Origin of the ring structures in Hercules A - Sub-arcsecond 144 MHz to 7 GHz observations

Sub-arcsecond imaging with the International LOFAR Telescope

Open Access

Fig. 4

VLA image of the western lobe of Hercules A in C band (7 GHz). The solid black regions indicate the regions used to measure the flux density of the rings. The regions with the dashed black borders indicate the regions used to estimate thebackground surface brightness of the lobe material at the position of the rings.

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