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The thermal, chemical, and kinematic properties of the potentiallymulti-phase circum/inter-galactic medium at the virial radii of galaxy clustersremain largely uncertain. We present an X-ray study of Abell 2246 and GMBCGJ255.34805+64.23661 (z=0.23 and 0.45), two foreground clusters of the UV-brightQSO HS 1700+6416, based on 240 ks Chandra/ACIS-I observations. We detectenhanced diffuse X-ray emission to the projected distances beyond r_{200} radiiof these two clusters. The large-scale X-ray emission is consistent with beingazimuthally symmetric at the projected radii of the QSO (0.36 and 0.8 times theradii of the two clusters). Assuming a spherical symmetry, we obtain thede-projected temperature and density profiles of the X-ray-emitting gas.Excluding the cool cores that are detected, we find that the mean temperatureof the hot gas is about 4.0 keV for Abell 2246 and 5.5 keV for GMBCGJ255.34805+64.23661, although there are indications for temperature drop atlarge radii. From these results, we can estimate the density and pressuredistributions of the hot gas along the QSO sightline. We further infer theradial entropy profile of Abell 2246 and compare it with the one expected frompurely gravitational hierarchical structure formation. This comparison showsthat the ICM in the outer region of the clusters is likely in a clumpy andmulti-phased state. These results, together with the upcoming HST/COSobservations of the QSO sightline, will enable a comprehensive investigation ofthe multi-phase medium associated with the clusters.

X-ray mapping the outer regions of galaxy clusters at z= 0.23 and 0.45