The Signatures of Self-interacting Dark Matter and Subhalo Disruption on Cluster Substructure

Author:

Bhattacharyya SouradipORCID,Adhikari SusmitaORCID,Banerjee ArkaORCID,More SurhudORCID,Kumar Amit,Nadler Ethan O.ORCID,Chatterjee SuchetanaORCID

Abstract

Abstract The abundance, distribution, and inner structure of satellites of galaxy clusters can be sensitive probes of the properties of dark matter. We run 30 cosmological zoom-in simulations with self-interacting dark matter (SIDM), with a velocity-dependent cross section, to study the properties of subhalos within cluster-mass hosts. We find that the abundance of subhalos that survive in the SIDM simulations are suppressed relative to their cold dark matter (CDM) counterparts. Once the population of disrupted subhalos—which may host orphan galaxies—is taken into account, satellite galaxy populations in CDM and SIDM models can be reconciled. However, even in this case, the inner structures of subhalos are significantly different in the two dark matter models. We study the feasibility of using the weak-lensing signal from the subhalo density profiles to distinguish between the cold and self-interacting dark matter while accounting for the potential contribution of orphan galaxies. We find that the effects of self-interactions on the density profile of subhalos can appear degenerate with subhalo disruption in CDM, when orphans are accounted for. With current error bars from the Subaru Hyper Suprime-Cam Strategic Program, we find that subhalos in the outskirts of clusters (where disruption is less prevalent) can be used to constrain dark matter physics. In the future, the Vera C. Rubin Observatory Legacy Survey of Space and Time will give precise measurements of the weak-lensing profile and can be used to constrain σ T /m at the ∼1 cm2 g−1 level at v ∼ 2000 km s−1.

Publisher

American Astronomical Society

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 15 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. symfind : Addressing the Fragility of Subhalo Finders and Revealing the Durability of Subhalos;The Astrophysical Journal;2024-07-30

2. Overabundance of orphan galaxies in the UniverseMachine empirical galaxy formation model;Monthly Notices of the Royal Astronomical Society: Letters;2024-03-29

3. The abundance of core-collapsed subhaloes in SIDM: insights from structure formation in ΛCDM;Monthly Notices of the Royal Astronomical Society;2024-03-22

4. Cosmological and idealized simulations of dark matter haloes with velocity-dependent, rare and frequent self-interactions;Monthly Notices of the Royal Astronomical Society;2024-03-08

5. The Three Hundred: Msub–Vcirc relation;Monthly Notices of the Royal Astronomical Society;2024-01-31

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