FIGURE 2.10 Supernova remnant RX J1713.7-3946 observed in the highest-energy tera-electron-volt (TeV) gamma rays. Recent observations using atmospheric Čerenkov telescopes have demonstrated that cosmic rays are accelerated to energies in excess of 100 TeV and that the magnetic field is amplified to high strength. Contours are X-ray emission. Supernova explosions like those that left behind this source created and dispersed heavy elements and also accelerated cosmic rays. SOURCE: The HESS Collaboration: F. Aharonian, A.G. Akhperjanian, A.R. Bazer-Bachi, M. Beilicke, W. Benbow, D. Berge, K. Bernlöhr, C. Boisson, O. Bolz, V. Borrel, I. Braun, F. Breitling, et al., A detailed spectral and morphological study of the gamma-ray supernova remnant RX J1713.7-3946 with H.E.S.S. Astronomy and Astrophysics 449(1):223-242, 2006, © ESO, reproduced with permission.