“…Sunyaev and Zeldovich, 1972;Markevitch and Vikhlinin, 2007;Bykov et al, 2008a;Kushnir and Waxman, 2009;Brüggen et al, 2012;Cavaliere and Lapi, 2013). Around galaxy clusters, strong M ≥ 10−10 2 accretion shocks should exist in a quasi-stationary way and mark the transition from smooth infalling matter to halos undergoing their virialisation process, as illustrated in the top panels of Fig.1 (Miniati et al, 2000;Ryu et al, 2003b;Pfrommer et al, 2006;Vazza et al, 2009;Planelles and Quilis, 2013;Schaal et al, 2016;Martin-Alvarez et al, 2017). The statistics of shocks in the Universe is predicted to be dominated by structure formation shocks, with only a minor contribution from non-gravitational processes, as shown in the bottom left panel of Fig.1 (e.g.…”