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An accreting pulsar with extreme properties drives an ultraluminous x-ray source in NGC 5907

Wolter, Anna; Esposito, Paolo; Turolla, Roberto +20 more

Ultraluminous x-ray sources (ULXs) in nearby galaxies shine brighter than any x-ray source in our Galaxy. ULXs are usually modeled as stellar-mass black holes (BHs) accreting at very high rates or intermediate-mass BHs. We present observations showing that NGC 5907 ULX is instead an x-ray accreting neutron star (NS) with a spin period evolving fro…