The "Little Dark Dot": Evidence for Self-interacting Dark Matter in the Strong Lens SDSS J0946+1006?
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| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866917087303172096 |
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| author | Li, Shubo Li, Ran Wang, Kaihao Jia, Zixiang Cao, Xiaoyue Frenk, Carlos S. Jiang, Fangzhou Amvrosiadis, Aristeidis Cole, Shaun He, Qiuhan Lange, Samuel C. Massey, Richard Nightingale, James W. Robertson, Andrew von Wietersheim-Kramsta, Maximilian Ma, Xianghao |
| author_facet | Li, Shubo Li, Ran Wang, Kaihao Jia, Zixiang Cao, Xiaoyue Frenk, Carlos S. Jiang, Fangzhou Amvrosiadis, Aristeidis Cole, Shaun He, Qiuhan Lange, Samuel C. Massey, Richard Nightingale, James W. Robertson, Andrew von Wietersheim-Kramsta, Maximilian Ma, Xianghao |
| contents | Previous studies, based on precise modeling of a gravitationally lensing image, have identified what may be an extremely compact, dark perturber in the well-known lensing system SDSS J0946+1006 (the "Jackpot"). Its remarkable compactness challenges the standard cold dark matter (CDM) paradigm. In this paper, we explore whether such a compact perturber could be explained as a core-collapse halo described by the self-interacting dark matter (SIDM) model. Using the isothermal Jeans method, we compute the density profiles of core-collapse halos across a range of masses. Our comparison with observations indicates that a core-collapse halo has an inner density profile and mass enclosed within 1 kpc that fit the data well, but only if the halo has a total mass $\sim10^{11}~{\rm M_{\odot}}$. While a halo of this mass should host a detectable galaxy, the current observational upper limit on the perturber's luminosity remains uncertain. Resolving whether or not the data support the presence of a core-collapse SIDM halo therefore requires future deep observations to measure its luminosity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_11800 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The "Little Dark Dot": Evidence for Self-interacting Dark Matter in the Strong Lens SDSS J0946+1006? Li, Shubo Li, Ran Wang, Kaihao Jia, Zixiang Cao, Xiaoyue Frenk, Carlos S. Jiang, Fangzhou Amvrosiadis, Aristeidis Cole, Shaun He, Qiuhan Lange, Samuel C. Massey, Richard Nightingale, James W. Robertson, Andrew von Wietersheim-Kramsta, Maximilian Ma, Xianghao Astrophysics of Galaxies Previous studies, based on precise modeling of a gravitationally lensing image, have identified what may be an extremely compact, dark perturber in the well-known lensing system SDSS J0946+1006 (the "Jackpot"). Its remarkable compactness challenges the standard cold dark matter (CDM) paradigm. In this paper, we explore whether such a compact perturber could be explained as a core-collapse halo described by the self-interacting dark matter (SIDM) model. Using the isothermal Jeans method, we compute the density profiles of core-collapse halos across a range of masses. Our comparison with observations indicates that a core-collapse halo has an inner density profile and mass enclosed within 1 kpc that fit the data well, but only if the halo has a total mass $\sim10^{11}~{\rm M_{\odot}}$. While a halo of this mass should host a detectable galaxy, the current observational upper limit on the perturber's luminosity remains uncertain. Resolving whether or not the data support the presence of a core-collapse SIDM halo therefore requires future deep observations to measure its luminosity. |
| title | The "Little Dark Dot": Evidence for Self-interacting Dark Matter in the Strong Lens SDSS J0946+1006? |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2504.11800 |