Testing High-energy Emission Models for Blazars with X-Ray Polarimetry

Abstract Both leptonic and hadronic emission processes may contribute to blazar jet emission; which dominates in blazars’ high-energy component remains an open question. Some intermediate synchrotron peaked blazars transition from their low- components the X-ray band making them excellent laboratories probe both simultaneously, good targets for newly launched Imaging Polarimetry Explorer (IXPE). We characterize spectral energy distributions three such blazars, CGRaBS J0211+1051, TXS 0506+056, S5 0716+714, predicting polarization behavior by fitting a multizone polarized model. find that significant detection of electron dominated is possible with 300 ks observation 0716+714 J0211+1051 flaring states, while even 500 observations are unlikely measure self-Compton (SSC) polarization. Importantly, nonleptonic like proton marginally detectable our brightest (ISP), during state. Improved IXPE data reduction methods or next-generation telescopes eXTP needed confidently SSC