Ghosh, R and Dutta, A and Sharma, P (2024) Ram pressure stripping in clusters: gravity can bind the ISM but not the CGM. In: Monthly Notices of the Royal Astronomical Society, 531 (3). pp. 3445-3467.
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Abstract
We explore the survival of a galaxy's circumgalactic medium (CGM) as it experiences ram pressure stripping (RPS) moving through the intracluster medium (ICM). For a satellite galaxy, the CGM is often assumed to be entirely stripped/evaporated, an assumption that may not always be justified. We carry out 3D-hydrodynamic simulations of the interstellar and circumgalactic media (ISM + CGM) of a galaxy like JO201 moving through the ICM. The CGM can survive long at cluster outskirts () but at smaller clustercentric distances, 90 per cent of the CGM mass is lost within �500 Myr. The gravitational restoring force on the CGM is mostly negligible and the CGM-ICM interaction is analogous to 'cloud-wind interaction'. The CGM stripping time-scale does not depend on the ram pressure but on the CGM to ICM density contrast �. Two distinct regimes emerge for CGM stripping: the � > 1 regime, which is the well-known 'cloud crushing' problem, and the � < 1 regime, which we refer to as the (relatively unexplored) 'bubble drag' problem. The first pericentric passage near the cluster core can rapidly - over a crossing time tdrag �R/vrel - strip the CGM in the bubble drag regime. The ISM stripping criterion unlike the CGM criterion, still depends on the ram pressure. The stripped tails of satellites contain contributions from both the disc and the CGM. The X-ray plume in M89 in the Virgo cluster and a lack of it in the nearby M90 might be attributed to their orbital histories. M90 has likely undergone stripping in the bubble drag regime due to a pericentric passage close to the cluster centre. © 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.
| Item Type: | Journal Article |
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| Publication: | Monthly Notices of the Royal Astronomical Society |
| Publisher: | Oxford University Press |
| Additional Information: | The copyright for this article belongs to Authors. |
| Keywords: | Galaxies; Gravitation; Numerical methods; Orbits, Galaxies: clusters: intracluster mediums; Galaxies: groups: generals; Galaxy evolution; Galaxy:halo; Hydrodynamic simulation; Method: numerical; Ram-pressure stripping; Restoring forces; Time-scales, Drag |
| Department/Centre: | Division of Physical & Mathematical Sciences > Joint Astronomy Programme Division of Physical & Mathematical Sciences > Physics |
| Date Deposited: | 31 Jul 2024 05:12 |
| Last Modified: | 31 Jul 2024 05:12 |
| URI: | http://eprints.iisc.ac.in/id/eprint/85699 |
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