MeerKAT's View of the Bullet Cluster 1E 0657-55.8

Abstract

The Bullet cluster (1E 0657-55.8) is a massive merging system at redshift $z$=0.296, known to host a powerful radio halo and a relic. Here we present high fidelity MeerKAT L-band (0.9-1.7 GHz) observations of the Bullet cluster, in which we trace a larger extent of both the radio halo and relic in comparison to previous studies. The size of the recovered radio halo is 1.6 Mpc $\times$ 1.3 Mpc and the largest linear size of the relic is ~988 kpc. We detect a new decrement feature on the southern outskirts of the halo emission, where a region appears to have a lower surface brightness in comparison to its surroundings. The larger extension on the outskirts of the halo is faint, which suggests lower relativistic electron density or a weaker magnetic field. An in-band spectral index map of the radio halo reveals a hint of radial steepening towards the edges of the diffuse source, likely due to synchrotron electron ageing. The integrated spectral index of the radio halo is 1.1$\pm$0.2. We perform a radio-X-ray surface brightness point-to-point analysis, which reveals a linear correlation for the radio halo. This indicates that the radio halo emission is produced by primary re-acceleration mechanisms. Finally, we derive a radio Mach number of M_R= 4.6$\pm$0.9 for the relic shock region, which is higher than the Mach number inferred by earlier analyses based on X-ray data. Discrepancies between radio and X-ray Mach numbers have been observed for multiple systems, with studies suggesting that this is due to various factors, including relic orientation.

arXiv comment11 pages, 6 figures. Revised and accepted version; accepted by MNRAS

References in corpus (86)

