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TheThreeHundred Project: ram pressure and gas content of haloes and subhaloes in the phase-space plane

Arthur, Jake; Pearce, Frazer R.; Gray, Meghan E.; Knebe, Alexander; Cui, Weiguang; Elahi, Pascal J.; Power, Chris; Yepes, Gustavo; Arth, Alexander; De Petris, Marco; Dolag, Klaus; Garratt-Smithson, Lilian; Old, Lyndsay J.; Rasia, Elena; Stevens, Adam R H

TheThreeHundred Project: ram pressure and gas content of haloes and subhaloes in the phase-space plane Thumbnail


Jake Arthur

Professor of Astronomy

Alexander Knebe

Weiguang Cui

Pascal J. Elahi

Chris Power

Gustavo Yepes

Alexander Arth

Marco De Petris

Klaus Dolag

Lilian Garratt-Smithson

Lyndsay J. Old

Elena Rasia

Adam R H Stevens


We use THETHREEHUNDRED project, a suite of 324 resimulated massive galaxy clusters embedded in a broad range of environments, to investigate (i) how the gas content of the surrounding haloes correlates with the phase-space position at z z = 0 and (ii) the role that ram pressure plays in this correlation. By stacking all 324 normalized phase-space planes containing 169 287 haloes and subhaloes, we show that the halo gas content is tightly correlated with the phase-space position. At ∼1.5--2R 200 ∼1.5--2R200 of the cluster dark matter halo, we find an extremely steep decline in the halo gas content of infalling haloes and subhaloes irrespective of cluster mass, possibly indicating the presence of an accretion shock. We also find that subhaloes are particularly gas-poor, even in the cluster outskirts, which could indicate active regions of ongoing pre-processing. By modelling the instantaneous ram pressure experienced by each halo and subhalo at z z = 0, we show that the ram pressure intensity is also well correlated with the phase-space position, which is again irrespective of cluster mass. In fact, we show that regions in the phase-space plane with high differential velocity between a halo or subhalo and its local gas environment are almost mutually exclusive with high halo gas content regions. This suggests a causal link between the gas content of objects and the instantaneous ram pressure they experience, where the dominant factor is the differential velocity.

Journal Article Type Article
Acceptance Date Jan 19, 2019
Online Publication Date Jan 21, 2019
Publication Date Apr 11, 2019
Deposit Date Mar 15, 2019
Publicly Available Date Mar 15, 2019
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 484
Issue 3
Pages 3968-3983
Keywords Galaxies; Clusters; Dark matter
Public URL
Publisher URL
Additional Information This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society©: 2019 The authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.


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