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We report on the first X-ray proper-motion measurements of thenonthermally-dominated forward shock in the northeastern limb of SN 1006, basedon two Chandra observations taken in 2000 and 2008. We find that the propermotion of the forward shock is about 0.48 arcsec/yr and does not vary aroundthe rim within the ~10% measurement uncertainties. The proper motion measuredis consistent with that determined by the previous radio observations. The meanexpansion index of the forward shock is calculated to be ~0.54 which matchesthe value expected based on an evolutionary model of a Type Ia supernova witheither a power-law or an exponential ejecta density profile. Assuming pressureequilibrium around the periphery from the thermally-dominated northwestern rimto the nonthermally-dominated northeastern rim, we estimate the ambient densityto the northeast of SN 1006 to be about 0.085/cm^3.

The First X-Ray Proper-Motion Measurements of the Forward Shock in the Northeastern Limb of SN 1006