• A direct empirical proof of the existence of dark matter
• Some Aspects of Measurement Error in Linear Regression of Astronomical Data
• WSClean: an implementation of a fast, generic wide-field imager for radio astronomy
• Weak lensing mass reconstruction of the interacting cluster 1E0657-558: Direct evidence for the existence of dark matter
• Clusters of galaxies : observational properties of the diffuse radio emission
• A Textbook Example of a Bow Shock in the Merging Galaxy Cluster 1E0657-56
• Cosmic rays in galaxy clusters and their non-thermal emission
• Particle reacceleration in Coma cluster: radio properties and hard X-ray emission
• Bow shock and radio halo in the merging cluster A520
• An optimized algorithm for multi-scale wideband deconvolution of radio astronomical images
• Strong and weak lensing united III: Measuring the mass distribution of the merging galaxy cluster 1E0657-56
• The Atacama Cosmology Telescope: A Catalog of > 4000 Sunyaev-Zel'dovich Galaxy Clusters
• A Powerful Radio Halo in the Hottest Known Cluster of Galaxies 1E0657-56
• A Comparison of Radio and X-Ray Morphologies of Four Clusters of Galaxies Containing Radio Halos
• Cluster mergers and non-thermal phenomena: expectations from a statistical magneto-turbulent model
• A Cluster Merger and the Origin of the Extended Radio Emission in Abell 3667
• Revisiting scaling relations for giant radio halos in galaxy clusters
• Radio signature of cosmological structure formation shocks
• The Case for Electron Re-Acceleration at Galaxy Cluster Shocks
• LOFAR, VLA, and Chandra observations of the Toothbrush galaxy cluster
• Radio Halo and Relic Candidates from the Westerbork Northern Sky Survey
• 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
• Giant radio relics in galaxy clusters: reacceleration of fossil relativistic electrons?
• Simulating cosmic rays in clusters of galaxies - II. A unified scheme for radio halos and relics with predictions of the gamma-ray emission
• Radio halos in nearby (z < 0.4) clusters of galaxies
• Revival of the magnetar PSR J1622-4950: observations with MeerKAT, Parkes, XMM-Newton, Swift, Chandra, and NuSTAR
• Discovery of radio halos and double-relics in distant MACS galaxy clusters: clues to the efficiency of particle acceleration
• Evidence for particle re-acceleration in the radio relic in the galaxy cluster PLCKG287.0 +32.9
• Alfvenic reacceleration of relativistic particles in galaxy clusters: MHD waves, leptons and hadrons
• Spectral ageing in the lobes of FR-II radio galaxies: New methods of analysis for broadband radio data
• 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
• The giant radio halo in Abell 2163
• Stochastic reacceleration of relativistic electrons by turbulent reconnection: a mechanism for cluster-scale radio emission ?
• The MeerKAT Galaxy Cluster Legacy Survey I. Survey Overview and Highlights
• Shock acceleration efficiency in radio relics
• The 1.28 GHz MeerKAT DEEP2 Image
• Another shock for the Bullet cluster, and the source of seed electrons for radio relics
• 1E0657-56: A Contender for the Hottest Known Cluster of Galaxies
• The Atacama Cosmology Telescope: Physical Properties and Purity of a Galaxy Cluster Sample Selected via the Sunyaev-Zel'dovich Effect
• A new double radio relic in PSZ1 G096.89+24.17 and a radio relic mass-luminosity relation
• The Dynamical Status of the Cluster of Galaxies 1E0657-56
• Turbulence and Particle Acceleration in Giant Radio Haloes: the Origin of Seed Electrons
• Gentle re-energisation of electrons in merging galaxy clusters
• On the occurrence of Radio Halos in galaxy clusters - Insight from a mass-selected sample
• Properties of Merger Shocks in Merging Galaxy Clusters
• Alfvenic reacceleration of relativistic particles in galaxy clusters in the presence of secondary electrons and positrons
• The Extended GMRT Radio Halo Survey II: Further results and analysis of the full sample
• The Planck clusters in the LOFAR sky. I. LoTSS-DR2: new detections and sample overview
• Using Radio Halos and Minihalos to Measure the Distributions of Magnetic Fields and Cosmic-Rays in Galaxy Clusters
• Deep radio observations of the radio halo of the bullet cluster 1E 0657-55.8
• Do radio relics challenge diffusive shock acceleration?
• Spectral ageing in the lobes of cluster-centre FR-II radio galaxies
• The Radio Relics and Halo of El Gordo, a Massive $z=0.870$ Cluster Merger
• A Sunyaev-Zel'dovich take on cluster radio haloes -- I. Global scaling and bi-modality using Planck data
• A shock at the radio relic position in Abell 115
• The beautiful mess in Abell 2255
• The two-component giant radio halo in the galaxy cluster Abell 2142
• The Bullet cluster at its best: weighing stars, gas and dark matter
• Dissecting nonthermal emission in the complex multiple-merger galaxy cluster Abell 2744: Radio and X-ray analysis
• A plethora of diffuse steep spectrum radio sources in Abell 2034 revealed by LOFAR
• Chandra and JVLA observations of HST Frontier Fields cluster MACS J0717.5+3745
• New mysteries and challenges from the Toothbrush relic: wideband observations from 550 MHz to 8 GHz
• Exploring the spectral properties of radio relics I: Integrated spectral index and Mach number
• Physical insights from the spectrum of the radio halo in MACS J0717.5+3745
• The ultra-steep diffuse radio emission observed in the cool-core cluster RX J1720.1+2638 with LOFAR at 54 MHz
• Radio and X-ray connection in radio mini-halos: implications for hadronic models
• An Efficient Fokker-Planck Solver and its Application to Stochastic Particle Acceleration in Galaxy Clusters
• Particle re-acceleration and Faraday-complex structures in the RXC J1314.4-2515 galaxy cluster
• A comparative study of radio halo occurrence in SZ and X-ray selected galaxy cluster samples
• Discovering the most elusive radio relic in the sky: Diffuse Shock Acceleration caught in the act?
• The scaling relations and the fundamental plane for radio halos and relics of galaxy clusters
• Testing Secondary Models for the Origin of Radio Mini-Halos in Galaxy Clusters
• Observations of a Pre-Merger Shock in Colliding Clusters of Galaxies
• Shock Acceleration Model for the Toothbrush Radio Relic
• A joint XMM-NuSTAR observation of the galaxy cluster Abell 523: constraints on Inverse Compton emission
• A radio halo surrounding the Brightest Cluster Galaxy in RXCJ0232.2-4420: a mini-halo in transition ?
• A perfect power-law spectrum even at highest frequencies: The Toothbrush relic
• Radio observations of the double-relic galaxy cluster Abell 1240
• An ALMA+ACA measurement of the shock in the Bullet Cluster
• Is the Sunyaev-Zeldovich effect responsible for the observed steepening in the spectrum of the Coma radio halo ?
• GMRT 610 MHz observations of galaxy clusters in the ACT equatorial sample
• Properties and Spectral Behaviour of Cluster Radio Halos
• First detection at 5.5 and 9 GHz of the radio relics in bullet cluster with ATCA
• A low-frequency radio halo survey of the South Pole Telescope SZ-selected clusters with the GMRT

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• The prototypical major cluster merger Abell 754. I. Calibration of MeerKAT data and radio/X-ray spectral mapping of the cluster
• Probing particle acceleration in Abell 2256: from to 16 MHz to gamma rays
• Mapping dark matter in the Bullet Cluster using JWST imaging and spectroscopy
• Plasma Constraints on the Millicharged Dark Matter
• MeerKAT discovery of GHz radio emission extending from Abell 3017 toward Abell 3016