Discovery of a radio relic in the massive merging cluster SPT-CL J2023-5535 from the ASKAP-EMU Pilot Survey

Kim HyeongHan; M. James Jee; Lawrence Rudnick; David Parkinson; Kyle Finner; Mijin Yoon; Wonki Lee; Gianfranco Brunetti; Marcus Brüggen; Jordan D. Collier; Andrew M. Hopkins; Michał J. Michałowski; Ray P. Norris; Chris Riseley

doi:10.3847/1538-4357/aba742

Discovery of a radio relic in the massive merging cluster SPT-CL J2023-5535 from the ASKAP-EMU Pilot Survey

Kim HyeongHan, M. James Jee, Lawrence Rudnick, David Parkinson, Kyle Finner, Mijin Yoon, Wonki Lee, Gianfranco Brunetti, Marcus Brüggen, Jordan D. Collier, Andrew M. Hopkins, Michał J. Michałowski, Ray P. Norris, Chris Riseley

Australian Astronomical Optics

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Abstract

The ASKAP-EMU survey is a deep wide-field radio continuum survey designed to cover the entire southern sky and a significant fraction of the northern sky up to +30°. Here, we report a discovery of a radio relic in the merging cluster SPT-CL J2023-5535 at z = 0.23 from the ASKAP-EMU pilot 300 square degree survey (800-1088 MHz). The deep high-resolution data reveal a ∼2 Mpc scale radio halo elongated in the east-west direction, coincident with the intracluster gas. The radio relic is located at the western edge of this radio halo stretched ∼0.5 Mpc in the north-south orientation. The integrated spectral index of the radio relic within the narrow bandwidth is α800MHz1088MHz = -0.76 ± 0.06. Our weak-lensing analysis shows that the system is massive (M200 = 1.04 ± 0.36 × 1015 M⊙) and composed of at least three subclusters. We suggest a scenario, wherein the radio features arise from the collision between the eastern and middle subclusters. Our discovery illustrates the effectiveness of the ASKAP-EMU survey in detecting diffuse emissions in galaxy clusters and when completed, the survey will greatly increase the number of merging cluster detections with diffuse radio emissions.

Original language	English
Article number	127
Pages (from-to)	1-7
Number of pages	7
Journal	Astrophysical Journal
Volume	900
Issue number	2
DOIs	https://doi.org/10.3847/1538-4357/aba742
Publication status	Published - 10 Sept 2020

Bibliographical note

Copyright 2020 The American Astronomical Society. First published in the Astrophysical Journal, 900(2), 127, 2020, published by IOP Publishing. The original publication is available at https://doi.org/10.3847/1538-4357/aba742. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

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HyeongHan, K., Jee, M. J., Rudnick, L., Parkinson, D., Finner, K., Yoon, M., Lee, W., Brunetti, G., Brüggen, M., Collier, J. D., Hopkins, A. M., Michałowski, M. J., Norris, R. P., & Riseley, C. (2020). Discovery of a radio relic in the massive merging cluster SPT-CL J2023-5535 from the ASKAP-EMU Pilot Survey. Astrophysical Journal, 900(2), 1-7. [127]. https://doi.org/10.3847/1538-4357/aba742

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title = "Discovery of a radio relic in the massive merging cluster SPT-CL J2023-5535 from the ASKAP-EMU Pilot Survey",

abstract = "The ASKAP-EMU survey is a deep wide-field radio continuum survey designed to cover the entire southern sky and a significant fraction of the northern sky up to +30°. Here, we report a discovery of a radio relic in the merging cluster SPT-CL J2023-5535 at z = 0.23 from the ASKAP-EMU pilot 300 square degree survey (800-1088 MHz). The deep high-resolution data reveal a ∼2 Mpc scale radio halo elongated in the east-west direction, coincident with the intracluster gas. The radio relic is located at the western edge of this radio halo stretched ∼0.5 Mpc in the north-south orientation. The integrated spectral index of the radio relic within the narrow bandwidth is α800MHz1088MHz = -0.76 ± 0.06. Our weak-lensing analysis shows that the system is massive (M200 = 1.04 ± 0.36 × 1015 M⊙) and composed of at least three subclusters. We suggest a scenario, wherein the radio features arise from the collision between the eastern and middle subclusters. Our discovery illustrates the effectiveness of the ASKAP-EMU survey in detecting diffuse emissions in galaxy clusters and when completed, the survey will greatly increase the number of merging cluster detections with diffuse radio emissions.",

author = "Kim HyeongHan and Jee, {M. James} and Lawrence Rudnick and David Parkinson and Kyle Finner and Mijin Yoon and Wonki Lee and Gianfranco Brunetti and Marcus Br{\"u}ggen and Collier, {Jordan D.} and Hopkins, {Andrew M.} and Micha{\l}owski, {Micha{\l} J.} and Norris, {Ray P.} and Chris Riseley",

note = "Copyright 2020 The American Astronomical Society. First published in the Astrophysical Journal, 900(2), 127, 2020, published by IOP Publishing. The original publication is available at https://doi.org/10.3847/1538-4357/aba742. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.",

