Magnetic Field is the secret behind the mysterious power ...
Transcript of Magnetic Field is the secret behind the mysterious power ...
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Magnetic Field is the secret behind the mysterious power of the universe.
black hole jet a=0.1
A story about "making"
a jet or a lightsaber.
Chen & Zhang 2021, ApJ, 906, 105
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Analytical Solution of Magnetically Dominated Jet/Wind:
jet launching, acceleration and collimation
Liang Chen (陈亮, SHAO)
collaborator: Bing Zhang
Chen & Zhang 2021, ApJ, 906, 105@ TSINGHUA (2021.03.25)
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Astrophysical jets
AGN
GRB
pulsar
X-ray binary
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Astrophysical jets – M87
Blandford et al. 2019; EHT Collaboration 2021
collimation : ~10^6 (~10^10)
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Astrophysical jets
• superluminal motion
Jorstad et al. 2005
• geometrical effect → relativistic
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• Stage I:• collimating
• accelerating
• “quasi-parabolic”
• Stage II:• “collimating”
• “conical”
• “Stage III”• terminal, lobe
Astrophysical jets
Stage I
Stage II
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• Relativistic (Г~100)
• Collimation (θ~1o)
• Propagating scale many order of magnitude (~1010 Rg)
• Variability
• Broadband wavelength emissions
• Polarization
• …
Astrophysical jets
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Astrophysical jets: problems
• Jet launching, acceleration, collimation
• Energy dissipation and particle acceleration
• Radiative processes vs. observations
• …
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Astrophysical jets: problems
• Jet launching, acceleration, collimation
• Energy dissipation and particle acceleration
• Radiative processes vs. observations
• …
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Astrophysical jets: problems
• Magnetic centrifugal force
• Magnetic pressure gradient force
• Pinch force
• Jet launching, acceleration and collimation
numerical versus quantitative analytical
• Explain observations of jets (e.g., VLBI data)
magnetically driven (BZ/BP)
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Astrophysical jets: magnetically driven jet
• Magnetospherestellar wind (Chandrasekhar,…), pulsar (Goldreich & Julian,…), MHD
• Numerical simulation (Narayan, Yuan, Tchekhovskoy, McKinney, Mizuno, Bai,…), semi-analysis (Blandford, Narayan, Spruit,
Cao, Contopoulos, Huang,…)
• Analytical• Type I: assume magnetic field configuration (Spruit, Cao,…)
• Type II: asymptotic properties (Beskin, Lyubarsky, Komissarov, Narayan, Tchekhovskoy,…)
• Type III: monopolar, cylindrical, parabolic (Michel, Blandford,…)
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A global jet theory should satisfy
• physically (mathematically) reasonable
• cover from non-relativistic to relativistic regime
• match observations and previous theoretical results
• explicitly analytical and comprehensive
• can be approximate, but should be accurate enough
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A global jet theory should satisfy
• physically (mathematically) reasonable
• cover from non-relativistic to relativistic regime
• match observations and previous theoretical results
• explicitly analytical and comprehensive
• can be approximate, but should be accurate enough
Chen & Zhang 2021, ApJ, 906, 105
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• S1: introduction
Part I: the equation and its solution• S2: the equation• S3: the solution
Part II: jet/wind properties• S4: magnetic field configuration• S5: flow velocity and acceleration• S6: current, charge, jet power and
electric potential difference• S7: jet dynamics and flow density• S8: black hole jet• S9: CO/AD as a boundary• S10: stability• S11: conclusions & Summary
Content
Appendix
• A1: the relation
• A2: magnetic field direction and amplitude
• A3: exact solutions
• A4: asymptotic behavior
• A5: magnetic field 3D morphology
• A6: jet flow neutrality?
• A7: the maximum Lorentz factor
• A8: black hole charge
• A9: formulae in Gaussian units
Chen & Zhang 2021, ApJ, 906, 105
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• S1: introduction
Part I: the equation and its solution• S2: the equation• S3: the solution
Part II: jet/wind properties• S4: magnetic field configuration• S5: flow velocity and acceleration• S6: current, charge, jet power and
electric potential difference• S7: jet dynamics and flow density• S8: black hole jet• S9: CO/AD as a boundary• S10: stability• S11: conclusions & Summary
Content
Appendix
• A1: the relation
• A2: magnetic field direction and amplitude
• A3: exact solutions
• A4: asymptotic behavior
• A5: magnetic field 3D morphology
• A6: jet flow neutrality?
