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This Black Hole Has Some Pol (arization)

28 Mar 2021, 00:28 UTC
This Black Hole Has Some Pol (arization)
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Title: First M87 Event Horizon Telescope Results. VIII. Magnetic Field Structure near The Event HorizonAuthors: The Event Horizon Telescope CollaborationStatus: Published in The Astrophysical Journal Letters, open accessIn 2019, the Event Horizon Telescope (EHT) Collaboration released the first ever image of a black hole. They used a network of telescopes across the globe and found that the black hole, located 55 million light years away in the M87 galaxy, has a mass that is 6.5 billion times that of the Sun. Their images and measurements took the world by storm, and now the collaboration has released new results based on the polarization near the black hole. The group released two papers this week: the first detailing the polarimetric observations (Paper VII) and the second discussing models of the magnetic field structure of the black hole (Paper VIII).
Scrambled Synchrotron RadiationThe M87 black hole emits radio light because of synchrotron radiation. The material surrounding the black hole is a plasma, and is therefore full of electrons and ions. Those charged particles move close to the speed of light. When they encounter a magnetic field, they spiral around it and release radio waves, which can then be detected by the EHT. ...

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