Semi-analytical Radiative Transfer Modeling of the Centaurus A Jet: Spectral Energy Distribution, Coreshift, and Limb-brightening

Résumé fourni par la source

Abstract We investigate stationary and axisymmetric models of the Centaurus A jet employing our post-processing radiative transfer code, R-JET . By combining existing magnetohydrodynamic simulations with broadband observational data, we constrain the evolution of the magnetic field, particle density, and magnetization parameter along the jet. We subsequently calculate the broadband spectra, frequency-dependent core separation, and surface brightness distributions for various combinations of pair fraction, efficiency of conversion from electromagnetic energy into kinetic energy, horizon magnetic field strength, and upper cutoff random Lorentz factor for nonthermal pairs. Comparison of these results with observations reveals that the limb-brightened structure is a natural consequence of latitude-dependent energy extraction from a rotating BH. In this scenario, the rotational energy of the black hole is predominantly released along the magnetic field lines threading the event horizon in the middle and lower latitudes. Furthermore, we find that the jet transitions to a kinetically dominated state within 1000 Schwarzschild radii. It is implied that the Centaurus A jet is normal-plasma dominated because significant mass entrainment is required so that the Poynting flux may be converted into kinetic flux at such small radii.

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