LEGGOS：在2 < z < 4的亚千秒差距尺度上缺乏激波证据的惊人发现
LEGGOS: A Shocking Lack of Evidence for Shocks at sub-kiloparsec Scales at 2 < z < 4
- The Pennsylvania State University（宾夕法尼亚州立大学）
- NASA Goddard Space Flight Center（美国宇航局戈达德太空飞行中心）
- University of Maryland, Baltimore County（马里兰大学巴尔的摩分校）
- International Space Science Institute（国际空间科学研究所）
- University of Washington（华盛顿大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
利用JWST/NIRSpec积分场光谱对六个透镜星系进行系统激波搜索，通过多种诊断和MAPPINGS V模型，发现亚千秒差距尺度上缺乏激波证据，对星系演化研究具有重要意义。
AI中文摘要：
本文介绍了首次对六个引力透镜星系在2.37 < z < 3.625红移范围内的激波进行系统性搜索，使用了来自透镜与星系增长：观测子结构（LEGGOS）巡天的JWST/NIRSpec积分场光谱数据。我们采用了利用对激波敏感的静止系光学发射线Hβ、[O iii] λ5008、[O i] λ6302、Hα、[N ii] λ6585和[S ii] λλ6718、6733的通量和运动学特征的诊断方法。我们发现，在像素、团块和星系积分尺度上，LEGGOS光谱显示出极少甚至没有激波存在的证据。对于任何单个星系，图像平面像素中位于静止系光学线比诊断的激波区域内的比例小于8%，且被识别为激波的像素并未显示出连贯的空间结构。我们还利用MAPPINGS V激波模型从观测到的发射线推断激波速度，发现推断出的激波速度分布与激波主导气体所预期的分布不一致。总体而言，这些方法均未为六个LEGGOS源中的激波提供显著证据。最后，我们讨论了缺乏激波证据在宇宙正午及更早时期星系演化的更广泛背景下的意义。
英文摘要：
Here we present the first systematic search for shocks in six gravitationally lensed galaxies at 2.37 < z < 3.625 with JWST/NIRSpec integral field spectroscopy from the LEnsing and Galaxy Growth: Observing Substructures (LEGGOS) survey. We employ diagnostics that utilize the fluxes and kinematics of shock-sensitive rest-frame optical emission lines H\b{eta}, [O iii] λ5008, [O i] λ6302, Hα, [N ii] λ6585, and [S ii] λλ6718, 6733. We find that, on pixel, clump, and galaxy-integrated scales, the LEGGOS spectra show minimal if any evidence for shocks. The image plane pixels are < 8% within the shock regions of the rest-frame optical line ratio diagnostics for any individual galaxy, and the shock-identified pixels do not show a coherent spatial structure. We also leverage MAPPINGS V shock models to infer shock velocities from the observed emission lines, and find that the distributions of inferred shock velocities are inconsistent with those expected for shock-dominated gas. Altogether, none of these methods provide significant evidence for shocks in the six LEGGOS sources. We conclude by discussing the implications of the lack of evidence for shocks in the broader context of galaxy evolution at cosmic noon and earlier epochs.
