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MERGHERS pilot: MeerKAT discovery of diffuse emission in nine massive Sunyaev–Zel’dovich-selected galaxy clusters from ACT

Knowles, K. and Pillay, D. S. and Amodeo, S. and Baker, A. J. and Basu, K. and Crichton, D. and de Gasperin, F. and Devlin, M. and Ferrari, C. and Hilton, M. and Huffenberger, K. M. and Hughes, J. P. and Koopman, B. J. and Moodley, K. and Mroczkowski, T. and Naess, S. and Nati, F. and Newburgh, L. B. and Oozeer, N. and Page, L. and Partridge, B. and Pfrommer, C. and Salatino, M. and Schillaci, A. and Sifón, C. and Smirnov, O. and Sikhosana, S. P. and Wollack, E. J. and Xu, Z. (2021) MERGHERS pilot: MeerKAT discovery of diffuse emission in nine massive Sunyaev–Zel’dovich-selected galaxy clusters from ACT. Monthly Notices of the Royal Astronomical Society, 504 (2). pp. 1749-1758. ISSN 0035-8711. doi:10.1093/mnras/stab939.

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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-h 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 h) 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 ≳ 6) are summarized as follows: two systems host both relic(s) and a giant radio halo, five systems host radio haloes, and two have candidate radio haloes. Power values, k-corrected to 1.4 GHz, assuming a fiducial spectral index of α = −1.3 ± 0.4, are consistent with known radio halo and relic scaling relations.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Knowles, K.0000-0002-8452-0825
de Gasperin, F.0000-0003-4439-2627
Huffenberger, K. M.0000-0001-7109-0099
Oozeer, N.0000-0002-0155-6321
Pfrommer, C.0000-0002-7275-3998
Schillaci, A.0000-0002-0512-1042
Sifón, C.0000-0002-8149-1352
Xu, Z.0000-0001-5112-2567
Additional Information:© 2021 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model ( Accepted 2021 March 27. Received 2021 March 23; in original form 2020 December 30. Published: 05 April 2021. The MeerKAT telescope is operated by the South African Radio Astronomy Observatory (SARAO), which is a facility of the National Research Foundation, an agency of the Department of Science and Innovation. KK, DP, and SS acknowledge funding support from SARAO. JPH acknowledges support from National Science Foundation Astronomy and Astrophysics Research Program award number 1615657. MH and KM acknowledge support from the National Research Foundation of South Africa. CP acknowledges support by the European Research Council under ERC-CoG grant CRAGSMAN-646955. CS acknowledges support from the Agencia Nacional de Investigación y Desarrollo (ANID) through FONDECYT Iniciación grant no. 11191125. The research of OS is supported by the South African Research Chairs Initiative of the Department of Science and Technology and National Research Foundation. ZX is supported by the Gordon and Betty Moore Foundation. This research made use of the ASTROPY,13 (Astropy Collaboration et al. 2013, 2018), NUMPY (Harris et al. 2020), and SCIPY (Virtanen et al. 2020) PYTHON packages. ASTROPY is a community-developed core PYTHON package for astronomy. The Common Astronomy Software Applications (CASA) package is developed by an international consortium of scientists based at the National Radio Astronomical Observatory (NRAO), the European Southern Observatory (ESO), the National Astronomical Observatory of Japan (NAOJ), the Academia Sinica Institute of Astronomy and Astrophysics (ASIAA), the CSIRO division for Astronomy and Space Science (CASS), and the Netherlands Institute for Radio Astronomy (ASTRON) under the guidance of NRAO. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. Data Availability: The data underlying this paper will be shared on reasonable request to the corresponding author.
Funding AgencyGrant Number
South African Radio Astronomy Observatory (SARAO)UNSPECIFIED
National Research Foundation (South Africa)UNSPECIFIED
European Research Council (ERC)CRAGSMAN-646955
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)11191125
Department of Science and Technology (South Africa)UNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Subject Keywords:galaxies: clusters: general – radio continuum: general
Issue or Number:2
Record Number:CaltechAUTHORS:20210729-161843549
Persistent URL:
Official Citation:K Knowles, D S Pillay, S Amodeo, A J Baker, K Basu, D Crichton, F de Gasperin, M Devlin, C Ferrari, M Hilton, K M Huffenberger, J P Hughes, B J Koopman, K Moodley, T Mroczkowski, S Naess, F Nati, L B Newburgh, N Oozeer, L Page, B Partridge, C Pfrommer, M Salatino, A Schillaci, C Sifón, O Smirnov, S P Sikhosana, E J Wollack, Z Xu, MERGHERS pilot: MeerKAT discovery of diffuse emission in nine massive Sunyaev–Zel’dovich-selected galaxy clusters from ACT, Monthly Notices of the Royal Astronomical Society, Volume 504, Issue 2, June 2021, Pages 1749–1758,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:110065
Deposited By: Tony Diaz
Deposited On:02 Aug 2021 19:17
Last Modified:02 Aug 2021 19:17

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