The MeerKAT Massive Distant Clusters Survey: detection of diffuse radio emission in galaxy clusters at z > 1: Detection of diffuse radio emission in galaxy clusters at z > 1
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| Název: | The MeerKAT Massive Distant Clusters Survey: detection of diffuse radio emission in galaxy clusters at z > 1: Detection of diffuse radio emission in galaxy clusters at z > 1 |
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| Autoři: | Dakalo G Phuravhathu, M Hilton, S P Sikhosana, Y C Perrott, T Mroczkowski, L Di Mascolo, D Y Klutse, K Knowles, J van Marrewijk, K Moodley, B Partridge, C Sifón, U Sureshkumar, E J Wollack |
| Přispěvatelé: | POTHIER, Nathalie |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 542:1544-1561 |
| Publication Status: | Preprint |
| Informace o vydavateli: | Oxford University Press (OUP), 2025. |
| Rok vydání: | 2025 |
| Témata: | galaxies: clusters: intracluster medium, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Astrophysics of Galaxies, galaxies: clusters: general, X-rays: galaxies: clusters, Astrophysics of Galaxies (astro-ph.GA), radio continuum: general, FOS: Physical sciences, [PHYS.ASTR] Physics [physics]/Astrophysics [astro-ph], Cosmology and Nongalactic Astrophysics |
| Popis: | Diffuse, low surface brightness radio emission in merging galaxy clusters provides insights into cosmic structure formation, the growth of magnetic fields, and turbulence. This paper reports a search for diffuse radio emission in a pilot sample of six high-redshift ($1.01 < z < 1.31$) galaxy clusters from the MeerKAT Massive Distant Clusters Survey (MMDCS). These six clusters are selected as the most massive ($M_{\rm 500c} = 6.7 \!-\! 8.5 \times 10^{14} \, {{\rm M}_{\odot }}$) systems based on their Sunyaev–Zel’dovich mass from the full MMDCS sample of 30 Atacama Cosmology Telescope Data Release 5 clusters, and were observed first to explore the high-mass, high-redshift regime. Diffuse radio emission is confidently detected in four clusters and tentatively identified in two, with k-corrected radio powers scaled to 1.4 GHz ranging from $(0.46 \pm 0.16)$ to $(4.51 \pm 1.68) \times 10^{24}\, \mathrm{WHz^{-1}}$ and linear sizes between 0.47 and 1.08 Mpc. Combining Chandra X-ray data with MeerKAT radio data, we find that 80 per cent of clusters with X-ray observations exhibit disturbed morphologies indicative of mergers. These $z > 1$ galaxy clusters scatter around the established radio power–mass scaling relation observed at lower redshifts, supporting turbulent reacceleration models in high-redshift mergers. However, their radio spectra are predicted to steepen ($\alpha < -1.5$) due to enhanced inverse Compton losses in the cosmic microwave background, rendering them underluminous at 1.4 GHz and placing them below the correlation. Our results demonstrate that merger-driven turbulence can sustain radio haloes even at $z > 1$ while highlighting MeerKAT’s unique ability to probe non-thermal processes in the early Universe. |
| Druh dokumentu: | Article |
| Popis souboru: | application/pdf |
| Jazyk: | English |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/staf1315 |
| DOI: | 10.48550/arxiv.2506.08853 |
| Přístupová URL adresa: | http://arxiv.org/abs/2506.08853 https://research.rug.nl/en/publications/aa1fc8e0-67ed-4fd8-a661-bb36a54b5fc1 https://hdl.handle.net/11370/aa1fc8e0-67ed-4fd8-a661-bb36a54b5fc1 https://doi.org/10.1093/mnras/staf1315 https://hal.science/hal-05162682v1 https://doi.org/10.1093/mnras/staf1315 https://hal.science/hal-05162682v1/document |
| Rights: | CC BY arXiv Non-Exclusive Distribution |
| Přístupové číslo: | edsair.doi.dedup.....9e18fec573479621f6b22882ec13853e |
| Databáze: | OpenAIRE |
Nájsť tento článok vo Web of Science | Abstrakt: | Diffuse, low surface brightness radio emission in merging galaxy clusters provides insights into cosmic structure formation, the growth of magnetic fields, and turbulence. This paper reports a search for diffuse radio emission in a pilot sample of six high-redshift ($1.01 < z < 1.31$) galaxy clusters from the MeerKAT Massive Distant Clusters Survey (MMDCS). These six clusters are selected as the most massive ($M_{\rm 500c} = 6.7 \!-\! 8.5 \times 10^{14} \, {{\rm M}_{\odot }}$) systems based on their Sunyaev–Zel’dovich mass from the full MMDCS sample of 30 Atacama Cosmology Telescope Data Release 5 clusters, and were observed first to explore the high-mass, high-redshift regime. Diffuse radio emission is confidently detected in four clusters and tentatively identified in two, with k-corrected radio powers scaled to 1.4 GHz ranging from $(0.46 \pm 0.16)$ to $(4.51 \pm 1.68) \times 10^{24}\, \mathrm{WHz^{-1}}$ and linear sizes between 0.47 and 1.08 Mpc. Combining Chandra X-ray data with MeerKAT radio data, we find that 80 per cent of clusters with X-ray observations exhibit disturbed morphologies indicative of mergers. These $z > 1$ galaxy clusters scatter around the established radio power–mass scaling relation observed at lower redshifts, supporting turbulent reacceleration models in high-redshift mergers. However, their radio spectra are predicted to steepen ($\alpha < -1.5$) due to enhanced inverse Compton losses in the cosmic microwave background, rendering them underluminous at 1.4 GHz and placing them below the correlation. Our results demonstrate that merger-driven turbulence can sustain radio haloes even at $z > 1$ while highlighting MeerKAT’s unique ability to probe non-thermal processes in the early Universe. |
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| ISSN: | 13652966 00358711 |
| DOI: | 10.1093/mnras/staf1315 |