Evidence for vacuum birefringence from the first optical-polarimetry measurement of the isolated neutron star RX J1856.5−3754

@article{Mignani2017EvidenceFV,
  title={Evidence for vacuum birefringence from the first optical-polarimetry measurement of the isolated neutron star RX J1856.5−3754},
  author={R. Mignani and V. Testa and D. G. Caniulef and R. Taverna and R. Turolla and S. Zane and K. Wu},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2017},
  volume={465},
  pages={492-500}
}
The ‘Magnificent Seven’ (M7) are a group of radio-quiet isolated neutron stars discovered in the soft X-rays through their purely thermal surface emission. Owing to the large inferred magnetic fields (B ≈ 1013 G), radiation from these sources is expected to be substantially polarized, independently of the mechanism actually responsible for the thermal emission. A large observed polarization degree (PD) is, however, expected only if quantum-electrodynamic (QED) polarization effects are present… Expand
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