AI 中文总结
该研究对比静止帧紫外与光学波段的星系大小-质量关系，分析不同物理过程对其的影响，通过蒙特卡洛建模验证预测，打破单波段简并性，推动双波段联合测量。
AI 中文摘要
星系大小-质量关系（SMR）是用于约束构建星系结构的物理过程的关键标度关系，但它几乎总是在单一静止帧光学波段中测量，该波段的光迹是大部分老年恒星质量。静止帧近紫外波段追踪约100-500百万年的年轻星族和低金属丰度恒星，为该标度关系打开了新的恒星窗口。由于每个过程对年轻和老年恒星的光的重新分配方式不同，同一机制在两个波长范围内会使SMR的斜率和零点产生不同程度的偏移。本文综述并综合了主要物理过程对恒星形成星系和宁静星系在静止帧紫外与光学波段中SMR形态的影响。对于每个过程，我们从其基础物理、受影响的星系恒星质量、添加/移除/重新排列的光入手，将预测结果与观测和模拟结果锚定。我们通过正向蒙特卡洛建模验证了预测的印记。双波段视角打破了单波段分析无法解决的多个简并性，最显著的是小并合、干大并合和绝热膨胀之间的简并性。这些结果推动了当前及未来宽场成像巡天中静止帧紫外与光学SMR的联合测量。
英文摘要
The galaxy size-mass relation (SMR) is a key scaling relation used to constrain the physical processes that build galaxy structure, yet it is almost always measured in a single rest-frame optical band, where the light traces the bulk of the old stellar mass. Tracing younger populations with flux-weighted ages of ~100-500 Myr and low-metallicity stars, the rest-frame near-ultraviolet opens a new stellar window on this scaling relation. Because each process redistributes the light of young and old stars differently, the same mechanism shifts the slope and zero point of the SMR by different amounts in the two wavelength regimes. Here we review and synthesize the effects of main physical processes on the form of the SMR for star-forming and quiescent galaxies in the rest-UV and optical. For each process, we start from its underlying physics, the galaxy stellar masses it affects, and the light it adds/removes/rearranges, anchoring the predictions to observations and simulations. We validate the predicted imprints with forward Monte Carlo modelling. The two-wavelength view breaks several degeneracies that single-band analyses cannot, most notably between minor mergers, dry major mergers, and adiabatic expansion. These results motivate joint rest-UV and optical SMR measurements with current and upcoming wide-field imaging surveys.
Comments34 pages, 2 figures, 2 tables. Invited review to appear in the Galaxies special issue on Unveiling the Structural Properties of Galaxies Using Contemporary Wide-Field Surveys
Journal refGalaxies 2026, 14(4), 81
