The MAGPI Survey: co-evolution of baryons and dark matter in star-forming disk-like galaxies at $0.1 \lesssim z \lesssim 0.85$
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| Format: | Preprint |
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2026
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| author | Sharma, Gauri Battisti, Andrew J. Wisnioski, Emily Mendel, J. Trevor Bellstedt, Sabine Lagos, Claudia Del P. Foster, Caroline Poci, Adriano Harborne, Katherine E. Bagge, Ryan Barsanti, Stefania Bland-Hawthorn, Joss Breda, Iris Croom, Scott M. Glazebrook, Karl Mai, Yifan Sweet, Sarah M. Thater, Sabine Valenzuela, Lucas M. van de Ven, Glenn Yi, Sukyoung Zafar, Tayyaba Ziegler, Bodo |
| author_facet | Sharma, Gauri Battisti, Andrew J. Wisnioski, Emily Mendel, J. Trevor Bellstedt, Sabine Lagos, Claudia Del P. Foster, Caroline Poci, Adriano Harborne, Katherine E. Bagge, Ryan Barsanti, Stefania Bland-Hawthorn, Joss Breda, Iris Croom, Scott M. Glazebrook, Karl Mai, Yifan Sweet, Sarah M. Thater, Sabine Valenzuela, Lucas M. van de Ven, Glenn Yi, Sukyoung Zafar, Tayyaba Ziegler, Bodo |
| contents | We present a comprehensive analysis of the dark matter (DM) content and its structural dependence in star-forming disk-like galaxies at intermediate redshifts ($0.1 \lesssim z \lesssim 0.85$), utilizing spatially resolved kinematic data from the MAGPI survey. We report the following: (1) Low stellar mass galaxies ($M_{\rm star} < 10^{9.5}\, M_\odot$) are strongly DM dominated across all radii, with average $\langle f_{_{\rm DM}} \rangle \sim 0.85$, while high-mass ($M_{\rm star} > 10^{10.5}\, M_\odot$) systems exhibit relatively low DM fractions in their inner regions ($\langle f_{_{\rm DM}} \rangle \sim 0.47$) which is equivalent to local massive disk galaxies (e.g., Milky Way and Andromeda). This suggests a mass-dependent structural dichotomy, most-likely governed by a combination of internal galactic processes and environmental influences. (2) A tight inverse correlation between $f_{_{\rm DM}}$ and baryon mass surface density ($Σ_{\rm bar}$), with intrinsic scatter of $\sim 0.11$ dex. This is consistent with an inside-out baryon assembly scenario and suggests that the fundamental structural correlations of galaxies were already established by $z\sim 0.85$. (3) No significant evolution in $f_{_{\rm DM}}$ with redshift across the MAGPI window, and when combined with higher-redshift ($0.6 \leq z \leq 1.5$) data from Sharma et al. 2025, we quantitatively show that the reported decline in $f_{_{\rm DM}}(z)$ is most-likely due to observational biases against low-mass systems at $z > 1$. These results offer empirical evidence for a scenario in which disk-like galaxies evolve through a co-regulated build-up of baryonic and DM components, preserving internal structural regularities (such as the total mass distribution and rotation-curve shape) throughout cosmic time. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_12315 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | The MAGPI Survey: co-evolution of baryons and dark matter in star-forming disk-like galaxies at $0.1 \lesssim z \lesssim 0.85$ Sharma, Gauri Battisti, Andrew J. Wisnioski, Emily Mendel, J. Trevor Bellstedt, Sabine Lagos, Claudia Del P. Foster, Caroline Poci, Adriano Harborne, Katherine E. Bagge, Ryan Barsanti, Stefania Bland-Hawthorn, Joss Breda, Iris Croom, Scott M. Glazebrook, Karl Mai, Yifan Sweet, Sarah M. Thater, Sabine Valenzuela, Lucas M. van de Ven, Glenn Yi, Sukyoung Zafar, Tayyaba Ziegler, Bodo Astrophysics of Galaxies We present a comprehensive analysis of the dark matter (DM) content and its structural dependence in star-forming disk-like galaxies at intermediate redshifts ($0.1 \lesssim z \lesssim 0.85$), utilizing spatially resolved kinematic data from the MAGPI survey. We report the following: (1) Low stellar mass galaxies ($M_{\rm star} < 10^{9.5}\, M_\odot$) are strongly DM dominated across all radii, with average $\langle f_{_{\rm DM}} \rangle \sim 0.85$, while high-mass ($M_{\rm star} > 10^{10.5}\, M_\odot$) systems exhibit relatively low DM fractions in their inner regions ($\langle f_{_{\rm DM}} \rangle \sim 0.47$) which is equivalent to local massive disk galaxies (e.g., Milky Way and Andromeda). This suggests a mass-dependent structural dichotomy, most-likely governed by a combination of internal galactic processes and environmental influences. (2) A tight inverse correlation between $f_{_{\rm DM}}$ and baryon mass surface density ($Σ_{\rm bar}$), with intrinsic scatter of $\sim 0.11$ dex. This is consistent with an inside-out baryon assembly scenario and suggests that the fundamental structural correlations of galaxies were already established by $z\sim 0.85$. (3) No significant evolution in $f_{_{\rm DM}}$ with redshift across the MAGPI window, and when combined with higher-redshift ($0.6 \leq z \leq 1.5$) data from Sharma et al. 2025, we quantitatively show that the reported decline in $f_{_{\rm DM}}(z)$ is most-likely due to observational biases against low-mass systems at $z > 1$. These results offer empirical evidence for a scenario in which disk-like galaxies evolve through a co-regulated build-up of baryonic and DM components, preserving internal structural regularities (such as the total mass distribution and rotation-curve shape) throughout cosmic time. |
| title | The MAGPI Survey: co-evolution of baryons and dark matter in star-forming disk-like galaxies at $0.1 \lesssim z \lesssim 0.85$ |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2601.12315 |