Browsing Faculty of Natural and Agricultural Sciences by Author "9781d6bb-ddd3-4542-ae57-62a558dbc056"
Now showing items 1-7 of 7
-
Leptonic and hadronic modeling of Fermi-LAT hard spectrum quasars and predictions for high-energy polarization
Paliya, Vaidehi S.; Böttcher, Markus; Zhang, Haocheng; Ajello, M.; Domínguez, A. (IOP Publishing, 2018)We present the results of a study of the time-averaged spectral energy distributions (SEDs) of eight flat spectrum radio quasars (FSRQs) present in the second catalog of high energy sources detected beyond 50 GeV by the ... -
Multi-wavelength study of flaring activity in BL Lac object S5 0716+714 during the 2015 outburst
Chandra, Sunil; Böttcher, M.; Zhang, Haocheng; Kushwaha, Pankaj; Singh, K.P. (American Astronomical Society, 2015)We present a detailed investigation of the flaring activity observed from a BL Lac object, S5 0716+714 , during its brightest ever optical state in the second half of 2015 January. Observed almost simultaneously in the ... -
Multiwavelength polarization as a diagnostic of blazar physics
Böttcher, Markus; Zhang, Haocheng; Chen, Xuhui (Sissa Medialab, 2015)The nature of the high-energy emission in jet-dominated AGN (especially blazars) as well as the location and mode of acceleration of particles to ultra- relativistic energies are a matter of intensive debate. Both leptonic ... -
Polarization signatures of relativistic magnetohydrodynamic shocks in the blazar emission region. I. Force-free helical magnetic fields
Zhang, Haocheng; Böttcher, Markus; Deng, Wei; Li, Hui (IOP, 2016)The optical radiation and polarization signatures in blazars are known to be highly variable during flaring activities. It is frequently argued that shocks are the main driver of the flaring events. However, the spectral ... -
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 ... -
Probing the emission mechanism and magnetic field of neutrino blazars with multiwavelength polarization signatures
Zhang, Haocheng; Böttcher, Markus; Fang, Ke; Li, Hui; Giannios, Dimitrios (IOP Publishing, 2019)The characteristic two-component blazar spectral energy distribution (SED) can be of either leptonic and/or hadronic origins. The potential association of the high-energy neutrino event IceCube-170922A with the flaring ... -
Radiation and polarization signatures of the 3D multizone time-dependent hadronic blazar model
Zhang, Haocheng; Böttcher, Markus; Diltz, Chris (IOP Publishing, 2016)We present a newly developed time-dependent three-dimensional multizone hadronic blazar emission model. By coupling a Fokker–Planck-based lepto-hadronic particle evolution code, 3DHad, with a polarization-dependent radiation ...