Limiting magnetic fields in the cosmic web with diffuse radio emission
Date Issued
2017
Author(s)
Brown, S.
•
Vernstrom, T.
•
•
Dolag, K.
•
Gaensler, B. M.
•
Staveley-Smith, L.
•
•
Haverkorn, M.
•
Kesteven, M.
•
Abstract
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 3σ 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) μG in filaments at the current epoch and a limit on the primordial magnetic field (PMF) of BPMF < 1.0 nG.
Volume
468
Issue
4
Start page
4246
Issn Identifier
0035-8711
Ads BibCode
2017MNRAS.468.4246B
Rights
open.access
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