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arXiv · 2205.02957

Gravothermal solutions of SIDM halos: mapping from constant to velocity-dependent cross section

Shengqi Yang·Xiaolong Du·Zhichao Carton Zeng·Andrew Benson·Fangzhou Jiang·Ethan O. Nadler·Annika H. G. Peter
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Abstract

The scale-free gravothermal fluid formalism has long proved effective in describing the evolution of self-interacting dark matter halos with a constant dark matter particle cross section. However, whether the gravothermal fluid solutions match numerical simulations for velocity-dependent cross-section scenarios remains untested. In this work, we provide a fast mapping method that relates the constant-cross-section gravothermal solution to models with arbitrary velocity dependence in the cross section. We show that the gravothermal solutions after mapping are in good agreement with Arepo N-Body simulation results. We illustrate the power of this approach by applying this fast mapping method to a halo hosting a low surface brightness galaxy UGC 128. We show that this fast mapping method can be used to constrain free parameters in a physically motivated cross-section model and illustrate parameter space favored by the rotation curve measurement.

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Shengqi Yang, Xiaolong Du, Zhichao Carton Zeng, Andrew Benson, Fangzhou Jiang, Ethan O. Nadler, Annika H. G. Peter. 2023-03-02. Gravothermal solutions of SIDM halos: mapping from constant to velocity-dependent cross section. https://doi.org/10.3847/1538-4357%2Facbd49

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