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

  • NASA’s IXPE mission, alongside additional observatories, studied a bright active galactic nucleus known as BL Lacertae in late November 2023, uncovering the process behind the X-rays produced by its powerful jets.
  • Scientists debated whether protons or electrons caused the X-rays, prompting IXPE to measure polarization and test these competing hypotheses.
  • IXPE found X-rays had less than 7.6% polarization while optical light showed 47.5%, indicating electrons scatter photons via the Compton effect to create X-rays.
  • Iván Agudo emphasized IXPE and ground telescopes provided tools to solve a major mystery about black hole jets caused by electron-photon interactions called Compton scattering.
  • These findings clarify black hole jet X-ray origins and suggest future searches for similar events can expand understanding of extreme astrophysical processes.
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doi.org broke the news in on Tuesday, May 6, 2025.
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