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Two-Component jets and the Fanaroff-Riley Dichotomy. CPA, KULeuven, Belgium. Zakaria Meliani. Rony Keppens (CPA- KU Leuven), Christophe Sauty (Observatoire de Paris). Active galactic nuclei dichotomy. Cygnus A VL A. Fanaroff-Riley I I Hot Spots dominated “ classical doubles ”.

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two component jets and the fanaroff riley dichotomy

Two-Component jets and the Fanaroff-Riley Dichotomy

CPA, KULeuven, Belgium

Zakaria Meliani

Rony Keppens (CPA- KU Leuven), Christophe Sauty (Observatoire de Paris)

MPIfRA

slide2

Active galactic nuclei dichotomy

Cygnus A

VLA

Fanaroff-RileyII

Hot Spots dominated

“classical doubles”

central engine factor?

Fanaroff-Riley I

jet dominated

3C 449

VLA

MPIfRA

active galactic nuclei jet
Active galactic nuclei jet
  • Aligned up to Mpc
  • Accretion disk
  • v ~ 0.94-0.9994

Observations

Accretion disk

MPIfRA

models two component outflow
Models (Two-component outflow)
  • Fast- low density inner wind
  • Observations in high energy :
  • Observations in radio :
  • Slow- low density outer flow

Differential rotation

MPIfRA

jet launching
Jet launching
  • Ejection from disk

Jet

  • Ejection from inner corona

wind

Results

The energy and angular

Momentum is extract by jet and wind

Meliani, Casse, Sauty, 2006

MPIfRA

3d two component jet
3D Two-component jet

3D High energy flux inner jet

Jet remains relativistic and collimate

Fast growing of RT instabilities

3D Low energy flux inner jet

Logarithm of the commoving frame density

MPIfRA

high energy flux inner flow
High energy flux inner flow

Logarithm of the commoving frame density

MPIfRA

interface stability
Interface stability

Pressure

Centrifugal force

Rotation

Centrifugal force - pressure equilibrium can be instable

Angular momentum extraction from the inner jet

Analogous of Rayleigh-Taylor instability

MPIfRA

conclusion
Conclusion
  • Two-component jet models could use to explain the classification of the Fanaroff-Riley radio source
    • Outflows with high energy flux inner component decelerate and de-collimate
    • Outflows with low energy flux inner component remain collimate and relativistic

MPIfRA

rotation in the jet
Rotation in the jet

Jet rotation

The jet speed increase toward the axis

The jet has two component.

Bacciotti et al. 2002

MPIfRA

two component outflow
Two-component outflow

Hot – rarefied –turbulent

Cold – dense - collimated

“Onion-like” structure

slow sheath around fast core

Jet-wind interaction

The transverse variation

Inner wind

Outer jet

V ~ Vesc→ faster outflow is launched closer to the axis

MPIfRA

transverse cross section 2 5d
Transverse cross-section (2.5D)

Case I

Low energy flux inner flow 5%

Case II

High energy flux inner flow 30%

Modeling

MPIfRA

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