• A7: the maximum Lorentz factor
• A8: black hole charge
• A9: formulae in Gaussian units
Chen & Zhang 2021, ApJ, 906, 105
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S2: the governing equation: axisymmetric, steady, no-GR
the “pulsar” equation (established 1960s)
𝐸
𝐵
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How does nature work? (I)
• Simulation: BH rotating slow or fast produce similar jet configuration (Tchekhovskoy, McKinney & Narayan 2008)
• by chance? physical? implication?(twisted magnetic field, velocity)
• If real, rotating to be very small (~vanish), similar configuration
• Math expect: two terms (equations): non-rotating and rotating
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How does nature work? (II)
rotating
if real
SEEMS STRANGE! do not have to be equal to 0 simultaneously!
non-rotating
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How does nature work? (III)
• Unless the nature works in a “subtle” way
• No expectation
• A surprise
• two solutions match each other!
• both are analytical!
rotating
non-rotating
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S3: an approximate solution: rotating term
• , magnetic flux, the natural boundary: vanish at
• angular velocity, the ansatz ( threading CO; threading AD)
• , the enclosed current ( )
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S3: an approximate solution: rotating term
• component solution
• component ( , )spherical/cylindrical coordinate
• at :
magnetic flux conservation
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S3: an approximate solution: rotating term
• component ( , )
Hypergeometric function
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S3: an approximate solution: non-rotating term
• solution
• at :
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S3: an approximate solution
•
•
•
•
• error
not significant depend on
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S3: an approximate solution
• apply:
• independent on angular velocity
• self-similar approach: a natural solution!power law dependence on radius:
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• S1: introduction
Part I: the equation and its solution• S2: the equation• S3: the solution
Part II: jet/wind properties• S4: magnetic field configuration• S5: flow velocity and acceleration• S6: current, charge, jet power and
electric potential difference• S7: jet dynamics and flow density• S8: black hole jet• S9: CO/AD as a boundary• S10: stability• S11: conclusions & Summary
Content
Appendix
• A1: the relation
• A2: magnetic field direction and amplitude
• A3: exact solutions
• A4: asymptotic behavior
• A5: magnetic field 3D morphology
• A6: jet flow neutrality?
• A7: the maximum Lorentz factor
• A8: black hole charge
• A9: formulae in Gaussian units
Chen & Zhang 2021, ApJ, 906, 105
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S4: magnetic field configuration
• magnetic stream surface (magnetic field line rotating surface)
“general paraboloid”
McKinney 2006
Asada & Nakamura 2012
Nakamura & Asada 2013
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S4: magnetic field configuration
• helical magnetic field
• magnetic field pitch angle
• Alfvén critical surface (light cylinder)
BH jet a=0.1
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S4: magnetic field configuration
• helical magnetic field
• magnetic field pitch angle
Moll 2009
• Alfvén critical surface (light cylinder)
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S4: magnetic field configuration – polarization
Attridge et al. 1999Pushkarev et al. 2005
degree cross jet angle cross jet
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S4: magnetic field configuration –
Park et al. 2019
Asada et al. 2002
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S4: magnetic field on AD (BP mechanism)
• Strength on AD
• Angle with AD mid-plane ( , <60 degree, BP)
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S4: magnetic field at McKinney & Narayan 2007
future observations
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S5: jet velocity & acceleration
• general velocity
• force-free: ignore inertia
• Poynting flux
• drift velocity (S7)
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S5: jet velocity & acceleration
• perpendicular to magnetic field
• individual components
BH jet a=0.1
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S5: jet velocity & acceleration
• causality constrain
Jorstad et al. 2005
• jet velocity versus opening angle
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S5: jet velocity & acceleration
• toroidal velocity
• poloidal velocity
ACS
• three stages
CCS
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S5: jet velocity & acceleration
BH jet a=0.1
three acceleration stages
AS I AS II AS III
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S5: jet velocity & acceleration
Marscher et al. 2010
polarization angle continuous changing
jet flow is helical
PKS 1510-089
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S5: jet velocity & acceleration
jet flow stratified:Poynting flux and Lorentz force
vanish on axis
BH jet a=1
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S6: current & charge
• jet flow has to be charged
The plasma supplies currents and charges as needed to support the electromagnetic field.
