The diffuse radio emission from the Coma cluster at 2.675 GHz and 4.85 GHz

Abstract

We present new measurements of the diffuse radio halo emission from the Coma cluster of galaxies at 2.675 GHz and 4.85 GHz using the Effelsberg 100--m telescope. After correction for the contribution from point sources we derive the integrated flux densities for the halo source (Coma C), $S_{2.675GHz}=(107\pm 28)mJy$ and $S_{4.85GHz}=(26\pm 12)mJy$. These values verify the strong steepening of the radio spectrum of Coma C at high frequencies. Its extent strongly depends on frequency, at 4.85 GHz it is only marginally visible. The measurement at 4.85 GHz is the first flux density determination for Coma C at this high frequency. In order to quantify the spectral steepening we compare the expectations for the spectrum of Coma C with the observations, resorting to basic models for radio halo formation. The in--situ acceleration model provides the best fit to the data. From equipartition assumptions we estimate a magnetic field strength $B_{eq}=0.57(1+k{)}^{0.26}\mu G$ in the intracluster medium of Coma, where k is the energy ratio of the positively and negatively charged particles. As a by--product of the 2.675 GHz observation we present a new flux density for the diffuse emission of the extended source 1253+275 ($S_{2.675GHz}=112\pm 10$). This measurement provides a smaller error range for the power--law fit to the spectrum ($\alpha =1.18\pm 0.02$) compared to previous investigations and yields an equipartition magnetic field strength of $B_{eq}=0.56(1+k{)}^{0.24}\mu G$.

10 pages with 9 PostScript figures. Accepted for publication in A&A, latest revision includes minor changes at page proof correction stage

Cited by in corpus (125)

