1. Abell 746: A Highly Disturbed Cluster Undergoing Multiple Mergers
- Author
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K. Rajpurohit, L. Lovisari, A. Botteon, C. Jones, W. Forman, E. O’Sullivan, R. J. van Weeren, K. HyeongHan, A. Bonafede, M. J. Jee, F. Vazza, G. Brunetti, H. Cho, P. Domínguez-Fernández, A. Stroe, K. Finner, M. Brüggen, J. M. Vrtilek, L. P. David, G. Schellenberger, D. Wittman, G. Lusetti, R. Kraft, and F. De Gasperin more...
- Subjects
Galaxy clusters ,Radio continuum emission ,Intracluster medium ,Large-scale structure of the universe ,Astrophysics ,QB460-466 - Abstract
We present deep XMM-Newton, Karl G. Jansky Very Large Array, and upgraded Giant Metrewave Radio Telescope observations of Abell 746, a cluster that hosts a plethora of diffuse emission sources that provide evidence for the acceleration of relativistic particles. Our new XMM-Newton images reveal a complex morphology of the thermal gas with several substructures. We observe an asymmetric temperature distribution across the cluster: the southern regions exhibit higher temperatures, reaching ∼9 keV, while the northern regions have lower temperatures (≤4 keV), likely due to a complex merger. We find evidence of three surface brightness edges and one candidate edge, of which three are merger-driven shock fronts. Combining our new data with published LOw-Frequency ARray observations has unveiled the nature of diffuse sources in this system. The bright NW relic shows thin filaments and a high degree of polarization with aligned magnetic field vectors. We detect a density jump, aligned with the fainter relic to the north. To the south, we detect high-temperature regions, consistent with the shock-heated regions and a density jump coincident with the northern tip of the southern radio structure. Its integrated spectrum shows a high-frequency steepening. Lastly, we find that the cluster hosts large-scale radio halo emission. A comparison of the thermal and nonthermal emission reveals an anticorrelation between the bright radio and X-ray features at the center. Our findings suggest that Abell 746 is a complex system that involves multiple mergers. more...
- Published
- 2024
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