Discovery of 47-s pulsations in the X-ray source 1RXS J225352.8+624354

  title={Discovery of 47-s pulsations in the X-ray source 1RXS J225352.8+624354},
  author={Paolo Esposito and Gian Luca Israel and Lara Sidoli and E. I. Mason and G. A. Rodr{\'i}guez Castillo and Jules P. Halpern and Alberto Moretti and Diego Gotz},
  journal={Monthly Notices of the Royal Astronomical Society},
We report on the discovery of pulsations at a period of »47 s in the persistent X-ray source 1RXS J225352.8+624354 (1RXS J2253) using five Chandra observations performed in 2009. The signal was also detected in Swift and ROSAT data, allowing us to infer over a 16-yr baseline an average, long-term period increasing rate of …17 ms per year and therefore to confirm the signal as the spin period of an accreting, spinning-down neutron star. The pulse profile of 1RXS J2253 (»50‐60% pulsed fraction… 
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