• Clusters of galaxies : observational properties of the diffuse radio emission
• Cosmic rays in galaxy clusters and their non-thermal emission
• Magnetic Field in Clusters of Galaxies
• Diffuse Radio Emission from Galaxy Clusters
• Revised equipartition & minimum energy formula for magnetic field strength estimates from radio synchrotron observations
• The Coma cluster magnetic field from Faraday rotation measures
• Observations of extended radio emission in clusters
• Constraining the population of cosmic ray protons in cooling flow clusters with gamma-ray and radio observations: Are radio mini-halos of hadronic origin?
• Evolving turbulence and magnetic fields in galaxy clusters
• NuSTAR Observations of the Bullet Cluster: Constraints on Inverse Compton Emission
• Multi-frequency analysis of neutralino dark matter annihilations in the Coma cluster
• EGRET upper limits on the high-energy gamma-ray emission of galaxy clusters
• Cosmic ray transport in galaxy clusters: implications for radio halos, gamma-ray signatures, and cool core heating
• On the evolution of giant radio halos and their connection with cluster mergers
• Acceleration of primary and secondary particles in galaxy clusters by compressible MHD turbulence: from radio halos to gamma rays
• Radio halos in nearby (z < 0.4) clusters of galaxies
• Alfvenic reacceleration of relativistic particles in galaxy clusters: MHD waves, leptons and hadrons
• Shock acceleration as origin of the radio relic in A521?
• Rise and Fall of Radio Halos in Simulated Merging Galaxy Clusters
• Deep 1.4 GHz VLA Observations of the Radio Halo and Relic in Abell 2256
• Search for gamma-ray emission from the Coma Cluster with six years of Fermi-LAT data
• Constraints on Cosmic Rays, Magnetic Fields, and Dark Matter from Gamma-Ray Observations of the Coma Cluster of Galaxies with VERITAS and Fermi
• Relativistic protons in the Coma galaxy cluster: first gamma-ray constraints ever on turbulent reacceleration
• The Planck clusters in the LOFAR sky. I. LoTSS-DR2: new detections and sample overview
• Galaxy Clusters in the Swift/BAT era: Hard X-rays in the ICM
• Probing the origin of giant radio halos through radio and gamma-ray data : the case of the Coma cluster
• Measurements and simulation of Faraday rotation across the Coma radio relic
• Imprint of Intergalactic Shocks on the Radio Sky
• Gamma rays from clusters of galaxies
• Spectral properties and origin of the radio halo in A3562
• LOFAR discovery of an ultra-steep radio halo and giant head-tail radio galaxy in Abell 1132
• Constraints on the multi-TeV particle population in the Coma Galaxy Cluster with H.E.S.S. observations
• Hard X-ray and Gamma-ray Emission Induced by Ultra-High Energy Protons in Cluster Accretion Shocks
• Nonthermal phenomena in clusters of galaxies
• Constraints on diffuse gamma-ray emission from structure formation processes in the Coma cluster
• Implications of Fermi Observations for Hadronic Models of Radio Halos in Clusters of Galaxies
• On the connection between turbulent motions and particle acceleration in galaxy clusters
• Dissecting nonthermal emission in the complex multiple-merger galaxy cluster Abell 2744: Radio and X-ray analysis
• Diffuse radio emission in the merging cluster MACS J0717.5+3745: the discovery of the most powerful radio halo
• Soft X-ray Excess in the Coma Cluster from a Cosmic Axion Background
• New mysteries and challenges from the Toothbrush relic: wideband observations from 550 MHz to 8 GHz
• Radio Halos From Simulations And Hadronic Models I: The Coma cluster
• Heating and Acceleration of Intracluster Medium Electrons by Turbulence
• Suzaku observations of the merging galaxy cluster Abell2255: The northeast radio relic
• Exploring the spectral properties of radio relics I: Integrated spectral index and Mach number
• Intermittent jet activity in the radio galaxy 4C29.30?
• INTEGRAL discovery of non-thermal hard X-ray emission from the Ophiuchus cluster
• A Suzaku Search for Non-thermal Emission at Hard X-ray Energies in the Coma Cluster
• Constraints on Dark Matter Annihilation in Clusters of Galaxies from Diffuse Radio Emission
• Physical insights from the spectrum of the radio halo in MACS J0717.5+3745
• 153 MHz GMRT follow-up of steep-spectrum diffuse emission in galaxy clusters
• Galaxy Clusters in the Radio: Relativistic Plasma and ICM/Radio Galaxy Interaction Processes
• Radio Halos From Simulations And Hadronic Models II: The Scaling Relations of Radio Halos
• Suzaku X-Ray Observations of the Accreting NGC 4839 Group of Galaxies and the Radio Relic in the Coma Cluster
• Nonthermal radiation mechanisms
• X-ray study of the double radio relic Abell 3376 with Suzaku
• Magnetic fields from inflation: the transition to the radiation era
• A NuSTAR observation of the center of the Coma Cluster
• Particle acceleration and non-thermal emission from galaxy clusters
• Galaxy Clusters in the Swift/BAT era II: 10 more Clusters detected above 15 keV
• Detection of gamma-ray emission from the Coma cluster with Fermi Large Area Telescope and tentative evidence for an extended spatial structure
• The spectral index image of the radio halo in the cluster Abell 520 hosting a famous bow shock
• The discovery of radio halos in the Frontier Fields clusters Abell S1063 and Abell 370
• The Coma Cluster at gamma-ray energies: multifrequency constraints
• The EUV Emission in the Coma Cluster of Galaxies and the Underlying Source of this Radiation
