We report the detection of X-ray pulsations in the recently discovered gamma-ray/radio pulsar PSR J2214+3000. This pulsar was originally found by searching at radio wavelengths for pulsations in the unidentified Fermi/LAT gamma-ray source 0FGL J2214.8+3002 from the Fermi/LAT bright source list. Short, exploratory X-ray observations obtained by Swift/XRT and Chandra while this source was still unidentified revealed a moderately bright X-ray source with a thermal spectrum at the position of the radio/gamma-ray pulsar.
We present here results from a follow-up 80 ks Fast Timing Mode observation of this X-ray source with the EPIC-pn instrument on the XMM-Newton satellite conducted in May 2010. After removing sections of data with high background contamination, analysis of the remaining ~65 ks utilizing the now known pulsar radio ephemeris reveals X-ray pulsations at the significance level ~7.6 sigma. The shape of the X-ray pulse profile consists of two broad peaks with each peak being roughly equal strength and separated by about 0.4-0.5 in spin phase. We also find that the X-ray spectrum is well represented by a thermal hydrogen neutron star atmosphere model. This pulsar is one of the "black widow" pulsars in which the neutron star companion has a very low mass and has apparently been severely ablated by the radiation from the pulsating neutron star.