The intra-cluster magnetic field in the double relic galaxy cluster Abell 2345

Abstract

Magnetic fields are ubiquitous in galaxy clusters, yet their radial profile, power spectrum, and connection to host cluster properties are poorly known. Merging galaxy clusters hosting diffuse polarized emission in the form of radio relics offer a unique possibility to study the magnetic fields in these complex systems. In this paper, we investigate the intra-cluster magnetic field in Abell 2345. This cluster hosts two radio relics that we detected in polarization with 1-2 GHz JVLA observations. X-ray XMM-Newton images show a very disturbed morphology. We derived the Rotation Measure (RM) of five polarized sources within $\sim$ 1 Mpc from the cluster center applying the RM synthesis. Both, the average RM and the RM dispersion radial profiles probe the presence of intra-cluster magnetic fields. Using the thermal electron density profile derived from X-ray analysis and simulating a 3D magnetic field with fluctuations following a power spectrum derived from magneto-hydrodynamical cosmological simulations, we build mock RM images of the cluster. We constrained the magnetic field profile in the eastern radio relic sector by comparing simulated and observed RM images. We find that, within the framework of our model, the data require a magnetic field scaling with thermal electron density as $B(r)\propto n_e(r)$. The best model has a central magnetic field (within a 200 kpc radius) of $2.8\pm 0.1$ $\mu$G. The average magnetic field at the position of the eastern relic is $\sim$0.3 $\mu$G, a factor 2.7 lower than the equipartition estimate.

20 pages, 13 figures, 6 tables, accepted for publication in MNRAS

References in corpus (22)

• WSClean: an implementation of a fast, generic wide-field imager for radio astronomy
• Diffuse Radio Emission from Galaxy Clusters
• Turbulence and Magnetic Fields in the Large Scale Structure of the Universe
• The 1% Concordance Hubble Constant
• Particle Acceleration on Megaparsec Scales in a Merging Galaxy Cluster
• Observations of extended radio emission in clusters
• The non-coplanar baselines effect in radio interferometry: The W-Projection algorithm
• An optimized algorithm for multi-scale wideband deconvolution of radio astronomical images
• Scaling Properties of a Complete X-ray Selected Galaxy Group Sample
• Resolved magnetic dynamo action in the simulated intracluster medium
• The intracluster magnetic field power spectrum in Abell 2255
• X-Ray morphological analysis of the Planck ESZ clusters
• Double relics in Abell 2345 and Abell 1240: spectral index and polarization analysis
• The intracluster magnetic field power spectrum in Abell 2382
• Dynamical evolution of magnetic fields in the intracluster medium
• The Cosmic Large-Scale Structure in X-rays (CLASSIX) Cluster Survey I: Probing galaxy cluster magnetic fields with line of sight rotation measures
• The distribution of polarized radio sources $>$15$\mu$Jy in GOODS-N
• WATCAT: a tale of wide-angle tailed radio galaxies
• Direction Dependent Corrections in Polarimetric Radio Imaging I : Characterizing the effects of the primary beam on full Stokes imaging
• Characterizing the Uncertainty in Cluster Magnetic Fields derived from Rotation Measures
• A study of halo and relic radio emission in merging clusters using the Murchison Widefield Array
• Faraday Rotation Measure Dependence on Galaxy Clusters Dynamics

Cited by in corpus (12)

• Intracluster magnetic filaments and an encounter with a radio jet
• The detection of cluster magnetic fields via radio source depolarisation
• Using the polarization properties of double radio relics to probe the turbulent compression scenario
• The MeerKAT Fornax Survey IV. A close look at the cluster physics through the densest rotation measure grid
• Turbulent magnetic fields in merging clusters: A case study of Abell 2146
• Unveiling The Origin of Peculiar Diffuse Radio Emission in Abell 1351
• Active galactic nuclei through the prism of galaxy clusters: bounds on axion-like particles
• Constraining the magnetic field in the galaxy cluster Abell 2142 using MeerKAT L-band polarisation data
• Rotation measure and synchrotron emission signatures in simulations of magnetized galactic discs
• Magnetic Fields in the Shapley Supercluster Core with POSSUM: Challenging Model Predictions
• Effective Viscosity in the Intracluster Medium During Magnetic Field Amplification via Turbulent Dynamo
• Timing the last major merger of galaxy clusters with large halo sparsity