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Cited by 17Galaxies: Formation, Evolution, PhenomenaDark Matter and Cosmic PhenomenaCosmology and Gravitation Theories

The role of baryons in self-interacting dark matter mergers

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Fischer, Moritz S, Durke, Nils-Henrik, Hollingshausen, Katharina, Hammer, Claudius, Brüggen, Marcus, Dolag, Klaus·2023·Monthly Notices of the Royal Astronomical Society
DOI 10.1093/mnras/stad1786
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Abstract

Mergers of galaxy clusters are promising probes of dark matter (DM) physics. For example, an offset between the DM component and the galaxy distribution can constrain DM self-interactions. We investigate the role of the intracluster medium (ICM) and its influence on DM–galaxy offsets in self-interacting dark matter models. To this end, we employ Smoothed Particle Hydrodynamics + N-body simulations to study idealized setups of equal- and unequal-mass mergers with head-on collisions. Our simulations show that the ICM hardly affects the offsets arising shortly after the first pericentre passage compared to DM-only simulations. But later on, e.g. at the first apocentre, the offsets can be amplified by the presence of the ICM. Furthermore, we find that cross-sections small enough not to be excluded by measurements of the core sizes of relaxed galaxy clusters have a chance to produce observable offsets. We found that different DM models affect the DM distribution and also the galaxy and ICM distribution, including its temperature. Potentially, the position of the shock fronts, combined with the brightest cluster galaxies, provides further clues to the properties of DM. Overall our results demonstrate that mergers of galaxy clusters at stages about the first apocentre passage could be more interesting in terms of DM physics than those shortly after the first pericentre passage. This may motivate further studies of mergers at later evolutionary stages.

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  • M. S. Fischer et al. (2023) noted that combining shock-front positions with galaxy/brightest cluster galaxy positions holds promise as a probe of dark matter physics, but concluded that a more detailed theoretical study would be needed before it could be turned into a quantitative constraint.

    “M. S. Fischer et al. (2023) subsequently noted that combining shock-front positions with galaxy/brightest cluster galaxy positions holds promise as a probe of dark matter physics, but concluded that a more detailed theoretical study would be needed before it could be turned into a quantitative constraint.”

    From A New Robust Constraint on the Self-interaction Cross Section of Dark Matter with Double Radio Relic Clusters (2026) · cites this paper as M. S. Fischer et al. (2023)

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Cited by

Sorted by citations

Authors
Fischer, M. S., Durke, N.-H., Hollingshausen, K., Hammer, C., Brüggen, M., & Dolag, K.
Affiliations
  • Universität Hamburg (DE)
  • German Cancer Research Center (DE)
  • Max Planck Institute for Astrophysics (DE)
Corresponding author
Fischer, Moritz S
ORCID
Venue
Monthly Notices of the Royal Astronomical Society
Publisher
Oxford University Press (OUP)
Published
2023-06-14
Volume
523
Issue
4
Pages
5915-5933
ISSN
  • 0035-8711 (ISSN-L)
  • 1365-2966
DOI
10.1093/mnras/stad1786
OpenAlex
W4380589254
Cited by
17
References
1
Citations by year
2026: 4 · 2025: 6 · 2024: 6 · 2023: 1
FWCI
1.87
Type
journal article
Language
en
Open access
Licence
Locations
  • Monthly Notices of the Royal Astronomical Society (publishedVersion)
  • arXiv (Cornell University) (submittedVersion, cc-by)
  • GoeScholar The Publication Server of the Georg-August-Universität Göttingen (Georg-August-Universität Göttingen) (submittedVersion, cc-by)
  • arXiv (Cornell University) (cc-by)
Funders
  • Deutsche Forschungsgemeinschaft
  • European Research Council
  • Horizon 2020 (ERC-2019-AdG 882679)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
  • Physical Sciences › Physics and Astronomy › Nuclear and High Energy Physics › Dark Matter and Cosmic Phenomena
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Cosmology and Gravitation Theories
Keywords
self-interacting dark matter, cluster mergers, intracluster medium, head-on collisions, shock front, brightest cluster galaxies, dark matter cross section

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