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NASA's IXPE reveals X-ray-generating particles in black hole jets

  • NASA's IXPE revealed that X-rays in the jets of blazar BL Lacertae originate from electrons scattering photons via the Compton effect in late November 2023 observations.
  • This discovery addressed a longstanding debate over whether protons or electron-photon interactions cause X-ray emission in supermassive black hole jets.
  • IXPE measured X-ray polarization below 7.6%, far less than the 47.5% optical polarization, confirming electron involvement through Compton scattering with support from ground-based telescopes.
  • Lead author Iván Agudo explained that IXPE, alongside several complementary ground-based observatories, equipped researchers with the necessary means to resolve a significant mystery surrounding black hole jets.
  • The findings, available as a preprint and to appear in Astrophysical Journal Letters, highlight IXPE's unique polarized X-ray capability and open avenues for discovering similar sources.
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doi.org broke the news in on Tuesday, May 6, 2025.
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