Now showing items 1-9 of 9

    • Leptonic and hadronic modeling of Fermi-detected blazars 

      Böttcher, M.; Reimer, A.; Sweeney, K.; Prakash, A. (IOP Science, 2013)
      We describe new implementations of leptonic and hadronic models for the broadband emission from relativistic jets in active galactic nuclei in a temporary steady state. For the leptonic model, a temporary equilibrium between ...
    • Multi-band implications of external-IC flares 

      Richter, Stephan; Spanier, Felix (Elsevier, 2015)
      Very fast variability on scales of minutes is regularly observed in Blazars. The assumption that these flares are emerging from the dominant emission zone of the very high energy (VHE) radiation within the jet challenges ...
    • The polarization dependence of γγ absorption - implications for γ-ray bursts and blazars 

      Böttcher, M. (IOP Publishing, 2014)
      This paper presents an analysis of the dependence of the opacity for high-energy γ-rays to γγ absorption by low-energy photons on the polarization of the γ-ray and target photons. This process has so far only been considered ...
    • Polarization swings reveal magnetic energy dissipation in blazars 

      Zhang, Haocheng; Böttcher, Markus; Chen, Xuhui; Guo, Fan; Li, Hui (American Astronomical Society, 2015)
      The polarization signatures of blazar emissions are known to be highly variable. In addition to small fluctuations of the polarization angle around a mean value, large (gsim180°) polarization angle swings are sometimes ...
    • Relativistic positron-electron-ion shear flows and application to gamma-ray bursts 

      Liang, Edison; Fu, Wen; Boettcher, Markus; Smith, Ian; Roustazadeh, Parisa (IOP Science, 2013)
      We present particle-in-cell simulation results of relativistic shear flows for hybrid positron–electron–ion plasmas and compare to those for pure e+e− and pure e− ion plasmas. Among the three types of relativistic shear ...
    • Seed photon fields of blazars in the internal shock scenario 

      Joshi, M.; Böttcher, M.; Marscher, A.P. (IOP Publishing, 2014)
      We extend our approach of modeling spectral energy distribution (SED) and light curves of blazars to include external Compton (EC) emission due to inverse Compton scattering of an external anisotropic target radiation ...
    • Synchrotron polarization in blazars 

      Zhang, Haocheng; Böttcher, Markus; Chen, Xuhui (IOP Publishing, 2014)
      We present a detailed analysis of time- and energy-dependent synchrotron polarization signatures in a shock-in-jet model for γ-ray blazars. Our calculations employ a full three-dimensional radiation transfer code, assuming ...
    • Time dependent hadronic modeling of flat spectrum radio quasars 

      Diltz, C.; Böttcher, M.; Fossati, G. (American Astronomical Society, 2015)
      We introduce a new time-dependent lepto-hadronic model for blazar emission that takes into account the radiation emitted by secondary particles, such as pions and muons, from photo hadronic interactions. Starting from ...
    • X-ray and gamma-ray polarization in leptonic and hadronic jet models of blazars 

      Zhang, H.; Böttcher, M. (IOP Science, 2013)
      We present a theoretical analysis of the expected X-ray and γ-ray polarization signatures resulting from synchrotron self-Compton emission in leptonic models compared to the polarization signatures from proton synchrotron ...