SN 1006 and cosmic-ray acceleration

SN 1006 was shown by ASCA to be of a dual nature, with nonthermal emissioncoming from the bright limbs superposed on fainter thermal emission. This is thebest example we have of shock acceleration of cosmicray electrons to energiesapproaching the knee.. in the cosmicray spectrum (supernova remnants arethought to be the main sites of cosmicray acceleration). We have analysed theXMMNewton pointings on SN 1006, and have measured for the first time the radialand azimuthal variations of the synchrotron emission. We propose to finishmapping the whole remnant with deeper exposures, allowing to measure thenonthermal emission outside the bright limbs (the current constraint is morelike an upper limit). truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]