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      Coincident SZ and \(\gamma\)-ray signals from cluster virial shocks

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          Abstract

          Virial shocks around galaxy clusters are expected to show a cutoff in the thermal Sunyaev-Zel'dovich (SZ) signal, coincident with a leptonic ring. However, until now, leptonic signals were reported only in Coma and in stacked Fermi-LAT clusters, and an SZ shock signal was reported only in A2319. We point out that a few clusters --- presently Coma, A2319, and A2142 --- already show sharp drops in Planck SZ pressure near the virial radius, coincident with a LAT \(\gamma\)-ray excess. These signatures are shown to trace the virial shocks of the clusters, at joint medium to high confidence levels. The electron acceleration rates inferred from \(\gamma\)-rays are consistent with previous measurements. Lower limits of order a few are imposed on the shock Mach numbers.

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          Metadata Management in Global Distributed Ocean Observation Networks

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            Author and article information

            Journal
            04 January 2018
            Article
            1801.01494

            http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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            10 pages, 7 figures, comments welcome
            astro-ph.CO astro-ph.HE

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