Abell 746: A Highly Disturbed Cluster Undergoing Multiple Mergers
Journal
Date Issued
2024
Author(s)
Rajpurohit, K.
•
•
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Jones, C.
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Forman, W.
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O'Sullivan, E.
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van Weeren, R. J.
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HyeongHan, K.
•
•
Jee, M. J.
•
•
•
Cho, H.
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Domínguez-Fernández, P.
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Stroe, A.
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Finner, K.
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Brüggen, M.
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Vrtilek, J. M.
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David, L. P.
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Schellenberger, G.
•
Wittman, D.
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Lusetti, G.
•
Kraft, R.
•
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....
Volume
966
Issue
1
Start page
38
Issn Identifier
0004-637X
Rights
open.access
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