MAGNUS I: A MUSE-DEEP sample of early-type galaxies at intermediate redshift
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arXiv
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| Format: | Preprint |
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2025
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| author | Mozumdar, Pritom Cappellari, Michele Fassnacht, Christopher D. Treu, Tommaso |
| author_facet | Mozumdar, Pritom Cappellari, Michele Fassnacht, Christopher D. Treu, Tommaso |
| contents | We present a sample of 212 early-type galaxies (ETGs) at redshifts $0.25 < z < 0.75$. We combine deep integral-field spectroscopy from the MUSE-DEEP survey with high-resolution HST imaging to study the structure, kinematics, and stellar populations of these galaxies. We measure spatially resolved stellar kinematics and use the specific angular momentum proxy, $λ_R$, to classify galaxies into fast and slow rotators. We find a slow rotator fraction consistent with local Universe samples, suggesting little evolution in the massive ETG population since $z \sim 1$. The kinematic and photometric axes of fast rotators are generally well-aligned, similar to their local counterparts. We find that global stellar population properties, such as age, metallicity, and mass-to-light ratio ($M_*/L$), correlate strongly with the central velocity dispersion ($σ_\mathrm{e}$), following trends established for local ETGs. Slow rotators are typically more massive, have higher $σ_\mathrm{e}$, and are more metal-rich than fast rotators. Our findings indicate that the fundamental structural, kinematic, and stellar population scaling relations of massive ETGs were already in place by $z \sim 0.75$, suggesting their evolutionary pathways have remained stable over the last $\sim 7$ Gyr. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_23863 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | MAGNUS I: A MUSE-DEEP sample of early-type galaxies at intermediate redshift Mozumdar, Pritom Cappellari, Michele Fassnacht, Christopher D. Treu, Tommaso Astrophysics of Galaxies We present a sample of 212 early-type galaxies (ETGs) at redshifts $0.25 < z < 0.75$. We combine deep integral-field spectroscopy from the MUSE-DEEP survey with high-resolution HST imaging to study the structure, kinematics, and stellar populations of these galaxies. We measure spatially resolved stellar kinematics and use the specific angular momentum proxy, $λ_R$, to classify galaxies into fast and slow rotators. We find a slow rotator fraction consistent with local Universe samples, suggesting little evolution in the massive ETG population since $z \sim 1$. The kinematic and photometric axes of fast rotators are generally well-aligned, similar to their local counterparts. We find that global stellar population properties, such as age, metallicity, and mass-to-light ratio ($M_*/L$), correlate strongly with the central velocity dispersion ($σ_\mathrm{e}$), following trends established for local ETGs. Slow rotators are typically more massive, have higher $σ_\mathrm{e}$, and are more metal-rich than fast rotators. Our findings indicate that the fundamental structural, kinematic, and stellar population scaling relations of massive ETGs were already in place by $z \sim 0.75$, suggesting their evolutionary pathways have remained stable over the last $\sim 7$ Gyr. |
| title | MAGNUS I: A MUSE-DEEP sample of early-type galaxies at intermediate redshift |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2510.23863 |