The discovery of weak coherent pulsations in the ultraluminous X-ray source NGC 1313 X-2
The discovery of weak coherent pulsations in the ultraluminous X-ray source NGC 1313 X-2
We report the detection of weak pulsations from the archetypal ultraluminous X-ray source (ULX) NGC 1313 X-2. Acceleration searches reveal sinusoidal pulsations in segments of two out of six new deep observations of this object, with a period of $\sim$ 1.5 s and a pulsed fraction of $\sim$ 5%. We …