Tidal Formation of dark matter deficit diffuse galaxy NGC1052-DF2 by SIDM
arxiv(2024)
摘要
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 self-interaction can
give rise to the transformation of a conventional dwarf galaxy into a galaxy
resembling DF2 in all its observed properties. 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 self-interaction. 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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