Direct probes of Dark Matter in the cluster 1ES0657-556 through microwave observations

Abstract

The cluster 1ES0657-556 is an ideal astrophysical laboratory to study the distribution and the nature of Dark Matter because this last component is spatially separated from the intracluster gas. We show that microwave observations can provide crucial probes of Dark Matter in this system. We calculate the expected SZ effect from Dark Matter annihilation in the main mass concentrations of the cluster 1ES0657-556, and we estimate the sources of contamination, confusion and bias to asses its significance. We find that SZ observations at a frequency of 223 GHz can resolve both spatially and spectrally the SZ_DM signal and isolate it from the other SZ signals, and mainly from the thermal SZ effect which is null at frequencies 220-223 GHz for the case of 1ES0657-556. We conclude that SZ observations with sub-arcmin resolution and micro-K sensitivity of 1ES0657-556 are crucial, and maybe unique, to find direct astrophysical probes of the existence and of the nature of Dark Matter, or to set strong experimental limits.

arXiv comment5 pages, 2 figures, A&A Letters in press

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Cited by in corpus (8)

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• Gamma Rays from Clusters and Groups of Galaxies: Cosmic Rays versus Dark Matter
• Searching for Dark Matter with X-ray Observations of Local Dwarf Galaxies
• Cosmic Frontier Indirect Dark Matter Detection Working Group Summary
• Multi-wavelength Searches for Particle Dark Matter
• An approximate theory for substructure propagation in clusters
• Through a Mini Halo, Darkly
• Dark matter annihilation and non-thermal Sunyaev-Zel'dovich effect: II. dwarf spheroidal galaxy