• electric force can be ignored in non-relativistic case
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S6: current & charge
McKinney & Narayan 2007
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S6: jet power & electric potential difference
• Hollow jetno Poynting flux on axis
Hada et al. 2016
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S6: jet power & electric potential difference
• Potential difference
• Jet power (between two layers)
• The CO case
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S6: jet power & electric potential difference
• jet current (3C 303)
• potential difference (Crab nebula)
Kronberg et al. 2011
Zhang et al. 2018
Amenomori et al. 2019Hester 2008
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S7: jet dynamics
𝐸
𝐵
Ƹ𝜈𝑑
• The force (I)
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S7: jet dynamics
𝐸
𝐵
Ƹ𝜈𝑑
• The force (I)
can not be exactly conserved!
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S7: jet dynamics
• The force (I)
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S7: jet dynamics
• The force (I)
“centripetal force” for plasma rotation and self-collimation highly magnetized jet self-balance
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S7: jet dynamics
• The force (II)
• magnetic pressure gradient force
• magnetic tension force
• electric force
acceleration: magnetic pressure gradient force
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S7: jet dynamics & flow velocity
• cold plasma
conserved qualities
magnetizationparameter
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• However, an exact conservation of prevents any acceleration!
S7: jet dynamics & flow velocity
(force-free condition applies)
• approximately conserved for highly magnetically dominated jet flow
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• cold plasma velocity ( )
S7: jet dynamics & flow velocity
• drift velocity
• the deviation
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S7: jet dynamics & flow velocity
• cold plasma velocity matches
the drift velocity very well
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S7: jet dynamics & flow density
• given an available mass flux per magnetic flux that still satisfies a highly magnetically dominated condition
• is proper density, measured in lab frame
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S8: black hole jet
• motion equation
• pseudo-Newtonian potential to measure GR effect (Artemova et al. 1996)
• magnetic force potential ( )
stagnation surface
Pu & Takahashi 2020
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S8: black hole jet
• BH angular velocity ( )
• constraint
McKinney & Narayan 2007
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S8: black hole jet
• AD angular velocity
• constraint
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S8: black hole jet
• jet properties
days - years
AGN: period, oscillation(Ackermann et al. 2015; Penil et al. 2020 Lister et al. 2013; Walker et al. 2018)
Zhou et al. 2018~34.5 days
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S8: black hole jet
• CCS vs. outmost
• maximum velocity
• GRB ? Lithwick & Sari 2001
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S8: black hole jet
• jet power (BZ)
• jet current (3C 303)
• potential difference
Kronberg et al. 2011
Zhang et al. 2018
UHE cosmic rays
Abraham et al. 2010
>1 EeV
highest ~1021 eV
Kotera & Olinto 2011
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S8: black hole jet
• jet power (BZ)
Narayan & McClintock 2012
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S9: CO/AD as boundary
• Stokes's theorem to
• Gauss's theorem to
• AD surface density
𝐸
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S9: CO/AD as boundary
𝐸
• CO total charge
• BH/AD charged vs. RL/RQ in AGN
Kerr – Newman metric• BH charge
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S10: stability
• marginally stable to the kink instability (Tomimatsu et al. 2001)
• spine-layer structure may be naturally stabilized(e.g., Mizuno et al. 2007; Hardee 2007)
• M87
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S11. conclusion & summary
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S11. conclusion & summary
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S11. conclusion & summary
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S11. conclusion & summary• Jet launching, acceleration and collimation
numerically vs. analytically
jet shape configuration, acceleration profile (from non-relativistic to relativistic), polarization pattern, limb-brightening (a hollow jet), periodical signals (a helical jet), stratified jet etc
• Match observational and numerical results; predict more phenomena
• An analytically quantitative 3D jet
Jet problem
(magnetic filed, velocity, density etc)
• seems to be complex MHD system• a simple electrodynamical problem
cartoon physical• Core equation solving(“pulsar” equation into two parts)
0
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Thanks!
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Pulsar Nebula – Crab
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Pulsar - misaligned
• self-balanced
• polar magnetic field
• equatorial magnetic field
• “jet-torus” feature
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Pulsar - aligned
McKinney 2006
wind velocityRees & Gunn 1974; Kennel & Coroniti 1984
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Pulsar – jet - electric potential difference
• Potential difference
• Compact Object (UHE cosmic rays)
Amenomori et al. 2019Hester 2008
• Crab Nebula
Abraham et al. 2010
>1 EeV
highest ~3 * 1020 eV
Kotera & Olinto 2011