Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 461, Issue 1, Pages 412-432Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stw1283
Keywords
galaxies: clusters: general; galaxies: clusters: intracluster medium
Categories
Funding
- ISF [124/12]
- I-CORE Program of the PBC/ISF [1829/12]
- BSF [2014-273]
- NSF [AST-1405962]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1412768, 1412107] Funding Source: National Science Foundation
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We utilize cosmological simulations of 16 galaxy clusters at redshifts z = 0 and z = 0.6 to study the effect of inflowing streams on the properties of the X-ray emitting intracluster medium. We find that the mass accretion occurs predominantly along streams that originate from the cosmic web and consist of heated gas. Clusters that are unrelaxed in terms of their X-ray morphology are characterized by higher mass inflow rates and deeper penetration of the streams, typically into the inner third of the virial radius. The penetrating streams generate elevated random motions, bulk flows and cold fronts. The degree of penetration of the streams may change over time such that clusters can switch from being unrelaxed to relaxed over a time-scale of several giga years.
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