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Cygnus X-3 revealed as a Galactic ultraluminous X-ray source by IXPE

Ingram, Adam; Kaaret, Philip; Wu, Kinwah +127 more

The accretion of matter by compact objects can be inhibited by radiation pressure if the luminosity exceeds a critical value known as the Eddington limit. The discovery of ultraluminous X-ray sources has shown that accretion can proceed even when the apparent luminosity considerably exceeds this limit. A high apparent luminosity might be produced …