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Abstract: In galaxy clusters the entropy distribution of the IntraCluster Plasmamodulates the latter-s equilibrium within the Dark Matter gravitational wells,as rendered by our Supermodel. We argue the entropy production at the boundaryshocks to be reduced or terminated as the accretion rates of DM andintergalactic gas peter out; this behavior is enforced by the slowdown in theoutskirt development at late times, when the Dark Energy dominates thecosmology while the outer wings of the initial perturbation drive the growth.In such conditions, we predict the ICP temperature profiles to steepen into thecluster outskirts. The detailed expectations from our simple formalism agreewith the X-ray data concerning five clusters whose temperature profiles havebeen recently measured out to the virial radius. We predict steep temperaturedeclines to prevail in clusters at low redshift, tempered only by rich environsincluding adjacent filamentary structures.



Author: A. Lapi 1,2, R. Fusco-Femiano 3, A. Cavaliere 1 1-Univ. 'Tor Vergata', Roma, Italy, 2-SISSA-ISAS, Trieste, Italy, 3-INA

Source: https://arxiv.org/







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