Diffuse Radio Emission from Galaxy Clusters

Abstract

In a growing number of galaxy clusters diffuse extended radio sources have been found. These sources are not directly associated with individual cluster galaxies. The radio emission reveal the presence of cosmic rays and magnetic fields in the intracluster medium (ICM). We classify diffuse cluster radio sources into radio halos, cluster radio shocks (relics), and revived AGN fossil plasma sources. Radio halo sources can be further divided into giant halos, mini-halos, and possible `intermediate' sources. Halos are generally positioned at cluster center and their brightness approximately follows the distribution of the thermal ICM. Cluster radio shocks (relics) are polarized sources mostly found in the cluster's periphery. They trace merger induced shock waves. Revived fossil plasma sources are characterized by their radio steep-spectra and often irregular morphologies. In this review we give an overview of the properties of diffuse cluster radio sources, with an emphasis on recent observational results. We discuss the resulting implications for the underlying physical acceleration processes that operate in the ICM, the role of relativistic fossil plasma, and the properties of ICM shocks and magnetic fields. We also compile an updated list of diffuse cluster radio sources which will be available on-line http://galaxyclusters.com. We end this review with a discussion on the detection of diffuse radio emission from the cosmic web.

To appear in Space Science Reviews, 56 pages, 31 figures; For associated data see http://galaxyclusters.com

References in corpus (118)

