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Galaxies 2018, 6(4), 128; https://doi.org/10.3390/galaxies6040128

The Challenge of Detecting Intracluster Filaments with Faraday Rotation

1
Dipartimento di Fisica e Astronomia, Universitá di Bologna, Via Gobetti 93/2, 40129 Bologna, Italy
2
INAF-Istitituto di Radio Astronomia, via Gobetti 101, 40129 Bologna, Italy
3
Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, 41029 Hamburg, Germany
*
Authors to whom correspondence should be addressed.
Received: 28 September 2018 / Revised: 23 November 2018 / Accepted: 26 November 2018 / Published: 30 November 2018
(This article belongs to the Special Issue The Power of Faraday Tomography)
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Abstract

The detection of filaments in the cosmic web will be crucial to distinguish between the possible magnetogenesis scenarios, and future large polarization surveys will be able to shed light on their magnetization level. In this work, we use numerical simulations of galaxy clusters to investigate their possible detection. We compute the Faraday Rotation signal in intracluster filaments and compare it to its surrounding environment. We find that the expected big improvement in sensitivity with the SKA-MID will in principle allow the detection of a large fraction of filaments surrounding galaxy clusters. However, the contamination of the intrinsic Faraday Rotation of background polarized sources will represent a big limiter to the number of objects that can be significantly detected. We discuss possible strategies to minimize this effect and increase the chances of detection of the cosmic web with the large statistics expected from future surveys. View Full-Text
Keywords: galaxy clusters; general techniques; polarimetric; intergalactic medium; large-scale structure of Universe galaxy clusters; general techniques; polarimetric; intergalactic medium; large-scale structure of Universe
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Locatelli, N.; Vazza, F.; Domínguez-Fernández, P. The Challenge of Detecting Intracluster Filaments with Faraday Rotation. Galaxies 2018, 6, 128.

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