2012ApJ...748..141W

We report the discovery of pulsed γ-ray emission and X-ray emission from the black widow millisecond pulsar PSR J2051-0827 by using the data from the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope and the Advanced CCD Imaging Spectrometer array on the Chandra X-Ray Observatory. Using three years of LAT data, PSR J2051-0827 is clearly detected in γ-rays with a significance of ∼8σ in the 0.2-20 GeV band. The 200 MeV-20 GeV γ-ray spectrum of PSR J2051-0827 can be modeled by a simple power law with a photon index of 2.46±0.15. Significant (∼5σ) γ-ray pulsations at the radio period were detected. PSR J2051-0827 was also detected in soft (0.3-7 keV) X-ray with Chandra. By comparing the observed γ-rays and X-rays with theoretical models, we suggest that the γ-ray emission is from the outer gap while the X-rays can be from intra-binary shock and pulsar magnetospheric synchrotron emissions.