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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