• Shocks and cold fronts in galaxy clusters
• Galaxy Clusters Discovered via the Sunyaev-Zel'dovich Effect in the 2500-square-degree SPT-SZ survey
• The LOFAR Two-metre Sky Survey - I. Survey Description and Preliminary Data Release
• GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey I: A low-frequency extragalactic catalogue
• The Quiescent Intracluster Medium in the Core of the Perseus Cluster
• Revised equipartition & minimum energy formula for magnetic field strength estimates from radio synchrotron observations
• Particle Acceleration on Megaparsec Scales in a Merging Galaxy Cluster
• Compressible Turbulence in Galaxy Clusters: Physics and Stochastic Particle Re-acceleration
• Observations of extended radio emission in clusters
• On the connection between giant radio halos and cluster mergers
• A low-frequency radio halo associated with a cluster of galaxies
• NuSTAR Observations of the Bullet Cluster: Constraints on Inverse Compton Emission
• Temperature profiles of a representative sample of nearby X-ray galaxy clusters
• Radio signature of cosmological structure formation shocks
• GMRT Radio Halo Survey in galaxy clusters at z = 0.2 -- 0.4. II.The eBCS clusters and analysis of the complete sample
• GMRT Radio Halo Survey in galaxy clusters at z = 0.2 -- 0.4 I.The REFLEX sub--sample
• Statistics of Giant Radio Halos from Electron Reacceleration Models
• Giant Ringlike Radio Structures Around Galaxy Cluster Abell 3376
• Simulating cosmic rays in clusters of galaxies - II. A unified scheme for radio halos and relics with predictions of the gamma-ray emission
• Non-Thermal Electron Acceleration in Low Mach Number Collisionless Shocks. I. Particle Energy Spectra and Acceleration Mechanism
• Do radio core-halos and cold fronts in non major merging clusters originate from the same gas sloshing?
• Cosmic rays and Radio Halos in galaxy clusters : new constraints from radio observations
• Resolved magnetic dynamo action in the simulated intracluster medium
• Shock acceleration as origin of the radio relic in A521?
• Deep 1.4 GHz VLA Observations of the Radio Halo and Relic in Abell 2256
• On the amplification of magnetic fields in cosmic filaments and galaxy clusters
• Simulations of extragalactic magnetic fields and of their observables
• Double relics in Abell 2345 and Abell 1240: spectral index and polarization analysis
• A new double radio relic in PSZ1 G096.89+24.17 and a radio relic mass-luminosity relation
• Magnetic Fields in the Center of the Perseus Cluster
• Non-Thermal Electron Acceleration in Low Mach Number Collisionless Shocks. II. Firehose-Mediated Fermi Acceleration and its Dependence on Pre-Shock Conditions
• Turbulence and Particle Acceleration in Giant Radio Haloes: the Origin of Seed Electrons
• New scaling relations in cluster radio halos and the re-acceleration model
• Gentle re-energisation of electrons in merging galaxy clusters
• Shock heating of the merging galaxy cluster A521
• Relativistic protons in the Coma galaxy cluster: first gamma-ray constraints ever on turbulent reacceleration
• The Extended GMRT Radio Halo Survey II: Further results and analysis of the full sample
• Deep VLA observations of the cluster 1RXS J0603.3+4214 in the frequency range 1-2 GHz
• Deep radio observations of the radio halo of the bullet cluster 1E 0657-55.8
• Galaxy Clusters in the Swift/BAT era: Hard X-rays in the ICM
• Low-Frequency study of two clusters of galaxies: A2744 and A2219
• Gamma rays from clusters of galaxies
• Internal dynamics of the radio-halo cluster A2744
• A giant radio halo in the cool core cluster CL1821+643
• A $\mathcal{M}\gtrsim 3$ shock in `El Gordo' cluster and the origin of the radio relic
• LOFAR discovery of an ultra-steep radio halo and giant head-tail radio galaxy in Abell 1132
• Deep LOFAR observations of the merging galaxy cluster CIZA J2242.8+5301
• Discovery of diffuse radio emission at the center of the most X-ray-luminous cluster RX J1347.5-1145
• Testing cosmic-ray acceleration with radio relics: a high-resolution study using MHD and tracers
• MC^2: Constraining the Dark Matter Distribution of the Violent Merging Galaxy Cluster CIZA J2242.8+5301 by Piercing through the Milky Way
• Nonthermal phenomena in clusters of galaxies
• Wideband VLA Observations of Abell 2256 I: Continuum, Rotation Measure and Spectral Imaging
• The Cosmic Large-Scale Structure in X-rays (CLASSIX) Cluster Survey I: Probing galaxy cluster magnetic fields with line of sight rotation measures
• Spectral age modelling of the `Sausage' cluster radio relic
• VLA Radio Observations of the HST Frontier Fields Cluster Abell 2744: The Discovery of New Radio Relics
• Relics in galaxy clusters at high radio frequencies
• Chandra and JVLA observations of HST Frontier Fields cluster MACS J0717.5+3745
• Deep Westerbork observations of Abell 2256 at 350 MHz
• Revised statistics of radio halos and the re-acceleration model
• Nonthermal Emission Associated with Strong AGN Outbursts at the Centers of Galaxy Clusters
• Multiple density discontinuities in the merging galaxy cluster CIZA J2242.8+5301
• On the absence of radio halos in clusters with double relics
• The Impact of Galaxy Cluster Mergers on Cosmological Parameter Estimation from Surveys of the Sunyaev-Zel'dovich Effect
