Background subtracted pulsed fractions of the 0.42 s signal as a function of energy for the 2013 (black circles) and 2014 (red squares) pn data. Credit: Israel et al., 2016.
A team of European astronomers has discovered a new pulsar in a variable ultraluminous X-ray source (ULX) known as NGC 7793 P13. The newly found object is the third ultraluminous X-ray pulsar detected so far, and also the fastest-spinning one. ULXs are point sources in the sky that are so bright in X-rays that each emits more radiation than a million suns emit at all wavelengths. Although they are less luminous than active galactic nuclei, they are more consistently luminous than any known stellar process.
NGC 7793 P13 (also known as XMMU J235751...
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