Discovery of a 0.42-s pulsar in the ultraluminous X-ray source NGC 7793 P13

G. L. Israel, A. Papitto, P. Esposito +11

NGC 7793 P13 is a variable (luminosity range ~100) ultraluminous X-ray source (ULX) proposed to host a stellar-mass black hole of less than 15 M${}_{\odot }$ in a binary system with o…