• Modification of cluster radio halo appearance by the thermal Sunyaev-Zeldovich effect
• Astrophysical limits on light NMSSM neutralinos
• The impact of the SZ effect on cm-wavelength (1-30 GHz) observation of galaxy cluster radio relics
• Nonthermal emission from clusters of galaxies
• Analysis and Interpretation of Hard X-ray Emission from the Bullet Cluster (1E0657-56), the Most Distant Cluster of Galaxies Observed by RXTE
• CRESCENDO: An on-the-fly Fokker-Planck Solver for Spectral Cosmic Rays in Cosmological Simulations
• Suzaku Observations of the Galaxy Cluster 1RXS J0603.3+4214: Implications of Particle Acceleration Processes in "Toothbrush" Radio Relic
• Diagnostic Signatures of Radio and HXR Emission on Particle Acceleration Processes in the Coma Cluster
• A Multi-frequency analysis of dark matter annihilation interpretations of recent anti-particle and gamma-ray excesses in cosmic structures
• Mystery solved: discovery of extended radio emission in the merging galaxy cluster Abell 2146
• Searching for Intergalactic Shocks with the SKA
• Tempestuous life beyond R500: X-ray view on the Coma cluster with SRG/eROSITA. II. Shock & Relic
• The Lack of Diffuse, Nonthermal Hard X-ray Emission in the Coma Cluster: The Swift BAT's Eye View
• X-ray observations of the Coma Cluster in a broad energy band with INTEGRAL, RXTE, and ROSAT observatories
• High Energy Neutrinos from Cosmic Ray Interactions in Clusters of Galaxies
• Is the Sunyaev-Zeldovich effect responsible for the observed steepening in the spectrum of the Coma radio halo ?
• XMM-Newton observations of the Coma cluster relic 1253+275
• Where does the hard X-ray diffuse emission in clusters of galaxies come from?
• Testing the cosmic ray content in galaxy clusters
• Evidence for a pressure discontinuity at the position of the Coma relic from Planck Sunyaev-Zel'dovich effect data
• A Massive Cluster at z = 0.288 Caught in the Process of Formation: The Case of Abell 959
• Detailed study of extended gamma-ray morphology in the vicinity of the Coma cluster with Fermi-LAT
• Cosmic Ray Acceleration during Large Scale Structure Formation
• The Swift BAT Perspective on Non-thermal Emission in HIFLUGCS Galaxy Clusters
• Properties and Spectral Behaviour of Cluster Radio Halos
• Inverse-Compton Emission from Clusters of Galaxies: Predictions for ASTRO-H
• The role of Dark Matter sub-halos in the non-thermal emission of galaxy clusters
• Constraints on Cosmic Ray Transport in Galaxy Clusters from Radio and Gamma Ray Observations
• ALP Conversion and the Soft X-ray Excess in the Outskirts of the Coma Cluster
• Galaxy clusters in high definition: a dark matter search
• Radio halos and relics from extended cosmic-ray ion distributions with strong diffusion in galaxy clusters
• On the DM interpretation of the origin of non-thermal phenomena in galaxy clusters
• Reaching thermal noise at ultra-low radio frequencies: the Toothbrush radio relic downstream of the shock front
• Probing particle acceleration in Abell 2256: from to 16 MHz to gamma rays
• Double radio relics and radio halo in the high redshift galaxy cluster El Gordo with the Upgraded GMRT
• A Multi-frequency analysis of possible Dark Matter Contributions to M31 Gamma-Ray Emissions
• Sardinia Radio Telescope observations of the Coma Cluster
• Probing photon decay with the Sunyaev-Zel'dovich effect
• Properties of Polarized Synchrotron Emission from Fluctuation Dynamo Action -- II. Effects of Turbulence Driving in the ICM and Beam Smoothing
• Giant radio halos in galaxy clusters as probes of particle acceleration in turbulent regions
• Constraining annihilating dark matter by radio continuum spectrum of the Large Magellanic Cloud
• The Glow of Axion Quark Nugget Dark Matter: (II) Galaxy Clusters
• Spectral study of the diffuse synchrotron source in the galaxy cluster Abell 523
• Effect of turbulent reacceleration on electrons produced by dark matter annihilation in the Coma cluster
• Indirect detection prospects for d${}^{\ast }$(2380) dark matter
• The End of the Rainbow: What Can We Say About the Extragalactic Sub-Megahertz Radio Sky?
• Shape and connectivity of groups and clusters: Impact of dynamical state and accretion history
• One of Everything: The Breakthrough Listen Exotica Catalog
• CHEX-MATE: New detections and properties of the radio diffuse emission in massive clusters with MeerKAT
• Gamma-ray detection toward the Coma cluster with Fermi-LAT: Implications for the cosmic ray content in the hadronic scenario
• Gamma-ray emission from galaxy cluster outskirts versus radio relics
• The Coma cluster at LOFAR frequencies II: the halo, relic, and a new accretion relic
• Dark matter, extra-terrestrial gamma-rays and the MSSM: a viability study
• Pilot study and early results of the Cosmic Filaments and Magnetism Survey with Nenufar: the Coma cluster field
• Modelling Giant Radio Halos
• White Paper: Radio Emission and Polarization Properties of Galaxy Clusters with VLASS
• Constraints on dark matter annihilation and turbulent reacceleration set by high-frequency observations of the radio halo in the Coma cluster
• Observations of the galaxy cluster CL 0217+70 and its surrounding region at 1.4 GHz with the Sardinia Radio Telescope
• Low-frequency integrated radio spectra of diffuse, steep-spectrum sources in galaxy clusters: palaeontology with the MWA and ASKAP
• Probing the low-energy spectrum of non-thermal electrons in galaxy clusters with soft gamma ray observations