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Comptonized X-rays from Relativistic Jets in Active Galactic Nuclei
Milton Arencibia (P&A, UCL; U. de La Laguna)Supervisor: Prof. Kinwah Wu (MSSL, UCL)
Contents
• Basic AGN jet physics & astrophysics
• Structured jets and spectral formation
• MC simulation & numerical model
• Results
Jets in Active Galactic Nuclei (AGN)
Basic AGN Jet Physics & Astrophysics
Imaging observations of structured jets
Credit: NASA; NRAO, STScIBasic AGN Jet Physics & Astrophysics
Spectral observation of structured jets
M87 Jet
Basic AGN Jet Physics & Astrophysics
Credit: Böhringer et al. (2001) &Berghöfer et al.
Spectral observation of structured jets
More M87
Basic AGN Jet Physics & Astrophysics
Credit: J.A. Biretta, C.P. Stern, D.E. Harris
Diversity & complexity of structured AGN jets
• Knots – shocks
• Quenched jets– Entrenching in IGM
• Bent jets• Bubble blowing jets
Structured Jets & Spectral Formation
Credit: J.A. Biretta, F.N. Owen
Diversity & complexity of structured AGN jets
• Knots– shocks
• Quenched jets– Entrenching in IGM
• Bent jets• Bubble blowing jets
Structured Jets & Spectral Formation
Credit: C. Saxton, K. Wu
Diversity & complexity of structured AGN jets
• Knots– shocks
• Quenched jets– Entrenching in IGM
• Bent jets• Bubble blowing jets
Structured Jets & Spectral Formation
Diversity & complexity of structured AGN jets
• Knots– shocks
• Quenched jets– Entrenching in IGM
• Bent jets• Bubble blowing jets
Structured Jets & Spectral Formation
Radiative processes in relativistic jet plasmas
• Synchrotron radiation
• Compton scattering
Basic AGN Jet Physics & Astrophysics
Credit: P.A. Hughes
Radiative processes in relativistic jet plasmas
• Synchrotron radiation
• Compton scattering
Basic AGN Jet Physics & Astrophysics
Credit: L. Van Speybroeck
Frequency shift in Compton scattering
Relativistic Compton scattering in OF:
Competition between relativisticboosting and scattering recoil
Basic AGN Jet Physics & Astrophysics
Spectral formation with Compton scattering
• Kompaneets equation
Doppler boostingSources (injection)
SinksInduced scattering
Compton recoil
Basic AGN Jet Physics & Astrophysics
Monte Carlo simulation
Monte Carlo Simulation & Numerical Model
q(x)
Compton scattering
Yes
No
Bin to spectrum
still in jet?
No
Yes
Simulation scheme
Monte Carlo Simulation & Numerical ModelMonte Carlo Simulation & Numerical Model
Jet opening angle ~1/Γ
Fixed viewing angle i=7.5ºOptical depth ~ 3E-3Injection spectra:
•Jet synchrotron•Thermal disk•CMB
Simulation scheme
Monte Carlo Simulation & Numerical ModelMonte Carlo Simulation & Numerical Model
Jet opening angle ~1/Γ
Fixed viewing angle i=7.5ºOptical depth ~ 3E-3Injection spectra:
•Jet synchrotron•Thermal disk•CMB
Simulation scheme
Monte Carlo Simulation & Numerical ModelMonte Carlo Simulation & Numerical Model
Jet opening angle ~1/Γ
Fixed viewing angle i=7.5ºOptical depth ~ 3E-3Injection spectra:
•Jet synchrotron•Thermal disk•CMB
Power law density, low speed jet (Γ=5)
Results
CMB Disc Synchrotron
α~1.64 α~1.3 α~ 1.63
Power law density, medium speed jet (Γ=40)
Results
CMB Disc Synchrotron
α~1.64 α~ 1.65
Periodic density, low speed jet (Γ=5)
Results
CMB Disc Synchrotron
α~1.63 α~1.68
Periodic density, medium speed jet (Γ=40)
Results
CMB Disc Synchrotron
α~1.63 α~1.68
Exponential density, low speed (Γ=5)
Results
CMB Disc Synchrotron
α~1.63 α~1.71
Exponential density, medium speed (Γ=40)
Results
CMB Disc Synchrotron
α~1.65 α~1.68
Interpretation?
Results
Greater boosting along smaller escape angles
No steepening/flattening of spectra for differently structured jets
Further study?
A more realistic jet model would include radial dependence (jet spine with τ~1) and NLR+BLR injection
Questions?
• P.A. Hughes, “Beams and jets in astrophysics”, 1991, Cambridge Astrophysics Series 49, Cambridge University Press