Chandra Observations of the Anomalous X-Ray Pulsar 1E 2259+586

We present X-ray imaging, timing, and phase-resolved spectroscopy of the anomalous X-ray pulsar 1E 2259+586 using the Chandra X-Ray Observatory. The spectrum is well described by a power-law plus blackbody model with Γ = 3.6(1), kTBB = 0.412(6) keV, and NH = 0.93(3) × 1022 cm-2; we find no evidence for spectral features (0.5-7.0 keV). We derive a new, precise X-ray position for the source and determine its spin period, P = 6.978977(24) s. Time-resolved X-ray spectra show no significant variation as a function of pulse phase. We have detected excess emission beyond 4'' from the central source extending to beyond 100'', due to the supernova remnant and possibly dust scattering from the interstellar medium.