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ASKAP reveals giant radio halos in two merging SPT galaxy clusters

Published online by Cambridge University Press:  08 October 2020

Amanda G. Wilber
Affiliation:
International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA6102, Australia Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, 21029Hamburg, Germany
Melanie Johnston-Hollitt
Affiliation:
International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA6102, Australia
Stefan W. Duchesne
Affiliation:
International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA6102, Australia
Cyril Tasse
Affiliation:
GEPI, Observatoire de Paris, Universite PSL, CNRS, 5 Place Jules Janssen, 92190Meudon, France
Hiroki Akamatsu
Affiliation:
SRON Netherlands Institute for Space Research, Utrecht, The Netherlands
Huib Intema
Affiliation:
International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA6102, Australia
Torrance Hodgson
Affiliation:
International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA6102, Australia
Corresponding

Abstract

Early science observations from the Australian Square Kilometre Array Pathfinder (ASKAP) have revealed clear signals of diffuse radio emission associated with two clusters detected by the South Pole Telescope via their Sunyaev Zel’dovich signal: SPT CLJ0553-3342 (MACS J0553.4-3342) and SPT CLJ0638-5358 (Abell S0592) are both high-mass lensing clusters that have undergone major mergers. To create science-fidelity images of the galaxy clusters, we performed direction-dependent (DD) calibration and imaging on these ASKAP early science observations using state-of-the-art software killMS and DDFacet. Here, we present our DD calibrated ASKAP radio images of both clusters showing unambiguous giant radio halos with largest linear scales of ${\sim}1$ Mpc. The halo in MACS J0553.4-3342 was previously detected with Giant Metrewave Radio Telescope observations at 323 MHz but appears more extended in our ASKAP image. Although there is a shock detected in the thermal X-ray emission of this cluster, we find that the particle number density in the shocked region is too low to allow for the generation of a radio shock. The radio halo in Abell S0592 is a new discovery, and the Southwest border of the halo coincides with a shock detected in X-rays. We discuss the origins of these halos considering both the hadronic and turbulent re-acceleration models and sources of seed electrons. This work gives a positive indication of the potential of ASKAP’s Evolutionary Map of the Universe survey in detecting intracluster medium radio sources.

Type
Research Article
Copyright
© The Author(s), 2020. Published by Cambridge University Press on behalf of the Astronomical Society of Australia

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ASKAP reveals giant radio halos in two merging SPT galaxy clusters
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