%0 Journal Article
%T Discovery of ¦Ã-ray pulsation and X-ray emission from the black widow pulsar PSR J2051-0827
%A J. H. K. Wu
%A A. K. H. Kong
%A R. H. H. Huang
%A J. Takata
%A P. H. T. Tam
%A E. M. H. Wu
%A K. S. Cheng
%J Physics
%D 2012
%I arXiv
%R 10.1088/0004-637X/748/2/141
%X We report the discovery of pulsed {\gamma}-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 (ACIS-S) on the Chandra X-ray Observatory. Using 3 years of LAT data, PSR J2051-0827 is clearly detected in {\gamma}-ray with a signicance of \sim 8{\sigma} in the 0.2 - 20 GeV band. The 200 MeV - 20 GeV {\gamma}-ray spectrum of PSR J2051-0827 can be modeled by a simple power- law with a photon index of 2.46 \pm 0.15. Significant (\sim 5{\sigma}) {\gamma}-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 {\gamma}-rays and X-rays with theoretical models, we suggest that the {\gamma}-ray emission is from the outer gap while the X-rays can be from intra-binary shock and pulsar magnetospheric synchrotron emissions.
%U http://arxiv.org/abs/1201.5980v1