Nature Astronomy, Published online: 21 June 2024; doi:10.1038/s41550-024-02294-9

The accretion geometry of X-ray binary Cygnus X-3 is determined here from IXPE observations. X-ray polarization reveals a narrow funnel with reflecting walls, which focuses emission, making Cyg X-3 appear as an ultraluminous X-ray source.

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