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The effects of self-interacting dark matter on the stripping of galaxies that fall into clusters

Sirks, Ellen L.; Oman, Kyle A.; Robertson, Andrew; Massey, Richard; Frenk, Carlos

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Authors

Profile image of Kyle Oman

Dr Kyle Oman kyle.a.oman@durham.ac.uk
Associate Professor - Royal Society Dorothy Hodgkin Fellow



Abstract

We use the Cluster-EAGLE (C-EAGLE) hydrodynamical simulations to investigate the effects of self-interacting dark matter (SIDM) on galaxies as they fall into clusters. We find that SIDM galaxies follow similar orbits to their cold dark matter (CDM) counterparts, but end up with ∼25 per cent less mass by the present day. One in three SIDM galaxies is entirely disrupted, compared to one in five CDM galaxies. However, the excess stripping will be harder to observe than suggested by previous DM-only simulations because the most stripped galaxies form cores and also lose stars: The most discriminating objects become unobservable. The best test will be to measure the stellar-to-halo mass relation (SHMR) for galaxies with stellar mass 1010−1011M⊙⁠. This is 8 times higher in a cluster than in the field for a CDM universe, but 13 times higher for an SIDM universe. Given intrinsic scatter in the SHMR, these models could be distinguished with noise-free galaxy–galaxy strong lensing of ∼32 cluster galaxies.

Citation

Sirks, E. L., Oman, K. A., Robertson, A., Massey, R., & Frenk, C. (2022). The effects of self-interacting dark matter on the stripping of galaxies that fall into clusters. Monthly Notices of the Royal Astronomical Society, 511(4), 5927-5935. https://doi.org/10.1093/mnras/stac406

Journal Article Type Article
Acceptance Date Feb 7, 2022
Online Publication Date Feb 17, 2022
Publication Date 2022-04
Deposit Date Sep 29, 2021
Publicly Available Date May 26, 2022
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 511
Issue 4
Pages 5927-5935
DOI https://doi.org/10.1093/mnras/stac406
Public URL https://durham-repository.worktribe.com/output/1234724
Related Public URLs https://ui.adsabs.harvard.edu/abs/2021arXiv210903257S

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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
© The Author(s) 2022.
Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative
Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium,
provided the original work is properly cited.






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