Fine Structure of the Thermal and Non - Thermal X - Rays in SN 1006

The north east shell of SN 1006 is the most probable acceleration site of high energy electrons (up to ∼ 100 TeV) with the Fermi acceleration mechanism at the shock front. We resolved non-thermal filaments from thermal emission in the shell with the excellent spatial resolution of Chandra. The non-thermal filaments seem thin sheets with the scales of ∼ 1 arcsec (0.01 pc) and ∼ 20 arcsec (0.2 pc) at upstream and downstream, respectively. In a simple diffusive shock acceleration (DSA) model with the magnetic field parallel to the shock normal, the downstream region should have highly disordered magnetic field of 30–40 μG. The width at the upstream side is extremely small, comparable to the gyroradius of the maximum energy electrons. This result is hard to be explained by a conventional DSA with the magnetic field parallel to the shock normal, hence require unusual conditions like perpendicular field at upstream and/or a new acceleration mechanism of electrons.