期刊
ASTROPHYSICAL JOURNAL
卷 833, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/833/2/227
关键词
cosmology: theory; galaxies: clusters: general; galaxies: clusters: intracluster medium; methods: numerical; X-rays: galaxies: clusters
资金
- NSF [AST-1412768]
- NASA ATP grant [NNX11AE07G]
- NASA Chandra Theory grant [GO213004B]
- Research Corporation
- Fisk-Vanderbilt Dissertation Completion Award
- Enrico Fermi Institute at the University of Chicago
- University of Chicago Provost's Office
- Kavli Institute for Cosmological Physics at the University of Chicago [NSF PHY-1125897]
- Kavli Foundation
- Direct For Mathematical & Physical Scien
- Division Of Physics [1125897] Funding Source: National Science Foundation
- NASA [NNX11AE07G, 148024] Funding Source: Federal RePORTER
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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