Abell 1430: A merging cluster with exceptional diffuse radio emission
arXiv:2010.10331 · doi:10.1051/0004-6361/202039725
Abstract
Diffuse radio emission has been found in many galaxy clusters, predominantly in massive systems which are in the state of merging. The radio emission can usually be classified as relic or halo emission, which are believed to be related to merger shocks or volume-filling turbulence, respectively. Recent observations have revealed radio bridges for some pairs of very closeby galaxy clusters. The mechanisms that may allow to explain the high specific density of relativistic electrons, necessary to explain the radio luminosity of these bridge regions, are poorly explored. We analyse the galaxy cluster Abell 1430 with LoTSS data in detail and complement it with recent JVLA L-band observations, XMM-Newton, Chandra, and SDSS data. Moreover, we compare our results to clusters extracted from the "The Three Hundred Project" cosmological simulation. We find that Abell 1430 consists of two components, namely A1430-A and A1430-B. We speculate that the two components undergo an off-axis merger. The more massive component shows diffuse radio emission which can be classified as radio halo showing a low radio power given the mass of the cluster. Most interestingly, there is extended diffuse radio emission, dubbed as the `Pillow', which is apparently related to A1430-B and thus related to low density intracluster or intergalactic medium. To date, a only few examples for emission originating from such regions are known. These discoveries are crucial to constrain possible acceleration mechanisms, which may allow to explain the presence of relativistic electrons in these regions. Our results indicate a spectral index of for the Pillow. If future observations confirm a slope as flat as the central value of -1.4 or even flatter, this would pose a severe challenge for the electron acceleration scenarios.
arXiv comment14 pages, 12 figures, accepted for publication in A&A
References in corpus (55)
- LOFAR: The LOw-Frequency ARray
- A Cosmology Calculator for the World Wide Web
- WSClean: an implementation of a fast, generic wide-field imager for radio astronomy
- Galaxy cluster X-ray luminosity scaling relations from a representative local sample (REXCESS)
- Clusters of galaxies : observational properties of the diffuse radio emission
- A Textbook Example of a Bow Shock in the Merging Galaxy Cluster 1E0657-56
- The LOFAR Two-metre Sky Survey - II. First data release
- Cosmic rays in galaxy clusters and their non-thermal emission
- The Northern ROSAT All-Sky (NORAS) Galaxy Cluster Survey I: X-ray Properties of Clusters Detected as Extended X-ray Sources
- Chandra temperature profiles for a sample of nearby relaxed galaxy clusters
- Planck Early Results: The Planck mission
- Diffuse Radio Emission from Galaxy Clusters
- Particle Acceleration on Megaparsec Scales in a Merging Galaxy Cluster
- An Accurate Flux Density Scale from 1 to 50 GHz
- The Fifteenth Data Release of the Sloan Digital Sky Surveys: First Release of MaNGA Derived Quantities, Data Visualization Tools and Stellar Library
- On the connection between giant radio halos and cluster mergers
- A GMBCG Galaxy Cluster Catalog of 55,424 Rich Clusters from SDSS DR7
- LOFAR facet calibration
- LOFAR 150-MHz observations of the Boötes field: Catalogue and Source Counts
- The LOFAR Two Meter Sky Survey: Deep Fields, I -- Direction-dependent calibration and imaging
- Faceting for direction-dependent spectral deconvolution
- Radio and X-ray diffuse emission in six clusters of galaxies
- The Three Hundred project: a large catalogue of theoretically modelled galaxy clusters for cosmological and astrophysical applications
- Revisiting scaling relations for giant radio halos in galaxy clusters
- Radio interferometric gain calibration as a complex optimization problem
- Universal thermodynamic properties of the intracluster medium over two decades in radius in the X-COP sample
- On The Origin of Radio Halos in Galaxy Clusters
- A radio ridge connecting two galaxy clusters in a filament of the cosmic web
- Radio halos in nearby (z < 0.4) clusters of galaxies
- Deep images of cluster radio halos
- XMM-Newton Observation of the Northwest Radio Relic Region in Abell 3667
- LOFAR observations of galaxy clusters in HETDEX
- LoCuSS: the connection between brightest cluster galaxy activity, gas cooling and dynamical disturbance of X-ray cluster cores
- Deep 1.4 GHz VLA Observations of the Radio Halo and Relic in Abell 2256
- The "toothbrush-relic": evidence for a coherent linear 2-Mpc scale shock wave in a massive merging galaxy cluster?
- Systematic X-ray Analysis of Radio Relic Clusters with SUZAKU
- An Optical Catalog of Galaxy Clusters Obtained from an Adaptive Matched Filter Finder Applied to SDSS DR6
- Non-linear Kalman filters for calibration in radio interferometry
- Double relics in Abell 2345 and Abell 1240: spectral index and polarization analysis
- Planck 2013 results. XXIX. The Planck catalogue of Sunyaev-Zeldovich sources: Addendum
- The XMM Cluster Outskirts Project (X-COP)
- Measuring the dynamical state of Planck SZ-selected clusters: X-ray peak - BCG offset
- Shock heating of the merging galaxy cluster A521
- redMaPPer III: A Detailed Comparison of the Planck 2013 and SDSS DR8 RedMaPPer Cluster Catalogs
- Second order Fermi reacceleration mechanisms and large scale synchrotron radio emission in intra-cluster bridges
- A shock in `El Gordo' cluster and the origin of the radio relic
- The extended ROSAT-ESO Flux Limited X-ray Galaxy Cluster Survey (REFLEX II)\\ II. Construction and Properties of the Survey
- First LOFAR observations at very low frequencies of cluster-scale non-thermal emission: the case of Abell 2256
- LOFAR discovery of a double radio halo system in Abell 1758 and radio/X-ray study of the cluster pair
- Wideband VLA Observations of Abell 2256 I: Continuum, Rotation Measure and Spectral Imaging
- Relics in galaxy clusters at high radio frequencies
- Merging Cluster Collaboration: A Panchromatic Atlas of Radio Relic Mergers
- The extended Northern ROSAT Galaxy Cluster Survey (NORAS II) I. Survey Construction and First Results
- Probing the Off-State of Cluster Giant Radio Halos
- New giant radio sources and underluminous radio halos in two galaxy clusters