A dense dark matter core of the subhalo in the strong lensing system JVAS B1938+666
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arXiv
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| Autores principales: | , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866908548934402048 |
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| author | Lei, Lei Wang, Yi-Ying Li, Qiao Dong, Jiang Wang, Ze-Fan Lin, Wei-Long Shu, Yi-Ping Cao, Xiao-Yue Yang, Da-Neng Fan, Yi-Zhong |
| author_facet | Lei, Lei Wang, Yi-Ying Li, Qiao Dong, Jiang Wang, Ze-Fan Lin, Wei-Long Shu, Yi-Ping Cao, Xiao-Yue Yang, Da-Neng Fan, Yi-Zhong |
| contents | The nature of dark matter remains unknown, motivating the study of fuzzy/wave dark matter (FDM/$ψ$DM) and self-interacting dark matter (SIDM) as alternative frameworks to address small-scale discrepancies in halo profiles inferred from observations. This study presents a non-parametric reconstruction of the mass distribution of the previously-found, dark subhalo in the strong-lensing system JVAS B1938+666. Compared with the standard Navarro-Frenk-White (NFW) profile, both SIDM and $ψ$DM ($m_ψ=1.32^{+0.22}_{-0.31}\times 10^{-22} \, \rm eV$) provide significantly better fits to the resulting density profile. Moreover, the SIDM model is favored over $ψ$DM with a Bayes factor of 14.44. The reconstructed density profile features a characteristic kiloparsec-scale core ($r_c \approx 0.5 \, \rm kpc$) with central density $ρ_c \approx 2.5\times 10^{7}\, \rm M_{\odot} \, kpc^{-3} $, exhibiting remarkable consistency with the core-halo mass scaling relations observed in Local Group dwarf spheroidals. These findings offer insights that may help address the core-cusp discrepancy in $Λ$CDM substructure predictions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_07808 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A dense dark matter core of the subhalo in the strong lensing system JVAS B1938+666 Lei, Lei Wang, Yi-Ying Li, Qiao Dong, Jiang Wang, Ze-Fan Lin, Wei-Long Shu, Yi-Ping Cao, Xiao-Yue Yang, Da-Neng Fan, Yi-Zhong Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology High Energy Physics - Phenomenology The nature of dark matter remains unknown, motivating the study of fuzzy/wave dark matter (FDM/$ψ$DM) and self-interacting dark matter (SIDM) as alternative frameworks to address small-scale discrepancies in halo profiles inferred from observations. This study presents a non-parametric reconstruction of the mass distribution of the previously-found, dark subhalo in the strong-lensing system JVAS B1938+666. Compared with the standard Navarro-Frenk-White (NFW) profile, both SIDM and $ψ$DM ($m_ψ=1.32^{+0.22}_{-0.31}\times 10^{-22} \, \rm eV$) provide significantly better fits to the resulting density profile. Moreover, the SIDM model is favored over $ψ$DM with a Bayes factor of 14.44. The reconstructed density profile features a characteristic kiloparsec-scale core ($r_c \approx 0.5 \, \rm kpc$) with central density $ρ_c \approx 2.5\times 10^{7}\, \rm M_{\odot} \, kpc^{-3} $, exhibiting remarkable consistency with the core-halo mass scaling relations observed in Local Group dwarf spheroidals. These findings offer insights that may help address the core-cusp discrepancy in $Λ$CDM substructure predictions. |
| title | A dense dark matter core of the subhalo in the strong lensing system JVAS B1938+666 |
| topic | Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2509.07808 |