Discovery of X-Ray Pulsations from the Next Geminga, PSR J1836+5925
Takata, J.; Kong, A. K. H.; Hui, C. Y.; Lin, L. C. C.; Hu, C. P.; Chou, Y.; Li, K. T.; Yen, D. C. C.
Taiwan, South Korea, Hong Kong SAR
Abstract
We report recent XMM-Newton investigations of PSR J1836+5925, the "next Geminga," which determined an X-ray pulsation of ~173.3 ms. Its X-ray periodicity is consistent with the γ-ray ephemeris at the same epoch. The X-ray folded light curve has a sinusoidal structure that is different from the double-peaked γ-ray pulse profile. We have also analyzed the X-ray phase-averaged spectra which shows that the X-ray emission from PSR J1836+5925 is thermal dominant. This suggests that the X-ray pulsation mainly originates from the modulated hot spot on the stellar surface.