The MAGPI Survey: Massive slow rotator population in place by $z \sim 0.3$

• DOI: 10.48550/arxiv.2406.02185
• Publication Date: 2024-06-04
• Authors: Caro Derkenne; Richard M. McDermid; Francesco D’Eugenio; Caroline Foster; Aman Khalid; K. E. Harborne; Jesse van de Sande; S. M. Croom; Claudia del P. Lagos; Sabine Bellstedt; J. Trevor Mendel; Marcie Mun; Emily Wisnioski; R. S. Bagge; Andrew Battisti; Joss Bland‐Hawthorn; Anna Ferré-Mateu; Yingjie Peng; Giulia Santucci; Sarah M. Sweet; Sabine Thater; Lucas M. Valenzuela; B. Ziegler
• Keywords: Astrophysics of Galaxies (astro-ph.GA); FOS: Physical sciences; Astrophysics - Astrophysics of Galaxies

We use the `Middle Ages Galaxy Properties with Integral field spectroscopy' (MAGPI) survey to investigate whether galaxies have evolved in distribution of their stellar angular momentum past 3-4 Gyr, as probed by observational proxy for spin, $\lambda_{R}$. 2D kinematics measure $\lambda_{R}$ along detailed photometric models estimate galaxy ellipticity. The combination these measurements quantifies kinematic classes `fast rotators' and rarer `slow rotators', which show no regular rotation line-of-sight velocity fields. compare 51 MAGPI $\log_{10} (M_{\star}/\mathrm{M}_\odot) > 10$ carefully drawn samples MaNGA local Universe, selected represent possible descendants progenitors. EAGLE simulations are used identify evolutionary pathways between two samples, explicitly accounting progenitor bias our results varied a might take epochs. find that occurrence slow rotating is unchanged ($z \sim 0.3$) 0$) suggesting massive rotator population was already place $\sim 4$ Gyr ago has not accumulated since. There hint sample having an excess high compared sample, corresponding more ordered rotation, but statistically significantly different. large-scale kinematics, quantified through parameter, at $z 0.3$ into diversity structures seen today Universe.