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When subhalos infall into galaxy clusters, their gas content is ram pressurestripped by the intracluster medium (ICM) and may turn into cometary tails. Wereport the discovery of two spectacular X-ray double tails in a single galaxycluster, Z8338, revealed by 70 ks Chandra observations. The brighter one, withan X-ray bolometric luminosity of $3.9 \times 10^{42}{\rm\ erg\ s}^{-1}$, is adetached tail stripped from the host halo and extended at least 250 kpc inprojection. The head of the detached tail is a cool core with the front tip ofthe cold front $\sim$ 30 kpc away from the nucleus of its former host galaxy.The cooling time of the detached cool core is $\sim 0.3$ Gyr. For the detachedgas, the gravity of the once-associated dark matter halo further enhances theRayleigh-Taylor (RT) instability. From its survival, we find that a magneticfield of a few $\mu$G is required to suppress the hydrodynamic instability. TheX-ray temperature in the tail increases from 0.9 keV at the front tip to 1.6keV in the wake region, which suggests the turbulent mixing with the hotterICM. The fainter double X-ray tail, with a total X-ray luminosity of $2.7\times 10^{42}{\rm\ erg\ s}^{-1}$, appears to stem from the cool core of asubcluster in Z8338, and likely was formed during the ongoing merger. Thisexample suggests that X-ray cool cores can be displaced and eventuallydestroyed by mergers, while the displaced cool cores can survive for someextended period of time.

A detached double X-ray tail in the merging galaxy cluster Z8338 with a large double tail