lobe of overedge source
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by WizardHowl
This looks like a plume of an overedge source, could be quite large if the galaxy from which the emission originates is not in this field of view. The brightest IR source to its 1 o'clock and the overedge bright IR source at top-right are both positioned such that they might be the origin but hopefully either FIRST or NVSS will provide a clearer picture.
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