Unravelling the origin of large-scale magnetic fields in galaxy clusters and beyond through faraday rotation measures with the SKA

Annalisa Bonafede, Franco Vazza, Marcus Brüggen, Takuya Akahori, Ettore Carretti, Sergio Colafrancesco, Luigina Feretti, Chiara Ferrari, Gabriele Giovannini, Federica Govoni, Johnston Hollitt Melanie, Matteo Murgia, Lawrence Rudnick, Anna Scaife, Valentina Vacca

    Research output: Contribution to journalConference article

    3 Scopus citations

    Abstract

    We investigate the possibility for the SKA to detect and study the magnetic fields in galaxy clusters and in the less dense environments surrounding them using Faraday Rotation Measures. To this end, we produce 3-dimensional magnetic field models for galaxy clusters of different masses and in different stages of their evolution, and derive mock rotation measure observations of background radiogalaxies. According to our results, already in phase I, we will be able to infer the magnetic field properties in galaxy clusters as a function of the cluster mass, down to 1013 solarmasses. Moreover, using cosmological simulations to model the gas density, we have computed the expected rotation measure through shock-fronts that occur in the intra-cluster medium during cluster mergers. The enhancement in the rotation measure due to the density jump will permit to constraint the magnetic field strength and structure after the shock passage. SKA observations of polarised sources located behind galaxy clusters will answer several questions about the magnetic field strength and structure in galaxy clusters, and its evolution with cosmic time.

    Original languageEnglish (US)
    Article number095
    JournalProceedings of Science
    Volume9-13-June-2014
    StatePublished - Jan 1 2014
    EventAdvancing Astrophysics with the Square Kilometre Array, AASKA 2014 - Giardini Naxos, Italy
    Duration: Jun 9 2014Jun 13 2014

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    Bonafede, A., Vazza, F., Brüggen, M., Akahori, T., Carretti, E., Colafrancesco, S., Feretti, L., Ferrari, C., Giovannini, G., Govoni, F., Melanie, J. H., Murgia, M., Rudnick, L., Scaife, A., & Vacca, V. (2014). Unravelling the origin of large-scale magnetic fields in galaxy clusters and beyond through faraday rotation measures with the SKA. Proceedings of Science, 9-13-June-2014, [095].