• Mapping the particle acceleration in the cool core of the galaxy cluster RX J1720.1+2638
• The radio relic in Abell 2256: overall spectrum and implications for electron acceleration
• INTEGRAL discovery of non-thermal hard X-ray emission from the Ophiuchus cluster
• Cluster Abell 520: a perspective based on member galaxies. A cluster forming at the crossing of three filaments?
• A morphological comparison between giant radio halos and radio mini--halos in galaxy clusters
• Cross-correlating the gamma-ray sky with catalogs of galaxy clusters
• The dynamical status of the galaxy cluster Abell 115
• Evolution of cosmic filaments and of their galaxy population from MHD cosmological simulations
• MC^2: Galaxy Imaging and Redshift Analysis of the Merging Cluster CIZA J2242.8+5301
• New giant radio sources and underluminous radio halos in two galaxy clusters
• Internal dynamics of the massive cluster Abell 697: a multiwavelength analysis
• The first Murchison Widefield Array low frequency radio observations of cluster scale non-thermal emission: the case of Abell 3667
• Mpc-scale diffuse radio emission in two massive cool-core clusters of galaxies
• An Efficient Fokker-Planck Solver and its Application to Stochastic Particle Acceleration in Galaxy Clusters
• The highest-frequency detection of a radio relic: 16-GHz AMI observations of the `Sausage' cluster
• Abell 1033: birth of a radio phoenix
• Internal dynamics of the radio halo cluster Abell 773: a multiwavelength analysis
• MC${}^2$: Subaru and Hubble Space Telescope Weak-Lensing Analysis of the Double Radio Relic Galaxy Cluster PLCK G287.0+32.9
• A NuSTAR observation of the center of the Coma Cluster
• ALMA-SZ Detection of a Galaxy Cluster Merger Shock at Half the Age of the Universe
• Testing Secondary Models for the Origin of Radio Mini-Halos in Galaxy Clusters
• Can giant radio halos probe the merging rate of galaxy clusters?
• MC${}^2$: Dynamical Analysis of the Merging Galaxy Cluster MACS J1149.5+2223
• Detection of diffuse radio emission at large distance from the center of the galaxy cluster A2255
• A distant radio mini-halo in the Phoenix galaxy cluster
• Observations of the galaxy cluster CIZA J2242.8+5301 with the Sardinia Radio Telescope
• New Limits On Gamma-Ray Emission From Galaxy Clusters
• No Shock Across Part of a Radio Relic in the Merging Galaxy Cluster ZwCl 2341.1+0000?
• Early Science with the Karoo Array Telescope: a Mini-Halo Candidate in Galaxy Cluster Abell 3667
• A study of diffuse radio sources and X-ray emission in six massive clusters
• Discovery of a radio relic in the low mass, merging galaxy cluster PLCK G200.9-28.2
• How unusual is the cool-core radio halo cluster CL1821+643 ?
• A Radio and X-ray Study of the Merging Cluster A2319
• Non-thermal emission in the core of Perseus: results from a long XMM-Newton observation
• Diffuse cluster-like radio emission in poor environments
• Evidence for a pressure discontinuity at the position of the Coma relic from Planck Sunyaev-Zel'dovich effect data
• Optical analysis of the poor clusters Abell 610, Abell 725, and Abell 796, containing diffuse radio sources
• Diffuse radio sources in the cluster of galaxies Abell 548b
• Internal dynamics of the galaxy cluster Abell 959
• Diffuse radio emission in MACS J0025.4$-$1222: the effect of a major merger on bulk separation of ICM components
• The Swift BAT Perspective on Non-thermal Emission in HIFLUGCS Galaxy Clusters
• A Radio Relic and a Search for the Central Black Hole in the Abell 2261 Brightest Cluster Galaxy
• Diffuse Radio Emission in Abell 754
• Discovery of a fourth arc in Abell 2626 at 610 MHz with the GMRT: Spectral properties and possibilities for the origin
• MC^2: A deeper look at ZwCl 2341.1+0000 with Bayesian galaxy clustering and weak lensing analyses
• First detection at 5.5 and 9 GHz of the radio relics in bullet cluster with ATCA
• Radio emission from weak spherical shocks in the outskirts of galaxy clusters
• The structure of Abell 1351: a bimodal galaxy cluster with peculiar diffuse radio emission
• Shock Acceleration Model with Postshock Turbulence for Giant Radio Relics
• Tracing low-mass galaxy clusters with radio relics: the discovery of Abell 3527-bis
• Suzaku and Chandra observations of the galaxy cluster RXC J1053.7+5453 with a radio relic
• Diffuse radio emission in the complex merging galaxy cluster Abell 2069
• Complex diffuse emission in the $z=0.52$ cluster PLCK~G004.5-19.5
• A search for extended radio emission from selected compact galaxy groups
• Probing magnetic fields with Square Kilometre array and its precursors

Cited by in corpus (9)

• NGC 326: X-shaped no more
• Shocks and non-thermal particles in clusters of galaxies
• Detecting shocked intergalactic gas with X-ray and radio observations
• Interactions Between Radio Galaxies and Cluster Shocks - 1: Jet Axes Aligned with Shock Normals
• Observations of a Pre-Merger Shock in Colliding Clusters of Galaxies
• The Dust and Molecular Gas in the Brightest Cluster Galaxy in MACS 1931.8-2635
• A merger shock in Abell 1367
• Signatures from a merging galaxy cluster and its AGN population: LOFAR observations of Abell 1682
• Magnetic fields and extraordinarily bright radio emission in the X-ray faint galaxy group MRC 0116+111