A.V. Chernoglazov Moscow Institute of Physics and Technology with

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Presentation transcript:

On the internal structure of relativistic jets collimated by ambient pressure A.V. Chernoglazov Moscow Institute of Physics and Technology with V.S. Beskin, A.M. Kiselev and E.E. Nokhrina HEPRO-6 Moscow, 2017

Internal structure – AGN New possibilities MOJAVE team (time) Radioastron (base)

Internal structure – AGN Y.Y.Kovalev et al, ApJ, 668, L27 (2007)

VLBA+VLA1, 15 GHz The inner jet structure is clearly resolved, a short counter jet is detected Y.Y.Kovalev et al, ApJ, 668, L27 (2007)

F.Mertens et al, Astronomy & Astrophysics, 595, 20 (2016) Not a free outflow – ambient pressure is to play an important role F.Mertens et al, Astronomy & Astrophysics, 595, 20 (2016)

Collimation J. C. McKinney, A. Tchekhovskoy, R. D. Blandford Collimation J.C.McKinney, A.Tchekhovskoy, R.D.Blandford. MNRAS, 423, 3083 (2012) Parabolic?

force-free solution Current sheet (as a cheat) Electric current inside a magnetosphere F.C.Michel, ApJ, 180L, 133 (1973) force-free solution Current sheet (as a cheat)

parabolic solution current changes its direction Electric current inside a magnetosphere R.D.Blandford and R.L. Znajek, MNRAS, 179, 433 (1977) parabolic solution current changes its direction

Electric current inside a magnetosphere R. D. Blandford and R. L Electric current inside a magnetosphere R.D.Blandford and R.L. Znajek, MNRAS, 179, 433 (1977) parabolic solution

Electric current inside a magnetosphere R. D. Blandford and R. L Electric current inside a magnetosphere R.D.Blandford and R.L. Znajek, MNRAS, 179, 433 (1977) parabolic solution What is here?

On current closure region Magnetic tower Bromberg et al, ApJ, 740, 100 (2011)

A back view O.Porth et al, ApJ, 737, 42 (2011)

Our task There is neither current sheet nor external magnetic field Velocity of particles and magnetic fields are null Flow is supersonic

Grad-Shafranov approach Bernoulli equation

Grad-Shafranov approach Bernoulli equation

Grad-Shafranov approach 5 arbitrary “integrals of motion”: 1) angular velocity 2) z-component of the angular momentum flux 3) particle-to-magnetic flux ratio 4) relativistic entropy 5) energy flux

Example of solution Radius of the jet

About properties of GS equations

About properties of GS equations

On the importance of integral H It’s useful to introduce dimensionless parameter

The newest insight

The newest insight Let’s compare the results

Calculations Michel magnetization parameter (maximal bulk Lorentz-factor)

And the result

The end