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We report on the first proper motion measurement in the supernova remnant RXJ1713.7-3946 using the XMM-Newton X-ray telescope on a 13 year time interval.This expansion measurement is carried out in the south-east region of theremnant where two sharp filament structures are observed. For the outermostfilament, the proper motion is $0.73\pm0.047_{\rm stat} \pm 0.069_{\rm syst}$arcsec yr$^{-1}$ which is equivalent to a shock speed of 3500 km s$^{-1}$ at adistance of 1 kpc. In contrast with the bright north-west region where theshock is interacting with the border of the cavity, the shock in the south-eastregion is probably expanding in the original ambient medium carved by theprogenitor and can be used to derive the current density at the shock and theage of the remnant. In the case where the shock is evolving in a wind profile($\rho \propto r^{-s}$, s=2) or in a uniform medium (s=0), we estimate an ageof 2300 yrs and 1800 yrs respectively for an ejecta power-law index n=9. Thespecific case of n=7 and s=0, yields an age of 1550 yrs which would reconcileRX J1713.7-3946 with the historical records of SN 393. In all scenarios, wederive similar upstream densities of the order of 0.01 cm$^{-3}$, compatiblewith the lack of thermal X-rays from the shocked ambient medium.

Measurement of the X-ray proper motion in the south-east rim of RX J1713.7-3946