Fuzzy Dark Matter and the Impact of Core-Halo Diversity on Its Particle Mass Constraints
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866915882939187200 |
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| author | Wardana, Dafa Hayashi, Kohei Chiba, Masashi Ferreira, Elisa G. M. |
| author_facet | Wardana, Dafa Hayashi, Kohei Chiba, Masashi Ferreira, Elisa G. M. |
| contents | We investigate how diversity in the core-halo mass relation affects constraints on the fuzzy dark matter particle mass $m_ψ$ inferred from the internal kinematics of dwarf galaxies, and how these constraints are impacted by the inclusion of higher-order stellar velocity moments. Using stellar line-of-sight velocities and projected positions for eight Milky Way dwarf spheroidal galaxies, we model their dark matter halos as solitonic cores embedded within outer NFW envelopes. We apply both second- and fourth-order Jeans analyses to derive the posterior distribution of $m_ψ$. Our results show that there are two ranges of $m_ψ$ consistent with the observed kinematics: $\log_{10}(m_ψ/\mathrm{eV}) = -19.79^{+0.60}_{-0.53}$, and a narrower small-mass window $\log_{10}(m_ψ/\mathrm{eV}) = -21.82^{+0.35}_{-0.26}$, both within the 68% credible intervals. The latter becomes prominent only when core-halo diversity is taken into account, which highlights the sensitivity of the inferred fuzzy dark matter particle mass constraints to our understanding of the core-halo relation. Future observations, providing larger stellar samples and more precise kinematic measurements, will be essential for clarifying the allowed parameter space of fuzzy dark matter. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_07175 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Fuzzy Dark Matter and the Impact of Core-Halo Diversity on Its Particle Mass Constraints Wardana, Dafa Hayashi, Kohei Chiba, Masashi Ferreira, Elisa G. M. Astrophysics of Galaxies We investigate how diversity in the core-halo mass relation affects constraints on the fuzzy dark matter particle mass $m_ψ$ inferred from the internal kinematics of dwarf galaxies, and how these constraints are impacted by the inclusion of higher-order stellar velocity moments. Using stellar line-of-sight velocities and projected positions for eight Milky Way dwarf spheroidal galaxies, we model their dark matter halos as solitonic cores embedded within outer NFW envelopes. We apply both second- and fourth-order Jeans analyses to derive the posterior distribution of $m_ψ$. Our results show that there are two ranges of $m_ψ$ consistent with the observed kinematics: $\log_{10}(m_ψ/\mathrm{eV}) = -19.79^{+0.60}_{-0.53}$, and a narrower small-mass window $\log_{10}(m_ψ/\mathrm{eV}) = -21.82^{+0.35}_{-0.26}$, both within the 68% credible intervals. The latter becomes prominent only when core-halo diversity is taken into account, which highlights the sensitivity of the inferred fuzzy dark matter particle mass constraints to our understanding of the core-halo relation. Future observations, providing larger stellar samples and more precise kinematic measurements, will be essential for clarifying the allowed parameter space of fuzzy dark matter. |
| title | Fuzzy Dark Matter and the Impact of Core-Halo Diversity on Its Particle Mass Constraints |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2603.07175 |