Spectral and Polarization Signatures of Relativistic Shocks in Blazars
AbstractRelativistic shocks are one of the most plausible sites of the emission of strongly variable, polarized multi-wavelength emission from relativistic jet sources such as blazars, via the diffusive shock acceleration (DSA) of relativistic particles. This paper summarizes recent results on a self-consistent coupling of diffusive shock acceleration and radiation transfer in blazar jets. We demonstrate that the observed spectral energy distributions (SEDs) of blazars strongly constrain the nature of hydromagnetic turbulence responsible for pitch-angle scattering by requiring a strongly energy-dependent pitch-angle mean free path. The prominent soft X-ray excess (“Big Blue Bump”) in the SED of the BL Lac object AO 0235+164 can be modelled as the signature of bulk Compton scattering of external radiation fields by the thermal electron population, which places additional constraints on the level of hydromagnetic turbulence. It has further been demonstrated that internal shocks propagating in a jet pervaded by a helical magnetic field naturally produce polarization-angle swings by 180
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Böttcher, M. Spectral and Polarization Signatures of Relativistic Shocks in Blazars. Galaxies 2016, 4, 22.
Böttcher M. Spectral and Polarization Signatures of Relativistic Shocks in Blazars. Galaxies. 2016; 4(3):22.Chicago/Turabian Style
Böttcher, Markus. 2016. "Spectral and Polarization Signatures of Relativistic Shocks in Blazars." Galaxies 4, no. 3: 22.
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