The GD-1 stellar stream perturber as a core-collapsed self-interacting dark matter halo

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Main Authors: Zhang, Xingyu, Yu, Hai-Bo, Yang, Daneng, Nadler, Ethan O.
Format: Preprint
Published: 2024
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_version_ 1866917880679890944
author Zhang, Xingyu
Yu, Hai-Bo
Yang, Daneng
Nadler, Ethan O.
author_facet Zhang, Xingyu
Yu, Hai-Bo
Yang, Daneng
Nadler, Ethan O.
contents The GD-1 stellar stream exhibits spur and gap structures that may result from a close encounter with a dense substructure. When interpreted as a dark matter subhalo, the perturber is denser than predicted in the standard cold dark matter (CDM) model. In self-interacting dark matter (SIDM), however, a halo could evolve into a phase of gravothermal collapse, resulting in a higher central density than its CDM counterpart. We conduct high-resolution controlled N-body simulations to show that a collapsed SIDM halo could account for the GD-1 perturber's high density. We model a progenitor halo with a mass of $3\times10^8~M_\odot$, motivated by a cosmological simulation of a Milky Way analog, and evolve it in the Milky Way's tidal field. For a cross section per mass of $σ/m\approx30-100~{\rm cm^2~g^{-1}}$ at $V_{\rm max }\sim10~{\rm km~s^{-1}}$, the enclosed mass of the SIDM halo within the inner $10~{\rm pc}$ can be increased by more than an order of magnitude compared to its CDM counterpart, leading to a good agreement with the properties of the GD-1 perturber. Our findings indicate that stellar streams provide a novel probe into the self-interacting nature of dark matter.
format Preprint
id arxiv_https___arxiv_org_abs_2409_19493
institution arXiv
publishDate 2024
record_format arxiv
spellingShingle The GD-1 stellar stream perturber as a core-collapsed self-interacting dark matter halo
Zhang, Xingyu
Yu, Hai-Bo
Yang, Daneng
Nadler, Ethan O.
Astrophysics of Galaxies
High Energy Physics - Phenomenology
The GD-1 stellar stream exhibits spur and gap structures that may result from a close encounter with a dense substructure. When interpreted as a dark matter subhalo, the perturber is denser than predicted in the standard cold dark matter (CDM) model. In self-interacting dark matter (SIDM), however, a halo could evolve into a phase of gravothermal collapse, resulting in a higher central density than its CDM counterpart. We conduct high-resolution controlled N-body simulations to show that a collapsed SIDM halo could account for the GD-1 perturber's high density. We model a progenitor halo with a mass of $3\times10^8~M_\odot$, motivated by a cosmological simulation of a Milky Way analog, and evolve it in the Milky Way's tidal field. For a cross section per mass of $σ/m\approx30-100~{\rm cm^2~g^{-1}}$ at $V_{\rm max }\sim10~{\rm km~s^{-1}}$, the enclosed mass of the SIDM halo within the inner $10~{\rm pc}$ can be increased by more than an order of magnitude compared to its CDM counterpart, leading to a good agreement with the properties of the GD-1 perturber. Our findings indicate that stellar streams provide a novel probe into the self-interacting nature of dark matter.
title The GD-1 stellar stream perturber as a core-collapsed self-interacting dark matter halo
topic Astrophysics of Galaxies
High Energy Physics - Phenomenology
url https://arxiv.org/abs/2409.19493