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

Abstract

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

arXiv commentAccepted for publication in The Astrophysical Journal Letters

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• The Likely Fermi detection of the supernova remnant SN 1006
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• An Expanding Shell of Neutral Hydrogen Associated with SN 1006: Hints for the Single-Degenerate Origin and Faint Hadronic Gamma-Rays
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• Electron Acceleration in Middle-age Shell-type $\gamma$-Ray Supernova Remnants
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• Parametric studies of cosmic ray acceleration in supernova remnants
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• Kinematics of Supernova Remnants: Status of X-Ray Observations
• The Galactic Sky seen by H.E.S.S
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