Kavli Affiliate: Roger W. Romani
| First 5 Authors: Ioannis Liodakis, Haocheng Zhang, Stella Boula, Riccardo Middei, Jorge Otero-Santos
| Summary:
The origin of the high-energy emission in astrophysical jets from black holes
is a highly debated issue. This is particularly true for jets from supermassive
black holes that are among the most powerful particle accelerators in the
Universe. So far, the addition of new observations and new messengers have only
managed to create more questions than answers. However, the newly available
X-ray polarization observations promise to finally distinguish between emission
models. We use extensive multiwavelength and polarization campaigns as well as
state-of-the-art polarized spectral energy distribution models to attack this
problem by focusing on two X-ray polarization observations of blazar BL
Lacertae in flaring and quiescent $gamma$-ray states. We find that regardless
of the jet composition and underlying emission model, inverse-Compton
scattering from relativistic electrons dominates at X-ray energies.
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