Flux of photons produced by synchrotron emission for a filament observed from the directions forming the indicated angles with its axis. The filament is located at 100 Mpc and harbors a source that injects a pure proton composition with (isotropic) luminosity of LE,19 = 1042 erg/s and a spectral index of 2.3. The four panels represent various models of magnetic fields. From left to right: “anisotropic” with B0 = 0.1 nG, “anisotropic” with B0 = 1 nG, “isotropic” with B0 = 1 nG, and “contrasted” with B0 = 1 nG.
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