Discovery of pulsations from NGC 300 ULX1 and its fast period evolution
Discovery of pulsations from NGC 300 ULX1 and its fast period evolution
The supernova impostor SN 2010da located in the nearby galaxy NGC 300, later identified as a likely supergiant B[e] high-mass X-ray binary, was simultaneously observed by NuSTAR and XMM-Newton between 2016 December 16 and 20, over a total time span of 310 ks. We report the discovery of a strong …