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research article

Is ram-pressure stripping an efficient mechanism to remove gas in galaxies?

Quilis, Vicent
•
Planelles, Susana
•
Ricciardelli, Elena  
2017
Monthly Notices Of The Royal Astronomical Society

We study how the gas in a sample of galaxies (M-* > 10(9) M-circle dot) in clusters, obtained in a cosmological simulation, is affected by the interaction with the intracluster medium (ICM). The dynamical state of each elemental parcel of gas is studied using the total energy. At z similar to 2, the galaxies in the simulation are evenly distributed within clusters, later moving towards more central locations. In this process, gas from the ICM is accreted and mixed with the gas in the galactic halo. Simultaneously, the interaction with the environment removes part of the gas. A characteristic stellar mass around M-* > 10(10) M-circle dot appears as a threshold marking two differentiated behaviours. Below this mass, galaxies are located at the external part of clusters and have eccentric orbits. The effect of the interaction with the environment is marginal. Above, galaxies are mainly located at the inner part of clusters with mostly radial orbits with low velocities. In these massive systems, part of the gas, strongly correlated with the stellar mass of the galaxy, is removed. The amount of removed gas is subdominant compared with the quantity of retained gas, which is continuously influenced by the hot gas coming from the ICM. The analysis of individual galaxies reveals the existence of a complex pattern of flows, turbulence and a constant fuelling of gas to the hot corona from the ICM, which could mean that the global effect of the interaction of galaxies with their environment is substantially less dramatic than previously expected.

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Type
research article
DOI
10.1093/mnras/stx770
Web of Science ID

WOS:000402825000005

Author(s)
Quilis, Vicent
Planelles, Susana
Ricciardelli, Elena  
Date Issued

2017

Publisher

Oxford Univ Press

Published in
Monthly Notices Of The Royal Astronomical Society
Volume

469

Issue

1

Start page

80

End page

94

Subjects

methods: numerical

•

galaxies: clusters: intracluster medium

•

galaxies: evolution

•

galaxies: haloes

•

galaxies: interactions

•

galaxies: ISM

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LASTRO  
Available on Infoscience
July 10, 2017
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/138940
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