发表机构
Texas A&M University; Princeton University; Johns Hopkins University; Arizona State University; University of Pittsburgh（德克萨斯农工大学; 普林斯顿大学; 约翰斯·霍普金斯大学; 亚利桑那州立大学; 匹兹堡大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究利用SQuIGG$\vec{L}$E巡天数据，发现中等红移后星暴星系普遍存在大质量载荷因子的冷气体外流，且外流速度随熄灭时间递减，可能是先前星暴或活动星系核活动的遗迹，对快速熄灭起关键作用。
AI 中文摘要
尽管近期詹姆斯·韦布空间望远镜的研究强调冷气体外流是 $z\gtrsim2$ 处星系快速熄灭的重要机制，但此类基于空间光谱的样本规模仍然有限。在本工作中，我们搜索并刻画了由 Fe II $\lambda\lambda$2586,2600 和 Mg II $\lambda\lambda$2796,2803 吸收线示踪的冷气体外流，研究对象为 $0.5<z<0.9$ 范围内的后星暴星系（PSBs），这些星系可通过地面光谱观测获得。利用包含超过1300个PSB的SQuIGG$\vec{L}$E巡天数据，我们按恒星质量、（比）恒星形成率、爆发质量、爆发质量分数以及熄灭后时间进行分箱叠加光谱。在所有叠加光谱中，除包含熄灭时间超过260 Myr的星系那一箱外，其余均观测到蓝移谱线中心，表明存在外流。外流速度随熄灭后时间增加而下降，而与其他星系性质的相关性较弱。推断出的外流具有1至120的大质量载荷因子，最大速度超过其宿主星系星际介质的逃逸速度，能量和动量通量超过当前恒星形成所预期的水平。我们的结果表明，冷气体外流在中等红移PSB中普遍存在，可能是先前星暴或活动星系核活动所引发的遗迹外流。这些外流通过将气体输送到星系晕中，有潜力熄灭恒星形成，这与外流在从中等红移到高红移的快速熄灭过程中发挥重要作用的观点一致。
英文摘要
While recent James Webb Space Telescope studies have highlighted cool gas outflows as an important mechanism for rapid quenching at $z\gtrsim2$, such space-based spectroscopic samples remain limited in size. In this work, we search for and characterize cool gas outflows traced by Fe II $λλ$2586,2600 and Mg II $λλ$2796,2803 absorption in post-starburst galaxies (PSBs) at $0.5<z<0.9$, which are accessible to ground-based spectroscopy. Utilizing the SQuIGG$\vec{L}$E survey containing over 1300 PSBs, we stack spectra in bins of stellar mass, (specific) star formation rate, burst mass, burst mass fraction, and time since quenching. We observe blueshifted line centroids indicative of outflows in all stacks except the one containing galaxies that quenched more than 260 Myr ago. Outflow velocities decline with increasing time since quenching, while showing little correlation with other galaxy properties. The inferred outflows have large mass loading factors of 1 -- 120, maximum velocities above the interstellar medium escape velocities of their host galaxies, and energy and momentum fluxes exceeding those expected from the current star formation. Our results suggest that cool gas outflows are ubiquitous in intermediate-redshift PSBs and are likely relic outflows launched by previous starburst or AGN activity. These outflows have the potential to quench star formation by transporting gas into the galactic halos, consistent with outflows playing an important role in rapid quenching from intermediate to high redshift.
Comments23 pages, 18 figures. Revision re-submitted to ApJ
