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arXiv · 2403.11403

Tidal Formation of dark matter deficit diffuse galaxy NGC1052-DF2 by SIDM

Zhao-Chen Zhang·Xiao-Jun Bi·Peng-Fei Yin
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Abstract

Observations have revealed a significant dark matter deficit in the ultra-diffuse galaxy NGC1052-DF2 (DF2). It is widely accepted that the formation of this unique galaxy can be attributed to the tidal stripping of its host galaxy, NGC1052. In this study, we simulate the evolution of a satellite system containing globular clusters (GCs) within an accreting host halo in the framework of self-interacting dark matter (SIDM). Our simulation results suggest that the heightened tidal stripping resulting from DM self-interactions can give rise to the transformation of a conventional dwarf galaxy into a dark matter deficit galaxy resembling DF2. By comparing the simulation results with identical initial conditions in both the standard cold dark matter (CDM) and SIDM models, we find that the latter is more likely to replicate the properties of DF2. Furthermore, we demonstrate that a DF2 analog can also be produced on an orbit with a greater pericenter distance by increasing the strength of DM self-interactions. This suggests that the issue of extreme orbital parameters can be mitigated by implementing the SIDM model. The distributions of the GC population derived in our SIDM simulation are consistent with the observed characteristics of DF2. For comparison, we also explored the potential for achieving GC distributions in the context of CDM.

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Zhao-Chen Zhang, Xiao-Jun Bi, Peng-Fei Yin. 2024-08-07. Tidal Formation of dark matter deficit diffuse galaxy NGC1052-DF2 by SIDM. https://arxiv.org/abs/2403.11403

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