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As a rule, both lobes of Fanaroff-Riley (FR) type-II radio sources areterminated with hotspots, but the 3C328 radio galaxy is a specimen of an FRII-like object with a hotspot in only one lobe. A conceivable reason for suchasymmetry is that the nucleus of 3C328 was temporarily inactive. There was noenergy transfer from it to the lobes during the period of quiescence, and sothey began to fade out. However, under the assumption that the axis connectingthe two lobes makes an appreciable angle with the sky plane, and hence one isconsiderably farther from the observer than the other, the lobes are observedat two distinct stages of evolution due to the light-travel lag. While thefar-side lobe is still perceived as being of the FR II type with a hotspot,decay of the near-side lobe is already apparent. No jets are visible in the VLAimages, but the VLBA observations of the inverted-spectrum core component of3C328 have revealed that it has a jet of a sub-arcsecond length pointingtowards the lobe that shows evidence of decay. Since the jet always points tothe near side, its observed orientation is in line with the scenario proposedhere. The presence of the jet supports the inference that the nucleus of 3C328is currently active; however, given the fact that the jet is short (approx. 200pc in projection), the activity must have restarted very recently. The lowerand upper limits of the quiescent period length have been calculated.

Restarted activity in the 3C328 radio galaxy