Super-Eddington Accretion onto the Galactic Ultraluminous X-Ray Pulsar Swift J0243.6+6124
Super-Eddington Accretion onto the Galactic Ultraluminous X-Ray Pulsar Swift J0243.6+6124
Abstract We report on the spectral behavior of the first Galactic ultraluminous X-ray pulsar Swift J0243.6+6124 with NuSTAR observations during its 2017–2018 outburst. At sub-Eddington levels, the source spectrum is characterized by three emission components: from the accretion column, the hot spot, and a broad iron line emission region. When …