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We report on the peculiar activity of the radio source located at the centerof the cooling flow cluster RBS797 (z=0.35), the first distant cluster in whichtwo pronounced X-ray cavities have been discovered. New multifrequency (1.4,4.8, and 8.4 GHz) observations obtained with the Very Large Array clearlyreveal the presence of radio emission on three different scales showingorientation in different directions, all of which indicates that RBS797represents a very peculiar case. The lowest resolution images show large-scaleradio emission characterized by amorphous morphology and a steep spectrum,extended on a scale of hundreds of kpc. On a scale of tens of kpc, there isevidence of 1.4 GHz radio emission elongated in the northeast-southwestdirection exactly towards the holes detected in X-rays. The highest resolutionimage shows the details of the innermost 4.8 GHz radio jets on a kpc scale;they are remarkably oriented in a direction that is perpendicular to that ofthe extended structure detected at a lower resolution. We therefore findevidence of a strong interaction between the central radio source and theintra-cluster medium in RBS797. We suggest a scenario in which the 1.4 GHzemission filling the X-ray cavities consists of buoyant bubbles of radioemitting plasma that are created by twin jets in the past and whose expansionhas displaced the thermal gas that was formerly in the X-ray holes, whereas thetwo jets visible at 4.8 GHz are related to the present nuclear activity thathas restarted at a different position angle from the original outburst thatcreated the outer radio lobes. The total radio luminosity is ~ 10^42 erg/s,corresponding to a factor of a few thousand times less than the estimatedcooling luminosity.Comment: 9 pages, 4 figures, accepted for publication in Astronomy &  Astrophysics; replaced with revised version corrected for language editin

Multifrequency VLA radio observations of the X-ray cavity cluster of galaxies RBS797: evidence of differently oriented jets