Chandra and JVLA observations of HST Frontier Fields cluster MACS J0717.5+3745

Abstract

To investigate the relationship between thermal and non-thermal components in merger galaxy clusters, we present deep JVLA and Chandra observations of the HST Frontier Fields cluster MACS J0717.5+3745. The Chandra image shows a complex merger event, with at least four components belonging to different merging subclusters. NW of the cluster, $\sim 0.7$ Mpc from the center, there is a ram-pressure-stripped core that appears to have traversed the densest parts of the cluster after entering the ICM from the direction of a galaxy filament to the SE. We detect a density discontinuity NNE of this core which we speculate is associated with a cold front. Our radio images reveal new details for the complex radio relic and radio halo in this cluster. In addition, we discover several new filamentary radio sources with sizes of 100-300 kpc. A few of these seem to be connected to the main radio relic, while others are either embedded within the radio halo or projected onto it. A narrow-angled-tailed (NAT) radio galaxy, a cluster member, is located at the center of the radio relic. The steep spectrum tails of this AGN leads into the large radio relic where the radio spectrum flattens again. This morphological connection between the NAT radio galaxy and relic provides evidence for re-acceleration (revival) of fossil electrons. The presence of hot $\gtrsim 20$ keV ICM gas detected by Chandra near the relic location provides additional support for this re-acceleration scenario.

22 pages, 15 figures, accepted for publication in ApJ

References in corpus (21)

• A direct empirical proof of the existence of dark matter
• WSClean: an implementation of a fast, generic wide-field imager for radio astronomy
• Shocks and cold fronts in galaxy clusters
• Multi-Scale CLEAN deconvolution of radio synthesis images
• Particle Acceleration on Megaparsec Scales in a Merging Galaxy Cluster
• The non-coplanar baselines effect in radio interferometry: The W-Projection algorithm
• Post-correlation radio frequency interference classification methods
• A complete sample of twelve very X-ray luminous galaxy clusters at z>0.5
• CLASH: Weak-Lensing Shear-and-Magnification Analysis of 20 Galaxy Clusters
• Contour binning: a new technique for spatially-resolved X-ray spectroscopy applied to Cassiopeia A
• Lens models and magnification maps of the six Hubble Frontier Fields clusters
• The Case for Electron Re-Acceleration at Galaxy Cluster Shocks
• Giant Ringlike Radio Structures Around Galaxy Cluster Abell 3376
• Hubble Frontier Fields First Complete Cluster Data: Faint Galaxies at $z\sim 5-10$ for UV Luminosity Functions and Cosmic Reionization
• Non-Thermal Electron Acceleration in Low Mach Number Collisionless Shocks. I. Particle Energy Spectra and Acceleration Mechanism
• 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
• Non-Thermal Electron Acceleration in Low Mach Number Collisionless Shocks. II. Firehose-Mediated Fermi Acceleration and its Dependence on Pre-Shock Conditions
• Wideband VLA Observations of Abell 2256 I: Continuum, Rotation Measure and Spectral Imaging
• The spatial distribution of galaxies of different spectral types in the massive intermediate-redshift cluster MACSJ0717.5+3745
• An X-ray/optical study of the complex dynamics of the core of the massive intermediate-redshift cluster MACSJ0717.5+3745

Cited by in corpus (26)

• Diffuse Radio Emission from Galaxy Clusters
• Deep VLA observations of the cluster 1RXS J0603.3+4214 in the frequency range 1-2 GHz
• MeerKAT view of the diffuse radio sources in Abell 3667 and their interactions with the thermal plasma
• VLA Radio Observations of the HST Frontier Fields Cluster Abell 2744: The Discovery of New Radio Relics
• Physical insights from the spectrum of the radio halo in MACS J0717.5+3745
• Polarisation of Radio Relics in Galaxy Clusters
• Deep low-frequency radio observations of Abell 2256 I: The filamentary radio relic
• Radio fossils, relics, and haloes in Abell 3266: cluster archaeology with ASKAP-EMU and the ATCA
• A Robust Model for Flux Density Calculations of Radio Halos in Galaxy Clusters: Halo-FDCA
• Understanding the radio relic emission in the galaxy cluster MACS J0717.5+3745: spectral analysis
• Deep low-frequency radio observations of Abell 2256 II: The ultra-steep spectrum radio halo
• Evidence for a merger induced shock wave in ZwCl\,0008.8+5215 with {\it Chandra} and {\it Suzaku}
• Turbulent magnetic fields in the merging galaxy cluster MACS J0717.5+3745: polarization analysis
• Morphology of radio relics II: Properties of polarised emission
• A Massive Cluster at z = 0.288 Caught in the Process of Formation: The Case of Abell 959
• The VLA Frontier Field Survey: A Comparison of the Radio and UV/optical size of $0.3\lesssim z\lesssim 3$ star-forming galaxies
• VLA resolves unexpected radio structures in the Perseus cluster of galaxies
• MeerKAT's View of the Bullet Cluster 1E 0657-55.8
• Diffuse Radio Sources in a Statistically Complete Sample of High Redshift Galaxy Clusters
• JVLA 1.5GHz continuum observation of CLASH clusters I: radio properties of the BCGs
• The VLA Frontier Fields Survey: Deep, High-resolution Radio Imaging of the MACS Lensing Clusters at 3 and 6 GHz
• The correlation between radio power and Mach number for radio relics in galaxy clusters
• A low-frequency radio halo survey of the South Pole Telescope SZ-selected clusters with the GMRT
• The MeerKAT Massive Distant Clusters Survey: A Radio Halo in a Massive Galaxy Cluster at z = 1.23
• The thermodynamic structure and large-scale structure filament in MACS J0717.5+3745
• A high-resolution study of the double radio relic system in MACS J1752.0+4440