048
erg/s
3
Jet launching

• Transport of angular momentum

Model

• Ejection from disk

Jet

• Ejection from star

wind
Results
The energy and angular Momentum is extract by
jet and wind
FOM-Institute for Plasma Physics Rijnhuizen
Zakaria Meliani
4
Rotation in the jet
Observations
Magnetic field
The jet speed increase toward the axis
The jet has two component.
Zakaria Meliani
5
Two-component outflow
Theories/Observations
The transverse variation
Inner wind
Outer jet
V Vesc (2 G M/R) ? faster outflow is launched
closer to the axis
6
Model
Inner wind
Outer jet
Model
2/3 of jet section
1/3 of jet section
Fast
Slow
0.1 of total energy
99.9 of total energy
Total energy flux 1046 ergs/s
The same amount of angular momentum is extracted
by the inner wind and outer jet
Rotation profile
7
Acoustic waves (1D )
Transfer of angular momentum and energy
Acoustic waves dont disturb the outer jet
8
Two-component jet ( 2.5D )
9
Results
The under-dense wind is disturb
Simulations
Body mode
Surface mode
Acoustic waves
Formation of shear region
Wind deceleration
External jet collimate the jet
10
Time evolution
Inner wind
Outer jet
Shear region
T0
T5
11
Conclusion

• The interaction between two components induces
  the development of shear region.

• Two-component jet model explains
• The jet deceleration in subpc-scale in FR I
• The jet decollimations.