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We present deep Giant Metrewave Radio Telescope (GMRT) radio observations at240, 330 and 610 MHz of the complex radio source at the center of the NGC1407galaxy group. Previous GMRT observations at 240 MHz revealed faint, diffuseemission enclosing the central twin-jet radio galaxy. This has been interpretedas an indication of two possible radio outbursts occurring at different times.Both the inner double and diffuse component are detected in the new GMRT imagesat high levels of significance. Combining the GMRT observations with archivalVery Large Array data at 1.4 and 4.9 GHz, we derive the total spectrum of bothcomponents. The inner double has a spectral index \alpha=0.7, typical foractive, extended radio galaxies, whereas the spectrum of the large-scaleemission is very steep, with \alpha=1.8 between 240 MHz and 1.4 GHz. Theradiative age of the large-scale component is very long, ~300 Myr, compared to~30 Myr estimated for the central double, confirming that the diffuse componentwas generated during a former cycle of activity of the central galaxy. Thecurrent activity have so far released an energy which is nearly one order ofmagnitude lower than that associated with the former outburst. The group X-rayemission in the Chandra and XMM-Newton images and extended radio emission showa similar swept-back morphology. We speculate that the two structures are bothaffected by the motion of the group core, perhaps due to the core sloshing inresponse to a recent encounter with the nearby elliptical galaxy NGC1400.

Recurrent radio outbursts at the center of the NGC1407 galaxy group