MERGHERS Pilot: MeerKAT discovery of diffuse emission in nine massive Sunyaev-Zel'dovich-selected galaxy clusters from ACT

Abstract

The MeerKAT Exploration of Relics, Giant Halos, and Extragalactic Radio Sources (MERGHERS) survey is a planned project to study a large statistical sample of galaxy clusters with the MeerKAT observatory. Here we present the results of a 16--hour pilot project, observed in response to the 2019 MeerKAT Shared Risk proposal call, to test the feasibility of using MeerKAT for a large cluster study using short (0.2--2.1\,hour) integration times. The pilot focuses on 1.28\,GHz observations of 13 massive, low-to-intermediate redshift ($0.22<z<0.65$) clusters from the Sunyaev-Zel'dovich-selected Atacama Cosmology Telescope (ACT) DR5 catalogue that show multiwavelength indications of dynamical disturbance. With a 70 per cent detection rate (9/13 clusters), this pilot study validates our proposed MERGHERS observing strategy and provides twelve detections of diffuse emission, eleven of them new, indicating the strength of MeerKAT for such types of studies. The detections (signal-to-noise ratio $\gtrsim 6$) are summarised as follows: two systems host both relic(s) and a giant radio halo, five systems host radio halos, and two have candidate radio halos. Power values, $k$-corrected to 1.4 GHz assuming a fiducial spectral index of $\alpha =-1.3\pm 0.4$, are consistent with known radio halo and relic scaling relations.

9 pages, 4 figures, 2 tables. Accepted to MNRAS

References in corpus (22)

• Array Programming with NumPy
• WSClean: an implementation of a fast, generic wide-field imager for radio astronomy
• Galaxy Clusters Discovered via the Sunyaev-Zel'dovich Effect in the 2500-square-degree SPT-SZ survey
• Diffuse Radio Emission from Galaxy Clusters
• An optimized algorithm for multi-scale wideband deconvolution of radio astronomical images
• The Atacama Cosmology Telescope: A Catalog of > 4000 Sunyaev-Zel'dovich Galaxy Clusters
• Science With The Australian Square Kilometre Array Pathfinder
• Radio interferometric gain calibration as a complex optimization problem
• 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
• The impact of mergers on relaxed X-ray clusters - II. Effects on global X-ray and SZ properties and their scaling relations
• Non-linear Kalman filters for calibration in radio interferometry
• A new double radio relic in PSZ1 G096.89+24.17 and a radio relic mass-luminosity relation
• The Atacama Cosmology Telescope: DR5 maps of 18,000 square degrees of the microwave sky from ACT 2008-2018 data
• Radio halos in a mass-selected sample of 75 galaxy clusters. II. Statistical analysis
• Fast magnetic field amplification in distant galaxyclusters
• The Impact of Galaxy Cluster Mergers on Cosmological Parameter Estimation from Surveys of the Sunyaev-Zel'dovich Effect
• Discovery of a radio relic in the low mass, merging galaxy cluster PLCK G200.9-28.2
• Diffuse Radio Sources in a Statistically Complete Sample of High Redshift Galaxy Clusters
• Diffuse radio emission in MACS J0025.4$-$1222: the effect of a major merger on bulk separation of ICM components
• LOFAR Detection of a Low-Power Radio Halo in the Galaxy Cluster Abell 990
• ASKAP reveals giant radio halos in two merging SPT galaxy clusters -- Making the case for a direction-dependent pipeline --

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• HI intensity mapping with MeerKAT: forecast for delay power spectrum measurement using interferometer mode
• Double radio relics and radio halo in the high redshift galaxy cluster El Gordo with the Upgraded GMRT
• The MeerKAT Galaxy Clusters Legacy Survey: star formation in massive clusters at 0.15 < z < 0.35
• The MeerKAT Massive Distant Clusters Survey: A Radio Halo in a Massive Galaxy Cluster at z = 1.23
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• Atacama Large Aperture Submillimeter Telescope (AtLAST) Science: Resolving the Hot and Ionized Universe through the Sunyaev-Zeldovich effect
• CHEX-MATE: New detections and properties of the radio diffuse emission in massive clusters with MeerKAT
• Exploiting the high-resolution NIKA2 data to study the intracluster medium and dynamical state of ACT-CL J0240.0+0116
• Radio Halo Detection in MWA Data using Deep Neural Networks and Generative Data Augmentation
• A LOFAR-uGMRT spectral index study of distant radio halos
• The MeerKAT Massive Distant Clusters Survey: a search for diffuse radio emission in 30 massive SZ-selected clusters at $z>1$