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Stirred, not Clumped: Evolution of Temperature Profiles in the Outskirts of Galaxy Clusters

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arxiv 1605.01723 v2 pith:5LQ3OCYS submitted 2016-05-05 astro-ph.CO

classification astro-ph.CO
keywords clustersevolutiongalaxyoutskirtstemperaturecosmologicalmotionsnon-thermal
verification ladder T0 review T1 audit T2 compute T3 formal
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Recent statistical X-ray measurements of the intracluster medium (ICM) indicate that gas temperature profiles in the outskirts of galaxy clusters deviate from self-similar evolution. Using a mass-limited sample of galaxy clusters from cosmological hydrodynamical simulations, we show that the departure from self-similarity can be explained by non-thermal gas motions driven by mergers and accretion. Contrary to previous claims, gaseous substructures only play a minor role in the temperature evolution in cluster outskirts. A careful choice of halo overdensity definition in self-similar scaling mitigates these departures. Our work highlights the importance of non-thermal gas motions in ICM evolution and the use of galaxy clusters as cosmological probes.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. The Treble Clef radio phoenix and its old nonthermal filaments

    astro-ph.CO 2026-07 accept novelty 6.5 of 10

    VLSS J0318.9+5755 (the Treble Clef) is a radio phoenix with ultra-steep spectrum in a massive merging cluster at z≈0.117 in the Zone of Avoidance, shaped by ICM gas motions that may also power a candidate radio halo.

  2. The topology of the magnetic field in Abell 2255 out to its virial radius. Results from the LOFAR Galaxy Cluster Ultra-Deep Field

    astro-ph.CO 2026-07 conditional novelty 6.0 of 10

    The magnetic field in Abell 2255 shows ordered, region-dependent orientations inferred from synchrotron intensity gradients, with radial fields in bridges and tangential fields in relics.

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