Radio fossils, relics, and haloes in Abell 3266: cluster archaeology with ASKAP-EMU and the ATCA

Riseley, C. J.; Bonnassieux, E.; Vernstrom, T.; Galvin, T. J.; Chokshi, A.; Botteon, A.; Rajpurohit, K.; Duchesne, S. W.; Bonafede, A.; Rudnick, L.; Hoeft, M.; Quici, B.; Eckert, D.; Brienza, M.; Tasse, C.; Carretti, E.; Collier, J. D.; Diego, J. M.; Di Mascolo, L.; Hopkins, A. M.; Johnston-Hollitt, M.; Keel, R. R.; Koribalski, B. S.; Reiprich, T. H.

doi:10.1093/mnras/stac1771

Title: Radio fossils, relics, and haloes in Abell 3266: cluster archaeology with ASKAP-EMU and the ATCA

Journal Article · 31 July 2022 · Monthly Notices of the Royal Astronomical Society

DOI: https://doi.org/10.1093/mnras/stac1771 · OSTI ID:1879154

; Bonnassieux, E.;

;

; Bonafede, A.;

;

; Quici, B.; Eckert, D.; Brienza, M.; Tasse, C.;

; Collier, J. D.;

; Di Mascolo, L.; Hopkins, A. M. more »

ABSTRACT Abell 3266 is a massive and complex merging galaxy cluster that exhibits significant substructure. We present new, highly sensitive radio continuum observations of Abell 3266 performed with the Australian Square Kilometre Array Pathfinder (0.8–1.1 GHz) and the Australia Telescope Compact Array (1.1–3.1 GHz). These deep observations provide new insights into recently reported diffuse non-thermal phenomena associated with the intracluster medium, including a ‘wrong-way’ relic, a fossil plasma source, and an as-yet unclassified central diffuse ridge, which we reveal comprises the brightest part of a large-scale radio halo detected here for the first time. The ‘wrong-way’ relic is highly atypical of its kind: it exhibits many classical signatures of a shock-related radio relic, while at the same time exhibiting strong spectral steepening. While radio relics are generally consistent with a quasi-stationary shock scenario, the ‘wrong-way’ relic is not. We study the spectral properties of the fossil plasma source; it exhibits an ultrasteep and highly curved radio spectrum, indicating an extremely aged electron population. The larger scale radio halo fills much of the cluster centre, and presents a strong connection between the thermal and non-thermal components of the intracluster medium, along with evidence of substructure. Whether the central diffuse ridge is simply a brighter component of the halo, or a mini-halo, remains an open question. Finally, we study the morphological and spectral properties of the multiple complex radio galaxies in this cluster in unprecedented detail, tracing their evolutionary history.

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Research Organization:: Oak Ridge Institute for Science and Education (ORISE), Oak Ridge, TN (United States)

Sponsoring Organization:: German Research Foundation (DFG); Higher Education Funding Council for England; Ministry of Science and Education of Spain; National Science Foundation (NSF); Science and Technology Facilities Council of the United Kingdom; Texas University; USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: SC0014664

OSTI ID:: 1879154

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 2 Vol. 515; ISSN 0035-8711

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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A newly discovered radio halo in merging cluster MACS J2243.3-0935 Cantwell, T. M.; Scaife, A. M. M.; Oozeer, N. Monthly Notices of the Royal Astronomical Society, Vol. 458, Issue 2 https://doi.org/10.1093/mnras/stw419	journal	February 2016
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LOFAR discovery of an ultra-steep radio halo and giant head–tail radio galaxy in Abell 1132 Wilber, A.; Brüggen, M.; Bonafede, A. Monthly Notices of the Royal Astronomical Society, Vol. 473, Issue 3 https://doi.org/10.1093/mnras/stx2568	journal	October 2017
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Particle re-acceleration and Faraday-complex structures in the RXC J1314.4-2515 galaxy cluster Stuardi, C.; Bonafede, A.; Wittor, D. Monthly Notices of the Royal Astronomical Society https://doi.org/10.1093/mnras/stz2408	journal	August 2019
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The Beautiful Mess in Abell 2255 Botteon, A.; Brunetti, G.; van Weeren, R. J. The Astrophysical Journal, Vol. 897, Issue 1 https://doi.org/10.3847/1538-4357/ab9a2f	journal	July 2020
Discovery of a Radio Relic in the Massive Merging Cluster SPT-CL J2023-5535 from the ASKAP-EMU Pilot Survey HyeongHan, Kim; Jee, M. James; Rudnick, Lawrence The Astrophysical Journal, Vol. 900, Issue 2 https://doi.org/10.3847/1538-4357/aba742	journal	September 2020
VLA Resolves Unexpected Radio Structures in the Perseus Cluster of Galaxies Gendron-Marsolais, M. -L.; Hull, C. L. H.; Perley, R. The Astrophysical Journal, Vol. 911, Issue 1 https://doi.org/10.3847/1538-4357/abddbb	journal	April 2021
Ultra-steep-spectrum Radio “Jellyfish” Uncovered in A2877 Hodgson, Torrance; Bartalucci, Iacopo; Johnston-Hollitt, Melanie The Astrophysical Journal, Vol. 909, Issue 2 https://doi.org/10.3847/1538-4357/abe384	journal	March 2021
Deep Low-frequency Radio Observations of A2256. I. The Filamentary Radio Relic Rajpurohit, K.; van Weeren, R. J.; Hoeft, M. The Astrophysical Journal, Vol. 927, Issue 1 https://doi.org/10.3847/1538-4357/ac4708	journal	March 2022
Dark Energy Survey Year 1 Results: The Photometric Data Set for Cosmology Drlica-Wagner, A.; Sevilla-Noarbe, I.; Rykoff, E. S. The Astrophysical Journal Supplement Series, Vol. 235, Issue 2 https://doi.org/10.3847/1538-4365/aab4f5	journal	April 2018
The Dark Energy Survey Data Release 2 Abbott, T. M. C.; Adamów, M.; Aguena, M. The Astrophysical Journal Supplement Series, Vol. 255, Issue 2 https://doi.org/10.3847/1538-4365/ac00b3	journal	July 2021
Discovery of a Radio Halo (and Relic) in a M ₅₀₀ < 2 × 10 ¹⁴ M _⊙ Cluster Botteon, A.; Cassano, R.; van Weeren, R. J. The Astrophysical Journal Letters, Vol. 914, Issue 2 https://doi.org/10.3847/2041-8213/ac0636	journal	June 2021

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