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We report observations of the remnant of Supernova 1987A with the HighResolution Camera (HRC) onboard the Chandra X-ray Observatory. A direct imagefrom the HRC resolves the annular structure of the X-ray remnant, confirmingthe morphology previously inferred by deconvolution of lower resolution datafrom the Advanced CCD Imaging Spectrometer. Detailed spatial modeling showsthat the a thin ring plus a thin shell gives statistically the best descriptionof the overall remnant structure, and suggests an outer radius 0.96" +/- 0.05"+/- 0.03" for the X-ray-emitting region, with the two uncertaintiescorresponding to the statistical and systematic errors, respectively. This isvery similar to the radius determined by a similar modeling technique for theradio shell at a comparable epoch, in contrast to previous claims that theremnant is 10-15% smaller at X-rays than in the radio band. The HRCobservations put a flux limit of 0.010 cts/s (99% confidence level, 0.08-10 keVrange) on any compact source at the remnant center. Assuming the sameforeground neutral hydrogen column density as towards the remnant, this allowsus to rule out an unobscured neutron star with surface temperature T^\infty >2.5MK observed at infinity, a bright pulsar wind nebula or a magnetar.

High Resolution X-ray Imaging of Supernova Remnant 1987A