标题： DEVILS/MIGHTEE/GAMA/DINGO：恒星形成率时间尺度对恒星形成率-无线电波 luminosity 相关性的影响 显示英文标题

标题： DEVILS/MIGHTEE/GAMA/DINGO: The Impact of SFR Timescales on the SFR-Radio Luminosity Correlation

摘要： 红外光度（L$_\mathrm{TIR}$）与1.4 GHz射电连续谱光度（L$_\mathrm{1.4GHz}$）之间的紧密关系已被证明对于理解不受尘埃遮蔽影响的恒星形成很有用。恒星形成星系中的红外辐射通常来自新形成的、被尘埃包裹的恒星，而射电同步加速器辐射则预计来自随后的超新星。通过利用来自深度外星系可见遗产巡天（DEVILS）和星系和质量组装（GAMA）调查的大量辅助远紫外-远红外测光数据，结合来自MeerKAT国际千兆赫级外星系探索（MIGHTEE）调查和中性气体起源深度研究（DINGO）项目的1.4 GHz观测数据，我们研究了远紫外-远红外与基于射电推导的恒星形成率（SFR）示踪剂之间的时间尺度差异的影响。我们检查了如何利用星系的SED推导出的恒星形成历史（SFH）来解释这些SFR示踪剂之间的差异，这些示踪剂对不同的时间尺度敏感。表现出增加的SFH的星系比从其1.4 GHz射电光度预测的具有系统更高的L$_\mathrm{TIR}$和SED推导的SFR。这表明后续超新星驱动的射电发射积累所需的时间不足。我们显示，沿星系的SED推导的SFH回溯到它们观测时刻前几亿年前的SFR(t)，不仅可以使SFR-L$_\mathrm{1.4GHz}$关系线性化，还能减少总体散射。SFR(t)-L$_\mathrm{1.4GHz}$的最小散射出现在200-300百万年前，这与理论预测的分散导致同步加速器发射的宇宙射线电子所需的时间尺度一致。 显示英文摘要

摘要： The tight relationship between infrared luminosity (L$_\mathrm{TIR}$) and 1.4 GHz radio continuum luminosity (L$_\mathrm{1.4GHz}$) has proven useful for understanding star formation free from dust obscuration. Infrared emission in star-forming galaxies typically arises from recently formed, dust-enshrouded stars, whereas radio synchrotron emission is expected from subsequent supernovae. By leveraging the wealth of ancillary far-ultraviolet - far-infrared photometry from the Deep Extragalactic VIsible Legacy Survey (DEVILS) and Galaxy and Mass Assembly (GAMA) surveys, combined with 1.4 GHz observations from the MeerKAT International GHz Tiered Extragalactic Exploration (MIGHTEE) survey and Deep Investigation of Neutral Gas Origins (DINGO) projects, we investigate the impact of timescale differences between far-ultraviolet - far-infrared and radio-derived star formation rate (SFR) tracers. We examine how the SED-derived star formation histories (SFH) of galaxies can be used to explain discrepancies in these SFR tracers, which are sensitive to different timescales. Galaxies exhibiting an increasing SFH have systematically higher L$_\mathrm{TIR}$ and SED-derived SFRs than predicted from their 1.4 GHz radio luminosity. This indicates that insufficient time has passed for subsequent supernovae-driven radio emission to accumulate. We show that backtracking the SFR(t) of galaxies along their SED-derived SFHs to a time several hundred megayears prior to their observed epoch will both linearise the SFR-L$_\mathrm{1.4GHz}$ relation and reduce the overall scatter. The minimum scatter in the SFR(t)-L$_\mathrm{1.4GHz}$ is reached at 200 - 300 Myr prior, consistent with theoretical predictions for the timescales required to disperse the cosmic ray electrons responsible for the synchrotron emission.