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We present the first results of a deep $Chandra$ observation of the galaxycluster RBS 797, whose previous X-ray studies revealed two pronounced X-raycavities in the east-west (E-W) direction. Follow-up VLA radio observations ofthe central active galactic nucleus (AGN) uncovered different jet and lobeorientations, with radio lobes filling the E-W cavities and perpendicular jetsshowing emission in the north-south (N-S) direction over the same scale($\approx$30 kpc). With the new $\sim$427 ks total exposure, we report thedetection of two additional, symmetric X-ray cavities in the N-S direction atnearly the same radial distance as the E-W ones. The newly discovered N-Scavities are associated with the radio emission detected at 1.4 GHz and 4.8 GHzin archival VLA data, making RBS 797 the first galaxy cluster found to havefour equidistant, centrally-symmetric, radio-filled cavities. We derive thedynamical and radiative ages of the four cavities from X-ray and radio data,respectively, finding that the two outbursts are approximately coeval, with anage difference of $\lessapprox$10 Myr between the E-W and N-S cavities. Wediscuss two scenarios for the origin of the two perpendicular, equidistantcavity systems: either the presence of a binary AGN which is excavating coevalpairs of cavities in perpendicular directions, or a fast ($<$10 Myr) jetreorientation event which produced subsequent, misaligned outbursts.

The deepest $Chandra$ view of RBS 797: evidence for two pairs of equidistant X-ray cavities