AI 中文总结
本研究利用MSA-3D巡天数据，通过JWST/NIRSpec空间分辨测量，揭示了z~1星系径向消光轮廓的多样性及其对恒星形成率测量的影响，并发现中等质量星系中尘埃分布相对均匀。
AI 中文摘要
我们展示了来自MSA-3D巡天中18个z~1处主序恒星形成星系的空间分辨尘埃消光和恒星形成测量结果，这些测量是通过JWST/NIRSpec的MSA采用狭缝步进策略，以约1千秒差距的分辨率绘制巴耳末发射线获得的。我们研究了径向消光轮廓的多样性，以及空间变化如何影响从单孔径测量推导出的消光和恒星形成率（SFR）。我们发现径向消光轮廓存在显著多样性：一些星系表现出中心峰值消光，但大多数星系表现出平坦甚至正的径向轮廓，在固定恒星质量下存在较大变化。这种多样性可能反映了由盘沉降、合并和内部过程等各种机制塑造的不同演化路径。我们检查了单孔径和积分测量可能产生的偏差，发现虽然它们可能低估或高估单个星系的消光和恒星形成率，但样本平均趋势大致保持不变，推导出的恒星形成率与恒星形成主序一致，且散布较小。从我们的样本中，我们发现恒星与星云红化比的中值f = E(B-V)_star/E(B-V)_gas为0.88，四分位距为0.51-0.96，表明即使在中等质量星系（恒星质量~10^9-10^10.5太阳质量）中，尘埃分布也相对均匀。我们的结果强调了空间分辨消光测量对于准确追踪恒星形成和理解星系在形态转变关键时期尘埃几何演化的重要性。
英文摘要
We present spatially resolved measurements of dust attenuation and star formation in 18 main-sequence star-forming galaxies at z$\sim$1 from the MSA-3D survey, obtained by mapping the Balmer emission lines at $\sim$1 kpc resolution with JWST/NIRSpec's MSA in a slit-stepping strategy. We investigate the diversity of radial attenuation profiles, and how the spatial variation affects attenuation and star formation rates (SFR) derived from single-aperture measurements. We find a notable diversity among radial attenuation profiles: some galaxies exhibit centrally peaked attenuation, but the majority exhibit flat or even positive radial profiles, with large variation at a fixed stellar mass. This diversity may reflect different evolutionary pathways shaped by various mechanisms such as disk settling, merging, and internal processes. We examine possible biases arising from single-aperture and integrated measurements and find that, while they can under- or over-estimate attenuation and SFRs for individual galaxies, the sample-averaged trends remain roughly unchanged, with the derived SFRs consistent with the star-forming main sequence, and a small scatter. From our sample, we find a median stellar-to-nebular reddening ratio f = E(B-V)$_{\rm star}$/E(B-V)$_{\rm gas}$ of 0.88 with an interquartile range of 0.51-0.96, suggesting relatively uniform dust distributions even in intermediate-mass galaxies (stellar masses $\sim 10^9$-$10^{10.5}~M_{\odot}$). Our results highlight the importance of spatially resolved attenuation measurements for accurately tracing star formation and understanding the evolving dust geometry in galaxies during a critical epoch of morphological transformation.
Comments20 pages, 11 figures, 2 tables; submitted to ApJ
