Limiting magnetic fields in the cosmic web with diffuse radio emission

S. Brown, T. Vernstrom, E. Carretti, K. Dolag, B. M. Gaensler, L. Staveley-Smith, G. Bernardi, M. Haverkorn, M. Kesteven, S. Poppi

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    We set limits on the presence of the synchrotron cosmic web through the cross-correlation of the 2.3 GHz S-PASS survey with a model of the local cosmic web derived from constrained magnetohydrodynamic (MHD) simulations. The MHD simulation assumes cosmologically seeded magnetic fields amplified during large-scale structure formation and a population of relativistic electrons/positrons from proton-proton collisions within the intergalactic medium. We set a model-dependent 3 sigma upper limit on the synchrotron surface brightness of 0.16 mJy arcmin-2 at 2.3 GHz in filaments. Extrapolating from magnetic field maps created from the simulation, we infer an upper limit (density-weighted) magnetic field of 0.03 (0.13) mu G in filaments at the current epoch and a limit on the primordial magnetic field (PMF) of B-PMF

    Original languageEnglish
    Pages (from-to)4246-4253
    Number of pages8
    JournalMonthly Notices of the Royal Astronomical Society
    Issue number4
    Publication statusPublished - Jul 2017

    Cite this

    Brown, S., Vernstrom, T., Carretti, E., Dolag, K., Gaensler, B. M., Staveley-Smith, L., Bernardi, G., Haverkorn, M., Kesteven, M., & Poppi, S. (2017). Limiting magnetic fields in the cosmic web with diffuse radio emission. Monthly Notices of the Royal Astronomical Society, 468(4), 4246-4253.