Image of a filament in gamma-rays produced via synchrotron emission, integrated over Eγ = 1−100 GeV. We chose an “anisotropic” distribution of the magnetic field with normalization B0 = 1 nG. Left: the filament is observed along its axis from a distance of 100 Mpc and the embedded source has a cosmic-ray luminosity of LE,19 = 1044 erg s-1. Right: the filament is observed along its axis from a distance of 1 Gpc and the embedded source has a luminosity of LE,19 = 1046 erg s-1. The color bar indicates the logarithm of the flux in GeV cm-2 s-1. White contours indicate a flux level of 10-10 GeV cm-2 s-1.
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