Y. Tang, S. M. Jia, H.H. Zhao, C. K. Li, H. Yu, Y. Chen, S.S. Weng, Xiao-Jun Zheng, H. Feng, L. M. Song, C. Z. Liu, F.J. Lu, S.N. Zhang, W. M. Yuan, S. Andreon, J.-F. Wang, W. W. Cui, J. Guan, C. C. Jin, Y. Liu, J. Zhang, H. S. Zhao, X.F. Zhao
We present deep X-ray observations of the nearby X-ray-luminous galaxy cluster Abell 1795 obtained with the Follow-up X-ray Telescope ( ), with a total exposure time of ∼ 480 ks. Exploiting the large field of view and low particle background of , we directly measured the radial temperature profile of A1795 out to R_200 with full azimuthal coverage, which was shown to increase in line with the radius within 6 Einstein Probe EP-FXT EP-FXT and then gradually decline toward larger radii. The surface-brightness residual map and 2D thermodynamic maps reveal a clockwise spiral structure extending from the cluster core towards the south-east, which traces low-temperature and low-entropy gas, which is also consistent with sloshing-induced cold fronts. In the north-west, the surface-brightness-enhanced region exhibits an arc-like high-temperature feature and both the temperature-derived and density-derived Mach numbers support the assumption that it is a weak shock. These substructures can be explained by a binary merger scenario: the perturbing subcluster induces sloshing during its first passage past the primary core and its subsequent return passage through the ICM might drive the shock towards the north-west. Our results indicate that relaxed galaxy clusters such as A1795 might still retain signatures of dynamical activity.