X-Ray Imaging Observations of the High-mass ?-Ray Binary HESS J0632+057

Abstract The Chandra X-Ray Observatory (CXO) imaged the high-mass ? -ray binary HESS J0632+057 with Advanced CCD Imaging Spectrometer (ACIS). We analyzed CXO data together 967 ks of archival Swift-XRT observations. On arcsecond scales we find a hint asymmetric extended emission. arcminute scales, region emission (“the blob”), located ? 5 .? east binary, is seen in both CXO-ACIS and images. blob does not have counterpart radio, near-IR, IR, or optical ACIS spectrum fits either an absorbed power-law model ? ? 2.6, thermal plasma kT 3 keV. Since blob’s N H significantly higher than that conclude are directly related. somewhat larger, very deep XRT image suggests may be within shell (or cavity). four spectra taken ?20 day interval near light-curve minimum suggest varies on timescales days, possibly due to inhomogeneous circumbinary environment. extracted from wider orbital phase intervals support significant changes maximum/minimum, which responsible for substantial systematic residuals 1 keV, provide tentative evidence Fe line at 6.4 no periodic signal up 0.156 Hz.