Zyuzin D.A.; Karpova A.V.; Shibanov Y.A.; Potekhin A.Y.; Suleimanov V.F.
(2021)
We analyse new XMM-Newton and archival Chandra observations of the middle-aged γ-ray radio-quiet pulsar J1957+5033. We detect, for the first time, X-ray pulsations with the pulsar spin period of the point-like source ...