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We report the discovery of X-ray periodicity of ~265.3 ms from a deepXMM-Newton observation of the radio-quiet gamma-ray pulsar, PSR J2021+4026,located at the edge of the supernova remnant G78.2+2.1 (gamma-Cygni).Thedetected frequency is consistent with the gamma-ray pulsation determined by theobservation of Fermi Gamma-ray Space Telescope at the same epoch. The X-raypulse profile resembles the modulation of hot spot on the surface of theneutron star. The phase-averaged spectral analysis also suggests that themajority of the observed X-rays have a thermal origin. This is the third memberin the class of radio-quiet pulsars with the significant pulsations detectedfrom both X-rays and gamma-ray regimes.

Discovery of X-ray Pulsation from the Geminga-like Pulsar PSR J2021+4026