Recent polarization measurements of the stellar-mass black hole in Cygnus X-1 reveal an extended corona in the inner parts of the accretion flow and open the path for a new era in high-energy astrophysics.
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Malzac, J. A new window on black hole accretion. Nat Astron 2, 623–624 (2018). https://doi.org/10.1038/s41550-018-0507-z
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DOI: https://doi.org/10.1038/s41550-018-0507-z
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