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We report here X-ray imaging spectroscopy observations of the northeasternshell of the supernova remnant RCW 86 with Chandra and XMM-Newton. Along thispart of the shell the dominant X-ray radiation mechanism changes from thermalto synchrotron emission. We argue that both the presence of X-ray synchrotronradiation and the width of the synchrotron emitting region suggest a locallyhigher shock velocity of V_s = 2700 km/s and a magnetic field of B = 24+/-5microGauss. Moreover, we also show that a simple power law cosmic ray electronspectrum with an exponential cut-off cannot explain the broad band synchrotronemission. Instead a concave electron spectrum is needed, as predicted bynon-linear shock acceleration models. Finally, we show that the derived shockvelocity strengthens the case that RCW 86 is the remnant of SN 185.Comment: 5 pages, 4 figures. The last figure is intended as a color plate.  Accepted by ApJ Letter

The X-Ray Synchrotron Emission of RCW 86 and the Implications for Its Age