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HyeongHan, K, Jee, MJ, Rudnick, L, Parkinson, D, Finner, K, Yoon, M, Lee, W, Brunetti, G, Brüggen, M, Collier, JD, Hopkins, AM, Michałowski, MJ, Norris, RP & Riseley, C 2020, 'Discovery of a radio relic in the massive merging cluster SPT-CL J2023-5535 from the ASKAP-EMU Pilot Survey', Astrophysical Journal, vol. 900, no. 2, 127, pp. 1-7. https://doi.org/10.3847/1538-4357/aba742

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T1 - Discovery of a radio relic in the massive merging cluster SPT-CL J2023-5535 from the ASKAP-EMU Pilot Survey

AU - HyeongHan, Kim

AU - Jee, M. James

AU - Rudnick, Lawrence

AU - Parkinson, David

AU - Finner, Kyle

AU - Yoon, Mijin

AU - Lee, Wonki

AU - Brunetti, Gianfranco

AU - Brüggen, Marcus

AU - Collier, Jordan D.

AU - Hopkins, Andrew M.

AU - Michałowski, Michał J.

AU - Norris, Ray P.

AU - Riseley, Chris

N1 - Copyright 2020 The American Astronomical Society. First published in the Astrophysical Journal, 900(2), 127, 2020, published by IOP Publishing. The original publication is available at https://doi.org/10.3847/1538-4357/aba742. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

PY - 2020/9/10

Y1 - 2020/9/10

N2 - The ASKAP-EMU survey is a deep wide-field radio continuum survey designed to cover the entire southern sky and a significant fraction of the northern sky up to +30°. Here, we report a discovery of a radio relic in the merging cluster SPT-CL J2023-5535 at z = 0.23 from the ASKAP-EMU pilot 300 square degree survey (800-1088 MHz). The deep high-resolution data reveal a ∼2 Mpc scale radio halo elongated in the east-west direction, coincident with the intracluster gas. The radio relic is located at the western edge of this radio halo stretched ∼0.5 Mpc in the north-south orientation. The integrated spectral index of the radio relic within the narrow bandwidth is α800MHz1088MHz = -0.76 ± 0.06. Our weak-lensing analysis shows that the system is massive (M200 = 1.04 ± 0.36 × 1015 M⊙) and composed of at least three subclusters. We suggest a scenario, wherein the radio features arise from the collision between the eastern and middle subclusters. Our discovery illustrates the effectiveness of the ASKAP-EMU survey in detecting diffuse emissions in galaxy clusters and when completed, the survey will greatly increase the number of merging cluster detections with diffuse radio emissions.

AB - The ASKAP-EMU survey is a deep wide-field radio continuum survey designed to cover the entire southern sky and a significant fraction of the northern sky up to +30°. Here, we report a discovery of a radio relic in the merging cluster SPT-CL J2023-5535 at z = 0.23 from the ASKAP-EMU pilot 300 square degree survey (800-1088 MHz). The deep high-resolution data reveal a ∼2 Mpc scale radio halo elongated in the east-west direction, coincident with the intracluster gas. The radio relic is located at the western edge of this radio halo stretched ∼0.5 Mpc in the north-south orientation. The integrated spectral index of the radio relic within the narrow bandwidth is α800MHz1088MHz = -0.76 ± 0.06. Our weak-lensing analysis shows that the system is massive (M200 = 1.04 ± 0.36 × 1015 M⊙) and composed of at least three subclusters. We suggest a scenario, wherein the radio features arise from the collision between the eastern and middle subclusters. Our discovery illustrates the effectiveness of the ASKAP-EMU survey in detecting diffuse emissions in galaxy clusters and when completed, the survey will greatly increase the number of merging cluster detections with diffuse radio emissions.

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ER -

Discovery of a radio relic in the massive merging cluster SPT-CL J2023-5535 from the ASKAP-EMU Pilot Survey

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