AI 中文总结
研究 z~0.3 星系的恒星族群径向趋势与质量聚集，利用 MUSE 数据和光谱合成代码推导属性并构建径向轮廓，发现年龄和金属度梯度特征，明确星系核心与外围不同的恒星形成历史及增长方式，揭示星系演化特点。
AI 中文摘要
星系从宇宙正午到如今的演化是探究早期快速形成的核球与持续增长的盘之间平衡的关键窗口。z~0.3 的时期是宇宙恒星形成峰值与主要处于静止状态的本地宇宙之间的关键过渡阶段。本文研究了 34 个 z~0.3 星系的空间分辨恒星族群，利用 MAGPI 巡天的 MUSE 积分场光谱数据立方体，通过 FADO 和 Starlight 光谱合成代码推导恒星族群属性，构建径向轮廓等。发现年龄有明显负径向梯度，恒星金属度梯度为负到平，核心区域比外围更老且金属更丰富，恒星形成历史和质量聚集曲线表明星系核心在宇宙时间的前 2 - 3Gyr 迅速形成 80%的恒星质量，而有效半径外区域形成更缓慢且持续到后期，外围主要通过长期恒星形成演化，确立了将高红移系统与本地静止星系联系起来的中心集中淬火和由内而外的增长。
英文摘要
The evolution of galaxies from cosmic noon to the present day provides a key window to probe the balance between early, rapid bulge formation and prolonged disk growth. The epoch at $z \sim 0.3$ marks a crucial transitional phase between the peak of cosmic star formation and the predominantly quiescent local Universe. In this work, we examine the spatially resolved stellar populations of 34 galaxies at $z \sim 0.3$ to quantify radial gradients in age, stellar metallicity, and star formation activity, and disentangle the distinct evolutionary pathways of inner and outer galactic components. We utilise MUSE integral-field spectroscopy data cubes from the MAGPI survey at redshifts of $0.28 < z < 0.35$. Stellar population properties are derived using the spectral synthesis codes FADO and Starlight, and radial profiles are constructed by fitting isophotal annuli to the galaxy continuum emission. We further reconstruct star formation histories and cumulative mass assembly curves for inner and outer regions. We find pronounced negative radial gradients in age and negative to flat gradients in stellar metallicity. Inner regions are systematically older and more metal-rich than their surrounding outskirts, with age differences up to 3-4 Gyr in the most massive systems. H$α$ equivalent width profiles reveal centrally suppressed specific star formation in most galaxies. Star formation histories and mass assembly curves demonstrate that galaxy cores formed $80\%$ of their stellar mass rapidly, within the first 2-3 Gyr of cosmic time; while areas outside $\mathrm{1\,R_{eff}}$ assembled more gradually and sustained star formation to later epochs. Outskirts evolve primarily through extended, secular star formation, establishing the centrally concentrated quenching and inside-out growth that link high-redshift systems to the quiescent galaxies of the local Universe.
Comments18 pages, 17 figures. Accepted for publication in A&A
