Discovery of galaxy clusters and a head-tail radio galaxy in the direction of globular cluster NGC 6752

We report on the discovery of CXOU J191100-595621 and CXOU J191012-595619, two galaxy clusters serendipitously detected in the direction of globular cluster NGC 6752, based on archival Chandra observations with a total exposure time of similar to 344 ks. The deep Chandra X-ray data enabled us to measure the properties of both systems. We found a redshift of z = 0.239 +/- 0.013 and z = 0.375 +/- 0.016, a temperature of kT = 3.32(-0.46)(+0.57) keV and kT = 3.71(-0.86)(+1.18) keV, an iron abundance of and and a rest-frame full band (0.5-7 keV) luminosity of and for CXOU J191100-595621 and CXOU J191012-595619, respectively. The temperature profile of CXOU J191100-595621 is found to decrease with decreasing radius, indicating a cool core in this cluster. The hydrostatic equilibrium estimation suggests that the clusters are moderately weighted, with and , respectively. We search for optical and radio counterparts of X-ray point sources in the clusters. Three active galactic nuclei are found, among which one is identified with a narrow-angle-tail radio galaxy, and one is found to be associated with the brightest central galaxy of CXOU J191100-595621.