Discovery of X-ray pulsations from "next Geminga" - PSR J1836+5925
  We report the X-ray pulsation of ~173.3 ms for the "next Geminga", PSR J1836+5925, with recent XMM-Newton investigations. The X-ray periodicity is consistent wtih the gamma-ray ephemeris at the same epoch. The X-ray folded light curve has a sinusoidal structure which is different from the double-peaked gamma-ray pulse profile. We have also analysed the X-ray phase-averaged spectra which shows the X-ray emission from PSR J1836+5925 is thermal dominant. This suggests the X-ray pulsation mainly originates from the modulated hot spot on the stellar surface. 
L. C. C. Lin (1), C. Y. Hui (2), K. T. Li (3), J. Takata (4), C. P. Hu   (5), A. K. H. Kong (1), D. C. C. Yen (6) and Y. Cho...
astro-ph.HE