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(Context) In recent years, our understanding of the cool cores of galaxyclusters has changed. Once thought to be relatively simple places where gascools and flows toward the centre, now they are believed to be very dynamicplaces where heating from the central Active Galactic Nucleus (AGN) andcooling, as inferred from active star formation, molecular gas, and Halphanebulosity, find an uneasy energetic balance. (Aims) We want to characterizethe X-ray properties of the nearby cool-core cluster Zw1742+3306, selectedbecause it is bright at X-ray (with a flux greater than 1e-11 erg/s/cm2 in the0.1-2.4 keV band) and Halpha wavelengths (Halpha luminosity > 1e40 erg/s).(Methods) We used Chandra data to analyze the spatial and spectral propertiesof the cool core of Zw1742+3306, a galaxy cluster at z=0.0757 that emits inHalpha and presents the brightest central galaxy located in a diffuse X-rayemission with multiple peaks in surface brightness. (Results) We show that theX-ray cool core of the galaxy cluster Zw1742+3306 is thermodynamically veryactive with evidence of cold fronts and a weak shock in the surface brightnessmap and of an apparently coherent, elongated structure with metallicity greaterthan the value measured in the surrounding ambient gas by about 50 per cent.This anisotropic structure is 280 x 90 kpc2 and is aligned with the cold frontsand with the X-ray emission on larger scales. We suggest that all thesepeculiarities in the X-ray emission of Zw1742+3306 are either a very fine-tunedoutput of a sloshing gas in the cluster core or the product of a metal-richoutflow from the central AGN.

Cold fronts and metal anisotropies in the X-ray cool core of the galaxy cluster Zw1742+3306