MAGPI巡天：宇宙时间尺度下恒星形成活动径向趋势的演化
The MAGPI Survey: Evolution of radial trends in star formation activity across cosmic time
AI总结：
基于MAGPI巡天数据，研究了294个星系在z~0.3时恒星形成活动的径向趋势，发现SFMS上下星系分别表现出平坦和正向梯度特征，揭示了星系由内向外熄灭及SF增强模式的宇宙学演化。
摘要：
借助甚大望远镜（VLT）上的多单元光谱探测仪（MUSE）所使用的自适应光学技术，积分场光谱学星系中世纪属性（MAGPI）巡天使我们能够在约40亿年前（$z$ ~ 0.3）这一关键时期研究空间可分辨的宇宙，模拟预测该时期星系的演化路径具有最大的多样性。我们研究了总计294个星系的恒星形成（SF）活动径向趋势及光度加权恒星年龄，将其作为偏离恒星形成主序（SFMS）的函数。我们同时使用H$α$发射和4000埃断裂（即D4000）作为恒星形成率（SFR）示踪剂，发现位于及高于SFMS的星系具有整体平坦的径向剖面，表明存在在整个星系盘内增强/调节SF的物理过程。然而，对于位于SFMS下方的星系，我们发现SF存在正梯度，表明发生了由内向外的熄灭。将我们的结果与其他红移范围的结果相结合，表明在$z$ ~ 0.3时，SFMS之上的SF星系径向趋势存在演化，即从$z$ ~ 1和$z$ ~ 0.3时的均匀增强SF，演化为$z$ ~ 0时的中心增强SF（当对很宽的质量范围取平均时）。我们还发现，与$z$ ~ 0相比，SFMS下方的星系具有更高的局部SFR，这可以用本地宇宙中存在大量熄灭的卫星星系和/或对D4000-sSFR关系设定的限制的不同处理来解释。
英文摘要：
Using adaptive optics with the Multi-Unit Spectroscopic Explorer (MUSE) on the Very Large Telescope (VLT), the Middle Ages Galaxy Properties with Integral Field Spectroscopy (MAGPI) survey allows us to study the spatially resolved Universe at a crucial time of ~4 Gyr ago ($z$ ~ 0.3) when simulations predict the greatest diversity in evolutionary pathways for galaxies. We investigate the radial trends in the star formation (SF) activity and luminosity-weighted stellar ages as a function of offset from the star-forming main sequence (SFMS) for a total of 294 galaxies. Using both H$α$ emission and the 4000 Angstrom break (i.e., D4000) as star formation rate (SFR) tracers, we find overall flat radial profiles for galaxies lying on and above the SFMS, suggestive of physical processes that enhance/regulate SF throughout the entire galaxy disc. However, for galaxies lying below the SFMS, we find positive gradients in SF suggestive of inside-out quenching. Placing our results in context with results from other redshift regimes suggests an evolution in radial trends at $z$ ~ 0.3 for SF galaxies above the SFMS, from uniformly enhanced SF at $z$ ~ 1 and $z$ ~ 0.3 to centrally enhanced SF at $z$ ~ 0 (when averaged over a wide range of mass). We also capture higher local SFRs for galaxies below the SFMS compared to that of $z$ ~ 0, which can be explained by a larger population of quenched satellites in the local Universe and/or different treatments of limitations set by the D4000-sSFR relation.
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